Author Topic: Fluke 289 not quite sorted.  (Read 10736 times)

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Offline purpose

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Fluke 289 not quite sorted.
« on: November 17, 2017, 09:43:24 am »
Evening all.
I just took a punt on a faulty ebay 289.
Fixing what was most obvious (a broken battery connector) bore no fruit, but power was getting to it and it was drawing a steady 25mA.
There is no screen action (not booting) and I'm unable to turn it off without removing the battery, or turning off the power supply.
Nothing on the pcb appears to be getting hot and the lcd connector is properly seated.
Bit of supercap crud, but showing 3.2V when powered.
Anything sound familiar?

Any and all help warmly welcomed.

Peter

« Last Edit: November 19, 2017, 10:26:38 am by purpose »
 

Offline retiredcaps

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Re: Fluke 289 woes.
« Reply #1 on: November 17, 2017, 10:46:41 am »
Q1). Is there any alkaline leaked battery residue/corrosion on the pcb or battery terminals?

Q2). Maybe check Y1 and Y2 to make sure the clock is running.

Q3) Check to see if the MSP430 is getting vcc?

Q4) You could trying removing the supercap to see if that allows the 289 to boot?

I don't have a 28x so I don't know if 25mA is normal or not.  I do know the 28x battery life is supposed to be a minimum of 100 hours.  So if your alkaline are 2500mAH, then 25mA draw sounds correct.
 
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Offline purpose

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Re: Fluke 289 woes.
« Reply #2 on: November 17, 2017, 11:27:28 am »
Evening Sir.
A1 There is not. Pcb is in good order, apart from the previous owner scratching up the battery pads, which are now covered in solder and getting power from a psu.
A2 Both clocks running, but wandering.
A3 Pin 1 showing -0.8V... which doesn't sound right. Those pins are miniscule.
A4 I could, but have no hot air. I could butcher it though... needs replacing anyway. I'll report back on that one.

Cheers
Peter


 

Offline purpose

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Re: Fluke 289 woes.
« Reply #3 on: November 17, 2017, 11:33:35 am »
All those lovely test points and no list of pokery... sigh.
 

Offline purpose

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Re: Fluke 289 woes.
« Reply #4 on: November 17, 2017, 11:52:46 am »
Lifted the supercap... no joy.
 

Offline retiredcaps

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Re: Fluke 289 woes.
« Reply #5 on: November 17, 2017, 01:57:16 pm »
A2 Both clocks running, but wandering.
What frequency is it running at or what range?

Quote
A3 Pin 1 showing -0.8V... which doesn't sound right. Those pins are miniscule.
This a picture of a Fluke 287 from another eevblog post, but I suspect the 289 will be close or identical, but it looks like C42 connects to pin 1 of MSP 430.  You can measure the vcc at the + terminal of C42.
 

Offline retiredcaps

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Re: Fluke 289 woes.
« Reply #6 on: November 17, 2017, 02:00:13 pm »
All those lovely test points and no list of pokery... sigh.
I don't have a 28x, but maybe someone with one can kindly provide voltage readings at all these TPs for reference.  That might help narrow down which section is wrong.

Past Fluke service manuals had documented readings for each TP and a suggestions on what might be wrong if that reading was missing.

Those service manuals now are no longer made available to the general public for modern generation meters.
 

Offline purp

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Re: Fluke 289 woes.
« Reply #7 on: November 17, 2017, 10:43:38 pm »
Morning,
Second moniker, as I faffed something last night.

The MSP430... I was checking one of the other pin 1s..!! Pushing 60, my eyesight is no longer like a hawk. 3.4V is what my scope is now seeing at C42.
Frequencies are Y1 32.77k and Y2 32.76k and solid.

Cheers
Peter


 

Offline purp

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Re: Fluke 289 woes.
« Reply #8 on: November 17, 2017, 11:40:29 pm »
Would you Adam and Eve it... Turned it off and on again and it sprung into life..!! Turned itself off after a minute, but some progress.
 

Offline mzacharias

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Re: Fluke 289 woes.
« Reply #9 on: November 18, 2017, 10:36:11 am »
25 mA quiescent current is excessive - something should be getting hot, perhaps after a minute or two.
 

Offline purp

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Re: Fluke 289 woes.
« Reply #10 on: November 18, 2017, 11:02:43 am »
I believe you to be correct sir, but I can't find the culprit with the back of my finger.
When it works, it's pulling 18-20mA, but then shuts down after a minute or so, usually when menu hopping.
I'll get to the bottom of it if it kills you.
 

Offline purp

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Re: Fluke 289 woes.
« Reply #11 on: November 18, 2017, 08:15:12 pm »
On one of the rare occasions that the meter was functional, I managed to do a 'reset to factory default' and it's been on for an hour now.
Looks like this may have been a software problem.
Anyway, I'm delighted to have a meter long lusted after.
The only downside is that it makes my hands look small..!!

Thanks for chiming in gents.

peter
 

Offline retiredcaps

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Re: Fluke 289 woes.
« Reply #12 on: November 19, 2017, 07:07:51 am »
On one of the rare occasions that the meter was functional, I managed to do a 'reset to factory default' and it's been on for an hour now.
I was going to suggest that when I saw your post about it shutting down after menu hopping.  I'm glad you got it all sorted out.

I think 1.16 is the latest firmware for the 28x?  See

http://www.fluke.com/fluke/r0en/Support/Software/DMMUpgrade.htm
 

Offline purpose

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Re: Fluke 289 not quite sorted.
« Reply #13 on: November 19, 2017, 10:28:14 am »
I spoke too soon.
It was working flawlessly for around eight hours and then died on me.
My work is still ahead.

I'll not attempt flashing the beast until it's 100% stable.

peter
 

Offline Samogon

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Re: Fluke 289 not quite sorted.
« Reply #14 on: November 19, 2017, 11:09:57 am »
 Cold joint?
 

Offline purpose

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Re: Fluke 289 not quite sorted.
« Reply #15 on: November 19, 2017, 11:37:20 am »
No thanks... I just had one.

I've got a hot air gun on order and will likely go over the old girl.
Failing that, I see a professional needed.
 

Offline Yakuzza

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Re: Fluke 289 not quite sorted.
« Reply #16 on: November 26, 2017, 11:40:33 pm »
Hi all.
This is my firts post here at the forum. I did some reasearch and this thread seems to be the closest to what I’m experiencing. Here is my story.

Recently I found a broken Fluke 289 in my company and decided to take it apart and check if I can repair it. Basically, after pressing the power button it lids up for couple of seconds and turns off. Nothing on the LCD, no other action.

Just for the record, I don’t have education in electronics, just some minor hobby projects (like trying to repair a multimeter :) )

I’ve opened it and examined the PCB, but in general it was in a very good shape. No visually burned elements etc., except for the coroded supercap. I’ve found the thread on this forum about it and I thought that might be a reason for it not to work. I’ve order a new one and replace it, but nothing changed.

Here is what I measured:
1. I push the power button and the meter starts to draw current up to around 45mA in the first 4-5 seconds.
2. There is a very short blink of the power light after maybe 1-2 seconds form powering it up.
3. The power light turns off and the current draw goes down to around 25mA. There is nothing on the LCD. The current draw is steady.
4. I have to push the power button again to see that the current draw is dropping to 130 microA, but dropping slowly, which I assume is due to charging the new supercap.

In addition, which I didn’t mentioned this at the beginning, there was a bit of greenish dried fluid marks in on PCB close to Amper input (between the two left input jacks) and similar thing on the top corner of the LCD, close to the soldered wires. I’ve clean it but found no source.

The meter is probably quite old, but I don’t know how to check that. I have only the unit, no probes, no box etc. There is a date on the board: 2005.

Here are some questions to you guys:
1. Just to check if there is a warranty option, where can I find the production date, serial number, and other info needed to fill the online form for requesting repair by Fluke. I’ve read that it might have 10 years of warranty, right? Note - LCD doesn’t work.
2. Assuming the warranty is not an option, what else can I check?
3. Does the power light in an operational meter behaves in this way, that is lids up for couple of seconds and then turns off? The steady 25mA might be a sign, that everything except the LCD is fine, right?
4. How can I check the LCD itself?
5. Anybody have some readings on the test points, so I can compare them with my unit?
6. This might a silly question, but how can I attache voltage to PCB? There are those two small copper areas in the middle of the board and small holes right next to it. Are there any special probes cable that you stick the board on them or what?

I can upload pictures of any interesting parts of the multimeter.

I would really appreciate any help and tips you can give me.
Thank you all and have a nice day!
 

Offline Muttley Snickers

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Re: Fluke 289 not quite sorted.
« Reply #17 on: November 26, 2017, 11:55:53 pm »
You can forget about the warranty altogether unless you are the original purchaser and can prove that it was bought from a local authorised Fluke agent. Make sure you are using a good set of new batteries, which batteries are you currently using to power the meter ?.
One smart cookie, better make that two for good measure.
 

Offline Yakuzza

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Re: Fluke 289 not quite sorted.
« Reply #18 on: November 27, 2017, 02:50:14 am »
I’m using Alkaline Energizers with measured 1,47V per cell, with total of 8,82V.

In addition I just checked the following:
 :-/O 5. On the constant voltage setting the meter is drawing 19,6mA. I started to push other buttons to see if I get other readings and when I pressed the light button the LCD starter to glow nicely with current draw increased to 33mA. After pressing the light button again the intensity of backlight goes up and the current draw also up to 53mA.
Still, there is nothing on the LCD.
 

Offline saturation

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Re: Fluke 289 not quite sorted.
« Reply #19 on: November 27, 2017, 03:42:20 am »
Fluke will only warrant defects in factory parts or workmanship, not damage from use.  If you send it in, assuming you find serial number etc., they can reject the claim if they find it damaged from use, also you need to have bought it through an authorized reseller.  However, the cost for a repair maybe less than the cost of a new unit since its cheaper to do a board swap and a cal thereafter.

If the unit refuses to boot and the input jacks appear contaminated make sure there are no shorts on the board, or any liquid residue.  If it still won't boot, its likely toast.

You can download the Calibration manual and follow the troubleshooting procedures, but in all instances, the unit first boots before a test can be run.

The simple first thing to troubleshoot a Fluke DMM if you still choose to proceed is examine the inputs carefully for damage, and then desolder the input protection.  It cannot reliably be troubleshooted in circuit.  This section takes the brunt of most injury during an input fault.  If a fault made it past input protection, the subcircuits are more delicate and it can damage quite a bit. 

Good luck!
Best Wishes,

 Saturation
 

Offline Yakuzza

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Re: Fluke 289 not quite sorted.
« Reply #20 on: November 28, 2017, 11:37:45 pm »
@saturation
Do you mean to desolder input protection and check it piece by piece?
Assuming the input protection is fine, what else can I check and how?
If the input protection is faulty, does that mean that the board might be fried as well, or should the input protection actually protect the further elements?

I will be updating this question list from now on.
Here is a summary of my questions (slightly rephrased) and with some answers:

Q1. Just to check if there is a warranty option, where can I find the production date, serial number, and other info needed to fill the online form for requesting repair by Fluke. I’ve read that it might have 10 years of warranty, right? Note - LCD doesn’t work.

Ans: Since I’m not the original owner and I don’t have any papers to even show when and where the meter was bought, the conclusion is that the warranty is off the table.
-Q1 closed-


Q2. Assuming the warranty is not an option, what else can I check?

Q3. Does the power light in an operational meter behaves in this way, that is lids up for couple of seconds and then turns off?

Ans: I’ve just found out that according to Calibration Manual, in the “Power LED test” section: “... power button [should] lights for approximately 4 seconds, and then extinguishes”, which is what I observe in my unit. That is okay than.
-Q3 closed-


Q4. The steady 25mA current draw might be a sign, that everything except the LCD is fine, right?

Q5. How can I check the LCD itself?
Can I assume that pin 1 is ground and pin 2 is VCC, and check if get readings on the board, after disconnecting the LCD?

Here are some data I found in the Calibration Manual:
dot matrix LCD, DS1,
LCD MODULE,289,320X240,FSTN,3.5 MONO GRAPHIC,TRANSFLCTV,WHITE LED,0.22MM PITCH, Part number 2734828.

Q6: Anybody have some readings on the test points, so I can compare them with my unit?

Q7: This might be a silly question, but how can I attache voltage to PCB? There are those two small copper areas in the middle of the board and small holes right next to it. Are there any special probes cable that you stick the board on them or what?

Ans: According to Calibration Manual: “TP8 and TP10 can also be used to apply power to the PCA.” And since these two points are on the side of the board I can use crocodile connectors or something similar.
-Q7 closed-
 

Offline purpose

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Re: Fluke 289 not quite sorted.
« Reply #21 on: November 29, 2017, 07:57:26 am »
Yakuzza,
I'll be borrowing a working 289, so I'll get some readings up soonish.
Trouble is knowing from where to where one measures.

I was onto Fluke UK, asking about their 'fixed price repair' and was told £271 plus this and that.
I'll not be sending it to them.

peter
 

Offline Yakuzza

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Re: Fluke 289 not quite sorted.
« Reply #22 on: November 29, 2017, 08:13:14 am »
@purpose
Hi. I’ve assumed you managed to repair your unit, but I see you still haven’t fix the issue. Well, about the readings in test points I thought to measure in respect to ground, but maybe that is not a correct approach. Anybody?

I actually just did some readings on the LCD connector and few test pins, and then I realized that it doesn’t make sense to compare it with other unit’s readings. There is no Service Manual available for this model (as far as I tried to find one), so even if we identify differences in readings there is no reference to say what does that mean and what is broken. Don’t you agree?

Tomorrow I will try to grab a friend which owns a CAT mobile phone with infrared camera, so maybe I can have a look at the board and see if there is something suspiciously warmer than other.

The fact is that I don’t want to spend hundreds of pounds for repair of an old unit (with unknown history of usage, without all the accessories and even test leads). I will do few attempts and check what I can, with some advices from you guys, and if it does not help I will just ditch it.

I can share my readings in test points if you like, maybe we can see a pattern anyway  8)

Cheers,
Mike
 

Offline purpose

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Re: Fluke 289 not quite sorted.
« Reply #23 on: November 29, 2017, 08:55:27 am »
Yep... it's back to NFG.
I'll measure all points on the working 289 relative to the common input for starters and post the results.
I invested in a cheap FLIR TG165, in the hope of seeing something the back of my finger is missing.

peter
 

Offline purpose

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Re: Fluke 289 not quite sorted.
« Reply #24 on: November 30, 2017, 09:43:04 am »
I've got most readings from a good one... enough to know that my -2.5v rail is kaput.
All measurements taken relative to COM input, switch at VDC and 9V to the battery pads.

TP    BAD    GOOD
1    -0.81   -2.49
2     2.26    0.61
3    -0.13    2.49
4     2.26    0.61
5     2.25    0.61
6     2.24    0.61
7    -0.81   -2.49
8     8.23    6.53
9     1.16    1.11
10  -0.81   -2.49
11   0.23    0.46
12   -0.81   -2.49
13   2.22   0.438
14   -0.81   -2.49
15   2.13   0.438
16   2.11   0.437
17   2.26   0.609
18   0.98   0.68
19   2.13   0.43
20   2.13   0.43
21   2.13   0.43
22   2.13   0.43
23   2.13   0.43

28   -0.81   -2.49

30   -0.81   -2.49
31   -0.81   -2.49
32    2.26    0.61
33    2.26    0.61
 
U20, which I assume to be some sort of pwm, is chuffing along on one side at 293kHz and other side at 143kHz. Both at 97/98% duty.  How pertinent that may be, only one of you can tell me.

BTW... My new TG found the 10mA hungry component, but removing it just brought the draw to the normal 19mA and did nothing for the rails.

peter


« Last Edit: November 30, 2017, 10:27:49 am by purpose »
 

Offline Old Don

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Re: Fluke 289 not quite sorted.
« Reply #25 on: December 01, 2017, 01:02:31 am »
Purpose - if you have a can of air handy you can turn it upside down and spray the board with it. It should freeze the components and help with locating the hot chip(s). First to defrost are the hottest ones. Also, making the PCB cold can help with finding a cold solder joint. Spray sections of the PCB and turn on, when it functions every time a section is cold you've localized the problem area. A soldering iron or hot air gun to reflow should solve a bad solder joint, but not a flaky chip.
Retired - Formerly: Navy ET, University of Buffalo Electronic Tech, Field Engineer and former laptop repair business owner
 

Offline purpose

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Re: Fluke 289 not quite sorted.
« Reply #26 on: December 01, 2017, 02:43:57 am »
Thank you Sir... sound advice... No air handy but just ordered some.
 

Offline Yakuzza

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Re: Fluke 289 not quite sorted.
« Reply #27 on: December 04, 2017, 08:21:17 am »
I’ve checked voltages and compare it to @purpose readings. Most of the readings where consisten with the “good” meter. Here are some issue I’ve found:

TP  “good”  mine
...   ...        ...
8     6.53   I couldn’t locate the TP
9     1.11   ~0
10   -2.49  I couldn’t locate the TP
11   0.46   It goes from -1mV up while measuring (I've waited until -33mV and stopped measuring)
...    ...      ...

The rest of the readings are very close to the “good” meter.

I managed to check with a thermal camera that there is a region with higher temperature, but the camera was really crappy so it might be a false positive. I shall check the chip name and spec and see if it makes sense to have higher temp in there. Actually higher temp was on 4 resistor and 1 capacitor on the right side of that chip (ad8617).

I guess, I can try to trace the path from TP 9 and 11 to see if it leads to anything suspicious, but without a service manual it will be like chasing a wind. Any advice anybody?
 

Offline frenky

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Re: Fluke 289 not quite sorted.
« Reply #28 on: December 12, 2017, 06:22:19 pm »
@purpose: Is there any progress on the repair?

I have bought faulty Fluke 287 from ebay and it has very similar voltages on test points as yours.
When powered on the power led stays green for ever and on the lcd is Fluke logo. Current consumption is 42mA.
I have already removed all the MOVs and super cap. And washed it with IPA.
Next I'll check the power supply voltages on all ICs and frequencies of the oscillators.

« Last Edit: December 12, 2017, 06:39:23 pm by frenky »
 

Offline frenky

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Re: Fluke 289 not quite sorted.
« Reply #29 on: December 12, 2017, 06:29:15 pm »
The only two components heating up are main IC and Q9 with markings: 1.R





Q9:
« Last Edit: December 12, 2017, 06:41:53 pm by frenky »
 

Offline purpose

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Re: Fluke 289 not quite sorted.
« Reply #30 on: December 13, 2017, 03:06:01 am »
Hi Frenky,
No progress yet.
Mine shows nothing on the screen, so am thinking mine is failing earlier than yours in the boot process.
To the right of the battery pads is an unpopulated switch pad, marked S2 MSP RST. I'm wondering if this might be something worth exploring.

peter
 

Offline frenky

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Re: Fluke 289 not quite sorted.
« Reply #31 on: December 13, 2017, 05:45:41 pm »
I measured oscillators and there is no signal from it. Weird that power button works if it is connected to the IC with "sleeping" oscillator?

Anyway I made a list of all ICs on the meter. (Attached pdf)
It is very strange that nobody tried to reverse engineer 287/289 in the last 10 years. Or at least tried to identify all the elements on it.
This would help many with repairing their faulty units.
« Last Edit: December 13, 2017, 06:12:20 pm by frenky »
 

Offline frenky

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« Last Edit: December 13, 2017, 06:40:13 pm by frenky »
 

Offline purpose

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Re: Fluke 289 not quite sorted.
« Reply #33 on: December 13, 2017, 07:45:48 pm »
Nice digging.
When I was in touch with Fluke, they said they could help with component ident, but a bom might be out of the question.
I'll try my luck.

peter

PS I've just fired of an e-mail.
« Last Edit: December 13, 2017, 07:57:06 pm by purpose »
 

Offline frenky

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Re: Fluke 289 not quite sorted.
« Reply #34 on: December 13, 2017, 08:04:04 pm »
Great. Any info will be usefull.

I might have identified a few more elements:

1AM (sot23) 2N3904
ARB (SC70) TPS715
338 (sot23) NDS338N or BC338
A8L (sot23)  MMUN2234
2A (sot23) 2N3906
A41 (sot23) 1S2836 or OPA364
LTKH (S5) LT1615ES5-1
IL44 (sot23) perhaps BAT54S
A6W (sot23) BAS16
1R (sot23) MMBT5089
EHs (sot23) BCW66H
SS (sot23) BSS138
337 (sot23) NDS337N or BC337
R1E (sot23) LM4041EEM3-1.2
RAD (SC70-5) LM4041
5B1 (sot23) XC6106B032MR or XC9236A11CM
JY (sot23) BAV199
6B (sot23) 2N5484 or BC817-25
« Last Edit: December 13, 2017, 08:16:02 pm by frenky »
 

Offline retiredcaps

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Re: Fluke 289 not quite sorted.
« Reply #35 on: December 14, 2017, 07:04:42 am »
It is very strange that nobody tried to reverse engineer 287/289 in the last 10 years. Or at least tried to identify all the elements on it.
I suspect that most owners of the very expensive 287/289 just take advanage of the "lifetime" or minimum 10 year warranty rather than fix it themselves.

Others who come here for help usually find that something in the input protection is wrong.
 

Offline frenky

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Re: Fluke 289 not quite sorted.
« Reply #36 on: December 15, 2017, 01:00:51 am »
@retiredcaps:
Yes, that makes sense.

@purpose:
If you still have the good dmm available for inspection, could you repeat all the measurements again relative to the "- pad" instead of the COM?
I believe that "- pad" is GND for all the ICs on the board, but it is not on the same potential as COM.
And if you could do separate measurements for when dmm is powered off and on, would be really great.

I know that it would take quite some time and effort but it would be for greater good.  ;) :-DMM

« Last Edit: December 15, 2017, 01:04:52 am by frenky »
 

Offline purpose

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Re: Fluke 289 not quite sorted.
« Reply #37 on: December 15, 2017, 01:28:11 am »
I think I could arrange that, but only because you're from the land of Melania T.
 

Offline frenky

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Re: Fluke 289 not quite sorted.
« Reply #38 on: December 15, 2017, 04:25:54 am »
Thank you. :-DD

Not to downplay Melania's importance  ;D but we are a bit more proud of two guys:
Goran Dragic "The dragon"- NBA basketball player at Miami Heat; also led our basketball team to victory on EuroBasket 2017
Anže Kopitar - professional ice hockey player and captain of the Los Angeles Kings

 

Offline sacral

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Re: Fluke 289 not quite sorted.
« Reply #39 on: December 21, 2017, 05:41:53 am »
Hi Frenky,

I will reply here, maybe it will be useful for more people...
The test points are measured in ON (VCA position), on a functional Fluke 287 with the negative pole of the power supply as reference. On Off position, only a few test points have power, the other have 0 volts.
There are also a few TPs that i didn't find on the pcb and there are marked with x on the list. Of course I am to lazy to type all the values I find so I will post a picture with my note (I hope it will be clear enough)
 
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Offline frenky

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Re: Fluke 289 not quite sorted.
« Reply #40 on: December 21, 2017, 06:10:48 am »
Thank you. That is really nice of you. ;)  :-+
 

Offline frenky

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Re: Fluke 289 not quite sorted.
« Reply #41 on: December 27, 2017, 09:07:59 pm »
When I power on Fluke 287 I get this out of TX:

Code: [Select]
+jffs2_read_inode() failed

fs: Open failed, error 2
Can't load '/system/apps/clem.img': error 0

err_printf: aborting command
load /system/apps/clem.img failed... trying /system/apps/BackupClem.img

fs: Open failed, error 2
Can't load '/system/apps/BackupClem.img': error 0

err_printf: aborting command
load /system/apps/BackupClem.img failed

No network interfaces found

RedBoot(tm) bootstrap and debug environment [ROMRAM]
Non-certified release, version v2_0_74 - built 15:56:18, Sep 27 2007

Platform: Fluke Clem (ARM9)
Copyright (C) 2000, 2001, 2002, 2003, 2004 Red Hat, Inc.
Copyright (C) 2003, 2004, 2005, 2006, 2007 eCosCentric Limited

RAM: 0x00000000-0x007fb500, [0x0004dcb0-0x005d8500] available
FLASH: 0x10000000-0x107fffff, 63 x 0x20000 blocks, 4 x 0x8000 blocks
RedBoot>

Do I have to reflash firmware? Is that done over IR or with jtag?
 

Offline purpose

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Re: Fluke 289 not quite sorted.
« Reply #42 on: December 29, 2017, 03:29:09 am »
I'd imagine having to use the jtag, as our meters are kaput.
There is some info in this pdf that might help.
media.fluke.com/documents/287-289_mveng0200.pdf

peter

 

Offline frenky

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Re: Fluke 289 not quite sorted.
« Reply #43 on: December 29, 2017, 06:58:01 am »
Thank you. This document does help me understand how this dmm works a bit better.

I did some investigation around this debug console (baud rate 115200) that I have found:
(This serial console is not related with IR port, there is nothing being transmitted via IR during boot)



On TX I get error message about missing system image. So I tried to hook on with with computer but no luck.
When signal pulls RX to the ground both RX and TX go to LOW state and stay LOW until I reset dmm.

I tried adding 100k pullup resistors to both lines but that did not help.
Every time I try to send a command from PC to DMM both lines go LOW.
I have no idea why.

I have extracted Fluke's exe file and found clem_1_16.img.gz which is the missing file on my DMM. I would like to put it back on via serial port...

Quote
RedBoot allows download and execution of embedded applications via serial or Ethernet, including embedded Linux and eCos applications. It provides debug support in conjunction with GDB to allow development and debugging of embedded applications. It also provides an interactive command line interface to allow management of the Flash images, image download, RedBoot configuration, etc., accessible via serial or ethernet. For unattended or automated startup, boot scripts can be stored in Flash allowing for example loading of images from Flash, hard disk, or a TFTP server.
https://wiki.openwrt.org/doc/techref/bootloader/redboot
« Last Edit: December 29, 2017, 07:00:12 am by frenky »
 

Offline purpose

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Re: Fluke 289 not quite sorted.
« Reply #44 on: December 29, 2017, 08:49:03 am »
Frenky,
I barely know the difference between resistors and raspberries, so that's all gobbledegook to me, but I'll leave it to you young ones to get to the bottom of the software stuff.

BTW... did you get enough voltage info from sacral, or do you still need another testfest?
« Last Edit: December 29, 2017, 08:54:58 am by purpose »
 

Offline frenky

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Re: Fluke 289 not quite sorted.
« Reply #45 on: December 31, 2017, 08:34:17 pm »
Sorry for late answer...

I would still like to get voltages of this points if possible:



Thank you. :-DMM
« Last Edit: January 01, 2018, 02:29:39 am by frenky »
 

Offline Yakuzza

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Re: Fluke 289 not quite sorted.
« Reply #46 on: January 02, 2018, 02:44:45 am »
@retiredcaps
If there would be something wrong with the input protection, what would be the symptoms for the device? I would assume that the device should boot up normally, but one could not make any measurements. My unit doesn’t display anything on the LCD, but most of the voltages on test points seem to be similar to those listed by @purpose and @frenky. Can I assume that any potential issue with the input protection does not have anything to do with blank LCD?
I’ve just measured voltages as @sacral described in post #39 and below are those, for which I got different readings.

@sacral
My unit powers down after few minutes and so the voltages are changing. Maybe some of the measurements you’ve made were made after the “sleep”? I’m just asking. It is probably different because mine is broken ;)

Here are deviations from @sacral list:
TP 1: 0.005
TP 3: 4.96
TP 9: 2.28
TP 16: 2.91
TP 18: 1.81
TP 32: 3.07
TP 33: 3.07
TP 34: varies in a mV range
TP 37 0.057

How can I test the LCD? Anybody can give me some simple guiding for this task, so I could eliminate the faulty LCD, please?
 

Offline retiredcaps

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Re: Fluke 289 not quite sorted.
« Reply #47 on: January 02, 2018, 09:49:10 am »
@retiredcaps
If there would be something wrong with the input protection, what would be the symptoms for the device? I would assume that the device should boot up normally, but one could not make any measurements.
Correct.
Quote
Can I assume that any potential issue with the input protection does not have anything to do with blank LCD?
Correct.
 

Offline purpose

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Re: Fluke 289 not quite sorted.
« Reply #48 on: January 05, 2018, 12:40:42 am »
Frenky,
I'll have the meter on Friday night, until Saturday afternoon, so get your questions ready.

peter
 

Offline frenky

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Re: Fluke 289 not quite sorted.
« Reply #49 on: January 05, 2018, 05:50:36 pm »
Sorted by preference:

1. Voltages on my image a few posts up.

2. Voltages of all test points

3. Voltages of all tantalum capacitors:



All voltages measured at power down state. And power on state with dial knob on AC Voltage.
Ground reference should be - pad of battery: https://goo.gl/NT8har

Thank you in advance. ;)
« Last Edit: January 05, 2018, 05:59:38 pm by frenky »
 

Offline frenky

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Re: Fluke 289 not quite sorted.
« Reply #50 on: January 05, 2018, 09:07:31 pm »
Some research...

Fluke 287/289 are using RedBoot/eCos:
Quote
eCos and RedBoot based products showcase
Industrial and Automotive
Fluke 289 and 287 True-RMS Multimeters. Fluke's "The Most Advanced Multimeters, Ever", data logging & graphing multimeters.
https://lists.ecoscentric.com/ecos/examples.shtml

So I have been reading alot about RedBoot and found this:
Quote
Accessing RedBoot
After all connections have been made, start the serial terminal application and apply power to the board. Press Ctrl+C several times on the serial terminal until you see the RedBoot> prompt. If the kernel begins to boot, reset the board and try again (the standard timeout before booting the kernel is one second). On most versions of RedBoot, you will see either a '+' or a message from RedBoot before it boots the kernel, but some configurations have this disabled.
http://wiki.emacinc.com/wiki/Loading_Images_with_RedBoot

So the reason that I could not write to console is that I was trying to do it after the kernel has already booted.
So I'll try sending in Ctrl+C every half a second and then power up the Fluke 287. Hopefully I'll be able to access console this way...
 

Offline purpose

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Re: Fluke 289 not quite sorted.
« Reply #51 on: January 06, 2018, 11:19:25 pm »
Incoming.
 

Offline purpose

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Re: Fluke 289 not quite sorted.
« Reply #52 on: January 06, 2018, 11:30:04 pm »
9V TO PADS, IN AC V MODE, ALL READINGS RELATIVE TO NEG PAD.

TP
1   0.005
2   3.11
3   4.99
4   3.11
5   3.09
6   3.09
7   0.00
8   9.00
9   2.30
10  0.00
11  0.158
12  0.00
13  3.06
14  0.00
15  2.94
16  2.909
17  3.11
18  1.82
19  2.94
20  2.94
21  2.94
22  2.94
23  2.94

28  0.00
30  0.00
31  0.00
32  3.11
33  3.11
34  0.22

Off state showed only residual and dropping V readings.

Your pic answers.
tp3 4.99
x1  0.00
x2  0.903
x3  2.941
x4  0.910
x5  1.820

More to follow.
 
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Offline purpose

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Re: Fluke 289 not quite sorted.
« Reply #53 on: January 06, 2018, 11:35:47 pm »
Tants

61  17.55
58  1.245
56  2.493
59  20.03
62  18.79
60  8.99
57  9.00
53  8.69
51  9.00
44  4.98
32  2.50
26  2.50
20  4.98
89  8.99
80  1.82
68  1.82
79  2.94
67  2.94
68  1.82
41  2.50
42  3.11
35  3.11

Peter
 
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Offline frenky

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Re: Fluke 289 not quite sorted.
« Reply #54 on: January 07, 2018, 06:24:25 pm »
Wow thank you. You are the best! :-+

I'm sure that many (including me of course) will find your effort realy helpful while trying to fix faulty Fluke 287/289. :-DMM
« Last Edit: January 07, 2018, 06:30:37 pm by frenky »
 

Offline frenky

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Re: Fluke 289 not quite sorted.
« Reply #55 on: January 08, 2018, 01:15:23 am »
Tadaaaa:
Code: [Select]
RedBoot> ^C
RedBoot> help
Manage aliases kept in FLASH memory
   alias name [value]
Set/Query the system console baud rate
   baudrate [-b <rate>]
Manage machine caches
   cache [ON | OFF]
Display/switch console channel
   channel [<channel number>]
Compute a 32bit checksum [POSIX algorithm] for a range of memory
   cksum -b <location> -l <length>
Test clock accuracy
   clock
Display (hex dump) a range of memory
   dump -b <location> [-l <length>] [-s] [-1|-2|-4]
Execute an image - with MMU off
   exec [-w timeout] [-b <load addr> [-l <length>]]
        [-r <ramdisk addr> [-s <ramdisk length>]]
        [-c "kernel command line"] [-t <target> ] [<entry_point>]
Manage FLASH images
   fis {cmds}
Manage configuration kept in FLASH memory
   fconfig [-i] [-l] [-n] [-f] [-d] | [-d] nickname [value]
Manage Filesystem files
   fs {cmds}
Execute code at a location
   go [-w <timeout>] [-c] [-n] [entry]
Help about help?
   help [<topic>]
Display command history
   history
Set/change IP addresses
   ip_address [-b] [-l <local_ip_address>[/<mask_len>]] [-h <server_address>] [-d <dns_server_address]
Load a file
   load [-r] [-v] [-d] [-h <host>] [-p <TCP port>][-m <varies>] [-c <channel_number>]
        [-b <base_address>] <file_name>
Compare two blocks of memory
   mcmp -s <location> -d <location> -l <length> [-1|-2|-4]
Copy memory from one address to another
   mcopy -s <location> -d <location> -l <length> [-1|-2|-4]
Fill a block of memory with a pattern
   mfill -b <location> -l <length> -p <pattern> [-1|-2|-4]
Network connectivity test
   ping [-v] [-n <count>] [-l <length>] [-t <timeout>] [-r <rate>]
        [-i <IP_addr>] -h <IP_addr>
Reset the system
   reset
Display RedBoot version information
   version
Display (hex dump) a range of memory
   x -b <location> [-l <length>] [-s] [-1|-2|-4]



Correct pinout:
« Last Edit: January 08, 2018, 01:19:55 am by frenky »
 

Offline purpose

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Re: Fluke 289 not quite sorted.
« Reply #56 on: January 08, 2018, 03:10:31 am »
You're welcome Frenky.
Does Tadaaaa mean you've fixed her?
 

Offline frenky

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Re: Fluke 289 not quite sorted.
« Reply #57 on: January 08, 2018, 05:19:13 am »
You're welcome Frenky.
Does Tadaaaa mean you've fixed her?
No sadly not. But it is a progress. Next I'll try to load a data image from firmware update into flash memory.

Sent from my SM-N9005 using Tapatalk

 

Offline purpose

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Re: Fluke 289 not quite sorted.
« Reply #58 on: January 08, 2018, 05:46:59 am »
Good luck.
 

Offline frenky

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Re: Fluke 289 not quite sorted.
« Reply #59 on: January 09, 2018, 07:03:16 am »
Tnx. ;)

I'm digging trough debug console...

RedBoot> fconfig -l
Code: [Select]
Run script at boot: false
Use BOOTP for network configuration: false
Gateway IP address: 0.0.0.0
Local IP address: 192.168.9.133
Local IP address mask: 255.255.0.0
Default server IP address: 192.168.100.100
Console baud rate: 115200
DNS server IP address: 0.0.0.0
Set eth0 network hardware address [MAC]: true
eth0 network hardware address [MAC]: 0x00:0x80:0x40:0x00:0x22:0x85
GDB connection port: 9000
Force console for special debug messages: false
Network debug at boot time: false

RedBoot>fis list
Code: [Select]
Name              FLASH addr  Mem addr    Length      Entry point
RedBoot           0x10000000  0x10000000  0x00040000  0x00000000
fs                0x10040000  0x00000000  0x007A0000  0xFFFFFFFF
FIS directory     0x107E0000  0x107E0000  0x0001F000  0x00000000
RedBoot config    0x107FF000  0x107FF000  0x00001000  0x00000000

RedBoot>fs info
Code: [Select]
Filesystems available:
devfs
jffs2

Devices available:
/dev/flash/

RedBoot>fs list
Code: [Select]
fs: No filesystems mounted
RedBoot> fs mount -d /dev/flash/ -t jffs2 /hmm1
Code: [Select]
fs mount: mount(/dev/flash/,/hmm1,jffs2) failed 2
RedBoot> fs mount -d /dev/flash/ -t devfs /hmm1
RedBoot> fs info
Code: [Select]
Filesystems available:
devfs
jffs2

Devices available:
/dev/flash/

Mounted filesystems:
            Device               Filesystem Mounted on
                     /dev/flash/      devfs /hmm1

RedBoot> fs list
Code: [Select]
fs list: no such directory /
 

Offline frenky

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Re: Fluke 289 not quite sorted.
« Reply #60 on: January 10, 2018, 07:29:55 am »
So I dumped contents of "RedBoot config" and got this out:

d -b 0x107FF000 -l 0x00001000

Code: [Select]
107FF000: 00 10 00 00 CE FA AD 0B  01 0C 01 00 62 6F 6F 74  |............boot|
107FF010: 5F 73 63 72 69 70 74 00  00 00 00 00 04 11 01 0C  |_script.........|
107FF020: 62 6F 6F 74 5F 73 63 72  69 70 74 5F 64 61 74 61  |boot_script_data|
107FF030: 00 62 6F 6F 74 5F 73 63  72 69 70 74 00 66 69 73  |.boot_script.fis|
107FF040: 20 75 6E 6C 6F 63 6B 20  66 73 0A 66 73 20 6D 6F  | unlock fs.fs mo|
107FF050: 75 6E 74 20 2D 64 20 2F  64 65 76 2F 66 6C 61 73  |unt -d /dev/flas|
107FF060: 68 2F 66 69 73 2F 66 73  20 2D 74 20 6A 66 66 73  |h/fis/fs -t jffs|
107FF070: 32 20 2F 0A 6C 6F 61 64  20 2D 6D 20 66 69 6C 65  |2 /.load -m file|
107FF080: 20 2F 73 79 73 74 65 6D  2F 61 70 70 73 2F 63 6C  | /system/apps/cl|
107FF090: 65 6D 2E 69 6D 67 0A 66  73 20 75 6D 6F 75 6E 74  |em.img.fs umount|
107FF0A0: 20 2F 0A 67 6F 20 2D 63  20 2D 6E 0A 0A 00 00 00  | /.go -c -n.....|
107FF0B0: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
107FF0C0: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
107FF0D0: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
107FF0E0: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
107FF0F0: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
107FF100: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
107FF110: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
107FF120: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
107FF130: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
107FF140: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
107FF150: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
107FF160: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
107FF170: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
107FF180: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
107FF190: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
107FF1A0: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
107FF1B0: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
107FF1C0: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
107FF1D0: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
107FF1E0: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
107FF1F0: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
107FF200: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
107FF210: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
107FF220: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
107FF230: 00 00 00 00 00 00 00 00  00 00 00 00 00 02 14 01  |................|
107FF240: 0C 62 6F 6F 74 5F 73 63  72 69 70 74 5F 74 69 6D  |.boot_script_tim|
107FF250: 65 6F 75 74 00 62 6F 6F  74 5F 73 63 72 69 70 74  |eout.boot_script|
107FF260: 00 01 00 00 00 01 06 01  00 62 6F 6F 74 70 00 00  |.........bootp..|
107FF270: 00 00 00 05 14 00 06 62  6F 6F 74 70 5F 6D 79 5F  |.......bootp_my_|
107FF280: 67 61 74 65 77 61 79 5F  69 70 00 62 6F 6F 74 70  |gateway_ip.bootp|
107FF290: 00 00 00 00 00 05 0C 00  06 62 6F 6F 74 70 5F 6D  |.........bootp_m|
107FF2A0: 79 5F 69 70 00 62 6F 6F  74 70 00 C0 A8 09 85 05  |y_ip.bootp......|
107FF2B0: 11 00 06 62 6F 6F 74 70  5F 6D 79 5F 69 70 5F 6D  |...bootp_my_ip_m|
107FF2C0: 61 73 6B 00 62 6F 6F 74  70 00 FF FF 00 00 05 10  |ask.bootp.......|
107FF2D0: 01 00 62 6F 6F 74 70 5F  73 65 72 76 65 72 5F 69  |..bootp_server_i|
107FF2E0: 70 00 C0 A8 64 64 02 12  01 00 63 6F 6E 73 6F 6C  |p...dd....consol|
107FF2F0: 65 5F 62 61 75 64 5F 72  61 74 65 00 00 C2 01 00  |e_baud_rate.....|
107FF300: 05 07 01 00 64 6E 73 5F  69 70 00 00 00 00 00 01  |....dns_ip......|
107FF310: 09 01 00 65 74 68 30 5F  65 73 61 00 01 00 00 00  |...eth0_esa.....|
107FF320: 06 0E 01 09 65 74 68 30  5F 65 73 61 5F 64 61 74  |....eth0_esa_dat|
107FF330: 61 00 65 74 68 30 5F 65  73 61 00 00 80 40 00 22  |a.eth0_esa...@."|
107FF340: 85 00 00 02 09 01 00 67  64 62 5F 70 6F 72 74 00  |.......gdb_port.|
107FF350: 28 23 00 00 01 13 01 00  69 6E 66 6F 5F 63 6F 6E  |(#......info_con|
107FF360: 73 6F 6C 65 5F 66 6F 72  63 65 00 01 00 00 00 02  |sole_force......|
107FF370: 14 01 13 69 6E 66 6F 5F  63 6F 6E 73 6F 6C 65 5F  |...info_console_|
107FF380: 6E 75 6D 62 65 72 00 69  6E 66 6F 5F 63 6F 6E 73  |number.info_cons|
107FF390: 6F 6C 65 5F 66 6F 72 63  65 00 00 00 00 00 01 0A  |ole_force.......|
107FF3A0: 01 00 6E 65 74 5F 64 65  62 75 67 00 00 00 00 00  |..net_debug.....|
107FF3B0: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
107FF3C0: 00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|

Made it readable and run found commands manually:

fis unlock fs
fs mount -d /dev/flash/fis/fs -t jffs2 /
load -m file /system/apps/clem.img
fs umount /
go -c -n

Code: [Select]
RedBoot>
fis unlock fs.fs
fis unlock fs.fs
No image 'fs.fs' found
RedBoot>
fis unlock fs
fis unlock fs
RedBoot>
fs mount -d /dev/flash/fis/fs -t jffs2 /
fs mount -d /dev/flash/fis/fs -t jffs2 /
RedBoot>
load -m file /system/apps/clem.img.fs
load -m file /system/apps/clem.img.fs
fs: Open failed, error 2
Can't load '/system/apps/clem.img.fs': error 0
RedBoot>
fs list
fs list
   1 drwxr-xr-x  1 size      0 .
   1 drwxr-xr-x  1 size      0 ..
   4 drwxr-xr-x  1 size      0 tmp
   5 drwxr-xr-x  1 size      0 user
   3 drwxr-xr-x  1 size      0 system
   2 drwxr-xr-x  1 size      0 checkpoint
RedBoot>
fs list tmp
fs list tmp
   4 drwxr-xr-x  1 size      0 .
   1 drwxr-xr-x  1 size      0 ..
RedBoot>
fs list user
fs list user
   5 drwxr-xr-x  1 size      0 .
   1 drwxr-xr-x  1 size      0 ..
  10 drwxr-xr-x  1 size      0 setup
  11 drwxr-xr-x  1 size      0 stored
   9 drwxr-xr-x  1 size      0 calibration
RedBoot>
fs list system
fs list system
   3 drwxr-xr-x  1 size      0 .
   1 drwxr-xr-x  1 size      0 ..
   6 drwxr-xr-x  1 size      0 apps
   7 drwxr-xr-x  1 size      0 health
RedBoot>
fs list system/apps
fs list system/apps
   6 drwxr-xr-x  1 size      0 .
   3 drwxr-xr-x  1 size      0 ..
jffs2_read_inode() failed
Unable to stat file system/apps/clem.img

So I get the error "Unable to stat file system/apps/clem.img".
Perhaps this image is somehow corrupted?

But now I'm pretty sure that I'll be able to load image into flash via xmodem.
« Last Edit: January 10, 2018, 05:22:50 pm by frenky »
 

Offline purpose

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Re: Fluke 289 not quite sorted.
« Reply #61 on: January 10, 2018, 08:50:39 am »
 :-+
 

Offline frenky

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Re: Fluke 289 not quite sorted.
« Reply #62 on: January 18, 2018, 05:43:46 pm »
With ExtraPuTTY I was able to load clem.img into mcu's memory:

load -m xmodem
go -c -n

But When I run "go -c -n" nothing happened so I'm a bit lost here...

Anyway I went into another path of finding all jtag intefaces...

First of ARM9 MC9328MXS mcu. I overlaid pinout from datasheet on  the back of pcb to see were are jtag bga pads:



Then I measured resistance to the header on the side of pcb, to find out which signal goes where:

trst   tms   tdo   tck   tdi
e37   e36   e34   tp19   tp21



Then used jtagenum to confirm that pins are correct:

ntrst:DIG_6 tck:DIG_3 tms:DIG_5 tdo:DIG_4 tdi:DIG_2 IR length: 4

Starting scan for IDCODE...
 ntrst:DIG_6 tck:DIG_3 tms:DIG_5 tdo:DIG_4 tdi:DIG_2  devices: 1
  0x1092001D

And yes this is correct id according to this: https://github.com/MonsieurV/msk/blob/master/apf9328flash.cfg

# The CPU - mc9328mxl
set _CHIPNAME mc9328mxl
set _ENDIAN little

# There is only one TAP
set _CPUTAPID 0x1092001d
« Last Edit: January 18, 2018, 05:46:23 pm by frenky »
 

Offline Terry01

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Re: Fluke 289 not quite sorted.
« Reply #63 on: February 23, 2018, 11:37:06 pm »
Frenky.

I have just been In my new 289 to check the cap, yours looks upside down compared to mine. Please don't shout at me for being a ***** IDIOT or anything like that. I may/probably be completely wrong. I am a complete beginner electronics wise to you guys so don't know much about these things. The cap looking upside down compared to mine jumped right out at me when I saw the picture of yours.

Hope this helps....
Sparks and Smoke means i'm nearly there! 8)
 

Offline Terry01

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Re: Fluke 289 not quite sorted.
« Reply #64 on: February 23, 2018, 11:39:29 pm »
If you wait till tonight UK time I will be able to get a decent quality pic of mine and post it?
Sparks and Smoke means i'm nearly there! 8)
 

Offline frenky

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Re: Fluke 289 not quite sorted.
« Reply #65 on: February 23, 2018, 11:53:36 pm »
Yes please do take a picture.  ;)
 

Offline AnJu

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Re: Fluke 289 not quite sorted.
« Reply #66 on: March 05, 2018, 10:46:45 am »
I connected my working Fluke 287 to the debug console.
But during boot I see only: +Entry point: 0x00060040, address range: 0x00060000-0x003beba0
When I send Ctrl C Fluke 287 shutdown and I see: $T02thread:00000001;0f:24930600;0d:64fc3b00;#f8
So I can't access to the RedBoot console.
Frenky, what the firmware version on your Fluke 287?
« Last Edit: March 05, 2018, 10:53:22 am by AnJu »
 

Offline AnJu

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Re: Fluke 289 not quite sorted.
« Reply #67 on: March 07, 2018, 03:35:56 am »
I have seen, but it does not work for mine Fluke 287
I've come to the conclusion that access to the console is closed in the latest firmware 1.16
I found the old firmware version 1.1: http://www.elso.sk/media/download/sw-drv/fluke/28xUpdatePkg_V1_10.exe
But it does not allow me to make downgrade.
To bypass protection, I need to calculate (MD5?) signature in the manifest.txt or path the firmware updater Upd28X.exe

// MANIFEST SIGNATURE
!8a28a20042f8b0a4b31d041e9ccc4c18


Any ideas?
 

Offline FrankE

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Re: Fluke 289 not quite sorted.
« Reply #68 on: March 07, 2018, 05:04:56 pm »
Thank you Sir... sound advice... No air handy but just ordered some.

FFR: You can get air tins in Poundland. £1
 
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Offline frenky

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Re: Fluke 289 not quite sorted.
« Reply #69 on: March 07, 2018, 07:14:09 pm »
I do not know about firmware version, because IR is not working.
To get to console you could try sending Ctrl+C every 100ms with a script on pc or microcontroller.
That should stop loading OS and show you redboot. In my case OS load fails so I get into redboot immediately.
 

Offline AnJu

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Re: Fluke 289 not quite sorted.
« Reply #70 on: March 07, 2018, 09:24:30 pm »
Frenky, I successfully downgraded to 1.1 version but the console works the same way.  |O
What terminal program did you use to access redboot?
 

Offline frenky

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Re: Fluke 289 not quite sorted.
« Reply #71 on: March 07, 2018, 10:46:46 pm »
ExtraPuTTY. http://www.extraputty.com/
So I could upload binary file with xmodem.
 

Offline AnJu

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Re: Fluke 289 not quite sorted.
« Reply #72 on: March 08, 2018, 12:14:20 am »
Ok I will try connect with ExtraPuTTY.
Also please provide your working script too.
 

Offline frenky

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Re: Fluke 289 not quite sorted.
« Reply #73 on: March 08, 2018, 12:21:06 am »
I do not have a script.
My fluke is faulty so on boot-up sequence it tries to load OS from ROM/Flash, but it can't find it. (Corrupted memory?)
So it stays in redboot.
But I have read, that if you send Ctrl+C early during boot it will stop booting OS and show redboot console.
 

Offline AnJu

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Re: Fluke 289 not quite sorted.
« Reply #74 on: March 08, 2018, 12:23:55 pm »
Pinout J6 ENET1
1   GND
2   nCS4
3   nEB3
4   nOE

5   GND
6   nRW
7   RESET_IN
8   TIN

9   GND
10   A1
11   A2
12   A3

13   GND
14   D0
15   D1
16   D2

17   GND
18   D3
19   D4

20   GND

Pinout J7 ENET2
1   GND
2   D5
3   D5
4   D7

5   GND
6   D8
7   D9
8   D10

9   GND
10   D11
11   D12
12   D13

13   GND
14   D14
15   D15

16   GND
17   VCC
18   VCC
19   VCC
20   GND
 

Offline radistx

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Re: Fluke 289 not quite sorted.
« Reply #75 on: March 12, 2018, 01:33:08 pm »
Hi everyone!
Please help me identify this component Q2 SMD SS S.
 

Offline frenky

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Re: Fluke 289 not quite sorted.
« Reply #76 on: March 12, 2018, 05:30:16 pm »
Great. Any info will be usefull.

I might have identified a few more elements:

1AM (sot23) 2N3904
ARB (SC70) TPS715
338 (sot23) NDS338N or BC338
A8L (sot23)  MMUN2234
2A (sot23) 2N3906
A41 (sot23) 1S2836 or OPA364
LTKH (S5) LT1615ES5-1
IL44 (sot23) perhaps BAT54S
A6W (sot23) BAS16
1R (sot23) MMBT5089
EHs (sot23) BCW66H
SS (sot23) BSS138
337 (sot23) NDS337N or BC337
R1E (sot23) LM4041EEM3-1.2
RAD (SC70-5) LM4041
5B1 (sot23) XC6106B032MR or XC9236A11CM
JY (sot23) BAV199
6B (sot23) 2N5484 or BC817-25
That was my guess too.
 

Offline radistx

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Re: Fluke 289 not quite sorted.
« Reply #77 on: March 13, 2018, 04:07:08 am »
Another question. One meter was shot by high voltage I have good meter to compare to this is what I am getting on optocoupler. does anyone know what optocoupler part number is?
« Last Edit: March 13, 2018, 04:11:33 am by radistx »
 

Offline sunfire

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Re: Fluke 289 not quite sorted.
« Reply #78 on: March 15, 2018, 07:00:19 am »
I don't know the original part number for that, I used SFH 325 FA-3 (made by Osram) when I replaced one of those in my 287, works perfectly.
 

Offline Samogon

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Re: Fluke 289 not quite sorted.
« Reply #79 on: March 15, 2018, 07:17:43 am »
I thought it is opto sensors for leads position, to alarm if leads in current but meter in other position
« Last Edit: March 15, 2018, 07:19:49 am by Samogon »
 

Online coromonadalix

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Re: Fluke 289 not quite sorted.
« Reply #80 on: March 18, 2018, 12:19:06 am »
thoses white optos are the leads detection ...

@radistx  have you pull out every mov / resistor / protection inputs and checked them,  checked pcb traces layout up to the dial contacts ... ??
 

Offline AnJu

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Re: Fluke 289 not quite sorted.
« Reply #81 on: March 23, 2018, 07:49:55 pm »
+fs: Open failed, error 2
Can't load '/system/apps/clem.img': error 0
err_printf: aborting command
load /system/apps/clem.img failed... trying /system/apps/BackupClem.img
fs: Open failed, error 2
Can't load '/system/apps/BackupClem.img': error 0
err_printf: aborting command
load /system/apps/BackupClem.img failed
No network interfaces found

RedBoot(tm) bootstrap and debug environment [ROMRAM]
Non-certified release, version v2_0_74 - built 08:38:05, Jun 25 2010

Platform: Fluke Clem (ARM9)
Copyright (C) 2000, 2001, 2002, 2003, 2004 Red Hat, Inc.
Copyright (C) 2003, 2004, 2005, 2006, 2007 eCosCentric Limited

RAM: 0x00000000-0x007fb500, [0x0004dd98-0x005d8500] available
FLASH: 0x10000000-0x10ffffff, 127 x 0x20000 blocks, 4 x 0x8000 blocks
RedBoot> help
Manage aliases kept in FLASH memory
   alias name [value]
Set/Query the system console baud rate
   baudrate [-b <rate>]
Manage machine caches
   cache [ON | OFF]
Display/switch console channel
   channel [<channel number>]
Compute a 32bit checksum [POSIX algorithm] for a range of memory
   cksum -b <location> -l <length>
Test clock accuracy
   clock
Display (hex dump) a range of memory
   dump -b <location> [-l <length>] [-s] [-1|-2|-4]
Execute an image - with MMU off
   exec [-w timeout] [-b <load addr> [-l <length>]]
        [-r <ramdisk addr> [-s <ramdisk length>]]
        [-c "kernel command line"] [-t <target> ] [<entry_point>]
Manage FLASH images
   fis {cmds}
Manage configuration kept in FLASH memory
   fconfig [-i] [-l] [-n] [-f] [-d] | [-d] nickname [value]
Manage Filesystem files
   fs {cmds}
Execute code at a location
   go [-w <timeout>] [-c] [-n] [entry]
Help about help?
   help [<topic>]
Display command history
   history
Set/change IP addresses
   ip_address [-b] [-l <local_ip_address>[/<mask_len>]] [-h <server_address>] [-d <dns_server_address]
Load a file
   load [-r] [-v] [-d] [-h <host>] [-p <TCP port>][-m <varies>] [-c <channel_number>]
        [-b <base_address>] <file_name>
Compare two blocks of memory
   mcmp -s <location> -d <location> -l <length> [-1|-2|-4]
Copy memory from one address to another
   mcopy -s <location> -d <location> -l <length> [-1|-2|-4]
Fill a block of memory with a pattern
   mfill -b <location> -l <length> -p <pattern> [-1|-2|-4]
Network connectivity test
   ping [-v] [-n <count>] [-l <length>] [-t <timeout>] [-r <rate>]
        [-i <IP_addr>] -h <IP_addr>
Reset the system
   reset
Display RedBoot version information
   version
Display (hex dump) a range of memory
   x -b <location> [-l <length>] [-s] [-1|-2|-4]
 

Offline frenky

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Re: Fluke 289 not quite sorted.
« Reply #82 on: March 23, 2018, 08:12:45 pm »
You are getting the same error as I am.
Please post here any updates that might help me or others with fixing fluke 287/289. :-+
 

Offline AnJu

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Re: Fluke 289 not quite sorted.
« Reply #83 on: March 25, 2018, 11:10:43 pm »
JFFS2 image from working Fluke 287 see the attached files.
Can you extract BackupMeter.hex and clem.img from it?
« Last Edit: March 25, 2018, 11:12:39 pm by AnJu »
 

Offline nixxon

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Re: Fluke 289 not quite sorted.
« Reply #84 on: October 14, 2018, 02:56:49 am »
@retiredcaps
If there would be something wrong with the input protection, what would be the symptoms for the device? I would assume that the device should boot up normally, but one could not make any measurements. My unit doesn’t display anything on the LCD, but most of the voltages on test points seem to be similar to those listed by @purpose and @frenky. Can I assume that any potential issue with the input protection does not have anything to do with blank LCD?
I’ve just measured voltages as @sacral described in post #39 and below are those, for which I got different readings.

@sacral
My unit powers down after few minutes and so the voltages are changing. Maybe some of the measurements you’ve made were made after the “sleep”? I’m just asking. It is probably different because mine is broken ;)

Here are deviations from @sacral list:
TP 1: 0.005
TP 3: 4.96
TP 9: 2.28
TP 16: 2.91
TP 18: 1.81
TP 32: 3.07
TP 33: 3.07
TP 34: varies in a mV range
TP 37 0.057

How can I test the LCD? Anybody can give me some simple guiding for this task, so I could eliminate the faulty LCD, please?

I bought a faulty 289 yesterday. After some internet search I ended up reading through this thread.

Yakuzza: Somehow I believe I have ended up with your particular 289 multimeter with a non working LCD display (background light is good). So everything you have written in this thread about your 289 applies to the 289 I  bought yesterday.

What is new information regarding the particular 289 is that I connected it to my computer via the IR189USB rev. II interface. All readings look good in FlukeView Forms... Does this fact imply that the problem is simply regarding the LCD display hardware?

The resistance reading is a little funny, reading 25 MegaOhms initially, but after shorting the probes for a brief moment it reads ~3.7 MOhms with open probes...

I have a 5 year old NIB 287 that is barely powered up a couple of times. I am considering swapping LCD's from the 287 to the 289 to figure out if only the 289's LCD is broken. However I am reluctant to disassembling my 287 as it is in mint condition.

Is it possible to do a factory reset via the IR189USB interface cable?

Is it possible to use the RS-232 serial type command "RSM" as described here: http://uniteng.com/neildocs/facilities/Fluke289_remote_spec28X.pdf

RMP
Reset Meter Properties

Reset meter properties to their factory default state.
This is the same operation as Reset Setup under
Setup front panel soft key.
« Last Edit: October 14, 2018, 05:19:59 am by nixxon »
 

Offline retiredcaps

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Re: Fluke 289 not quite sorted.
« Reply #85 on: October 14, 2018, 08:15:45 am »
The resistance reading is a little funny, reading 25 MegaOhms initially, but after shorting the probes for a brief moment it reads ~3.7 MOhms with open probes...
So the DCV and ACV mode are accurate?  Just resistance is bad?

To confirm, with open probes you get 25M ohm?  If you short the probes, you get 3.7M ohm?
 

Offline nixxon

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Re: Fluke 289 not quite sorted.
« Reply #86 on: October 14, 2018, 09:15:36 am »
After turning the dial into resistance mode, the display shows 25 M Ohms while probes are open circuit.
Shorting the probes gives a reading of 0.15 - 0.25  0.09-0.10 Ohms
When the probes are separated again, the display doesn't return to 25 M Ohms, but shows ~3.7 M Ohms (while probes are open circuit)
« Last Edit: October 14, 2018, 09:46:27 pm by nixxon »
 

Offline retiredcaps

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Re: Fluke 289 not quite sorted.
« Reply #87 on: October 14, 2018, 03:13:00 pm »
After turning the dial into resistance mode, the display shows 25 M Ohms while probes are open circuit.

When the probes are separated again, the display doesn't return to 25 M Ohms, but shows ~3.7 M Ohms (while probes are open circuit)
The non display of 0L might indicate that one or more of your input protection circuits has been damaged.

You can measure all in circuit and see if they are good.  If not, desolder them to verify.

A MOV should measure infinite resistance.  The PTC should be around 1.1k ohm.  The fusible resistor should be around 1k ohm.
 
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Offline nixxon

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Re: Fluke 289 not quite sorted.
« Reply #88 on: October 14, 2018, 08:12:02 pm »
I forgot to mention that the VAC and VDC measurements are all good compared to my Fluke 83V.

The screenshot from the 289 FW 1.16 installer reveals the software and hardware versions.

Should I press the "Next" button and go for a 1.16 update? Maybe everything will be working again after a fresh FW install?
« Last Edit: October 15, 2018, 05:37:55 pm by nixxon »
 

Offline nixxon

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Re: Fluke 289 not quite sorted.
« Reply #89 on: October 14, 2018, 09:21:57 pm »
I performed the FW 1.16 update and all seemed well. The installer confirmed update was competed and everything seemed ok with the install.

Just after atomatic reboot of the 289 it started beeping 4 times per second.
I started FlukeView Forms, but could see no data from the DMM in FlukeView Forms anymore.

I was certain I had bricked this sick puppy for good.

I completed a firmware install again with no error messages, but there was no change in meter behavior. Just beeping. Almost the same way as when you have your probes connected the wrong way...

So - after fiddling with the rotary switch and buttons, I managed to silence the meter by setting the selector to current measurement mode (A/mA or uA), while probes are connected to the COM and V/Ohm jacks.
The data is again registered in FlukeView Forms.

While in current measurement mode, the meter is silent until I move the red probe from the V/Ohm-jack to the appropriate A jack. This behavior is opposite of what to expect.

Connecting the red lead to the mA/uA jack does not make the meter beep.

Maybe the probe position sensor logic in the A jack has failed in some way (inverted signal)?

For the first time it is now possible to turn the meter off with the soft on/off button.
« Last Edit: October 14, 2018, 11:54:26 pm by nixxon »
 

Offline nixxon

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Re: Fluke 289 not quite sorted.
« Reply #90 on: October 15, 2018, 06:31:21 am »
Suddenly the meter was beeping all the time no matter where the jacks were connected.

I cleaned some of the input areas, components Q24, Q27 and DS2 with Q-tips + IPA.

I also resoldered a corroded looking solder joint on the tiny DS2 diode between the current inputs.

Now the Current Terminal Sensing works as it should - Only beeping (4 times per second) when jack a jack is inserted in any current input and not corresponding selection on rotary selector.

Now I have to figure out why the LCD doesn't show any information.
 

Online coromonadalix

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Re: Fluke 289 not quite sorted.
« Reply #91 on: October 15, 2018, 06:53:53 am »
Is the flexible pcb foil is well inserted in the white connector or have some physical damage ?   maybe pull it out and replug it ?
 

Offline Terry01

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Re: Fluke 289 not quite sorted.
« Reply #92 on: October 15, 2018, 07:29:16 am »
Nice! That's 1 less thing to be sorted out. You'll have it up and running properly before you know it my friend.  :-+
Sparks and Smoke means i'm nearly there! 8)
 
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Offline nixxon

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Re: Fluke 289 not quite sorted.
« Reply #93 on: October 15, 2018, 08:07:27 am »
I measured oscillators/crystals  Y1 and Y2.
Y1 oscillates steadily at 32.764 kHz.
Y2 oscillates steadily at 32.766 kHz.

Y1 signal amplitude is however relatively low, only 200 mVpp (measured between ground [negative pad] and either oscillator terminals).
Y2 signal amplitude was easier to measure with an amplitude of 900 mVpp.

Does anyone know the right specs of Y1 and Y2?
« Last Edit: October 15, 2018, 05:41:00 pm by nixxon »
 

Offline nixxon

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Re: Fluke 289 not quite sorted.
« Reply #94 on: October 15, 2018, 08:13:20 am »
Is the flexible pcb foil is well inserted in the white connector or have some physical damage ?   maybe pull it out and replug it ?

I haven't noticed any PCB foil inside the meter. I will look for it and the white connector the next time I get some spare time to do more troubleshooting.
 

Online coromonadalix

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Re: Fluke 289 not quite sorted.
« Reply #95 on: October 15, 2018, 12:29:01 pm »
When the back case of the meter is removed, you see an white connector with an yellowish flexible foil who go to the front panel,  named J3 on the pcb, this is the lcd supply and data connector.

http://www.eevblog.com/forum/reviews/fluke-287-dmm-teardown-and-photos/?action=dlattach;attach=11256

OR

like this lcd picture on Ebay : https://www.ebay.co.uk/itm/U-S-A-FLUKE-289-LCD-Display-Meter-Display-Fluke-LCD-OEM-new-/262485299580


 

Offline nixxon

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Re: Fluke 289 not quite sorted.
« Reply #96 on: October 15, 2018, 02:04:49 pm »
When the back case of the meter is removed, you see an white connector with an yellowish flexible foil who go to the front panel,  named J3 on the pcb, this is the lcd supply and data connector.

http://www.eevblog.com/forum/reviews/fluke-287-dmm-teardown-and-photos/?action=dlattach;attach=11256

OR

like this lcd picture on Ebay : https://www.ebay.co.uk/itm/U-S-A-FLUKE-289-LCD-Display-Meter-Display-Fluke-LCD-OEM-new-/262485299580

The flat flex ribbon cable for the LCD display looks like new. I undo it practically every time I take the meter apart to troubleshoot. If i seat the cable while the DMM is running, I can see funny artifacts on the LCD screen. So the LCD seems to be «alive and kicking»
« Last Edit: December 02, 2018, 05:51:18 am by nixxon »
 

Offline Yakuzza

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Re: Fluke 289 not quite sorted.
« Reply #97 on: October 15, 2018, 05:16:23 pm »
@nixxon
Hello! Have you picked up the meter in Oslo? ;) I see you've went much further than I did in this attempt to rescue the poor unit. I gave up few months ago but I hope you will succeed!
Good luck!

Sent from my SM-G935F using Tapatalk

 
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Offline nixxon

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Re: Fluke 289 not quite sorted.
« Reply #98 on: October 15, 2018, 05:54:13 pm »
@nixxon
Hello! Have you picked up the meter in Oslo? ;) I see you've went much further than I did in this attempt to rescue the poor unit. I gave up few months ago but I hope you will succeed!
Good luck!

Sent from my SM-G935F using Tapatalk

Yes, I picked up the meter in Oslo three days ago. From you I guess. I suspect that the blue-green stuff that was found inside the unit is both corrosive and somewhat conductive. One of the solder pads for component DS2 was partly corroded away and made poor contact with the funny looking and somewhat transparent component DS2 with a diode-like symbol printed on the silk screen.
« Last Edit: October 16, 2018, 01:19:23 am by nixxon »
 

Offline commongrounder

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Re: Fluke 289 not quite sorted.
« Reply #99 on: October 16, 2018, 01:32:19 am »
@nixxon
Hello! Have you picked up the meter in Oslo? ;) I see you've went much further than I did in this attempt to rescue the poor unit. I gave up few months ago but I hope you will succeed!
Good luck!

Sent from my SM-G935F using Tapatalk

Yes, I picked up the meter in Oslo three days ago. From you I guess. I suspect that the blue-green stuff that was found inside the unit is both corrosive and somewhat conductive. One of the solder pads for component DS2 was partly corroded away and made poor contact with the funny looking and somewhat transparent component DS2 with a diode-like symbol printed on the silk screen.

Would DS2 be the surface mount LED light source for the lead sensors? Its position directly between the jacks would imply it works as a common source for both photosensors. Wonder if there is a reflective part in the cover to split and redirect the light in the needed directions? The lack of light due to the corroded pad on the LED could explain why the meter was confused about the current jacks lead state.
 
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Offline nixxon

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Re: Fluke 289 not quite sorted.
« Reply #100 on: October 16, 2018, 04:02:34 am »
Commongrounder: I really dont know how the «current terminal sensing» works. There are two components (Q24 and Q27) «looking» at each other across both terminal cavities. I would, with my limited electronix knowledge, assume that one side was active and the other was passive. However, both Q24 and Q27 are active components. I even dont know if the terminal sensing discriminates between the two current terminals. I will have to check it out when I get home tomorrow. For all that I know, the DS2 component may register an inserted probe jack and is able to discriminate between the two current terminals throug differently coded signals missing from either Q24 or Q27 when a jack is inserted.

If someone more experienced could share his or her thoughts about how the optical current terminal sensing works in the Fluke 287/289, I would surely be happy to read about it...
 

Offline commongrounder

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Re: Fluke 289 not quite sorted.
« Reply #101 on: October 16, 2018, 04:42:25 am »
So, I own a 289, and took a peek through the current jacks (not inclined to disassemble it at this time as I’m using it today). I can see a clear plastic prism reflector between the current jacks that appears to be part of the molded plastic jack frame. The light isn’t visible, but I have a small infrared probe which detected IR light in the jack cavities. I believe the diode is an IR LED, and the two outer devices are IR photo transistors. I was able to prove this, as well as understand the reasoning, by trying different combinations of plug insertions. The beeps are in conjunction with an on-screen warning of improper lead positioning. 1) Warning when lead(s) are inserted in current jack(s) in any mode but current measurement modes. 2) Warning when lead is not inserted into one or the other current jack in current measurement modes only. 3) Warning when plugs are inserted into *both* current jacks at the same time, in current measurement modes. Obviously, 3) is not a proper lead configuration for any purpose. This can only be discerned with two independent optical sensors.
Hope you can get the display up and running again. Best of luck.
 
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Offline nixxon

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Re: Fluke 289 not quite sorted.
« Reply #102 on: October 16, 2018, 04:59:21 am »
Aha, so the tiny guy in the middle (DS2) is the active part and the powered Q24 and Q27 are the sensors? Wow, My mind was set the other way around. The «optical» part of DS2 looks so small. But the transparent top edges of DS2 are angled 45 degrees both left and right and would transmit both ways towards both Q24 and Q27, across both cavities. Cool. Thanks!

However, I believe I measured that the voltage or resistance across DS2 changed inversely to light exposure. I guess I will have to do some more measurements while the unit is turned on.
« Last Edit: October 16, 2018, 10:24:45 am by nixxon »
 

Offline ElecSeb

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Re: Fluke 289 not quite sorted.
« Reply #103 on: October 16, 2018, 04:16:11 pm »
Q24 & Q27 = SFH 325 FA-3/4-Z - SIDELED® Silicon NPN Phototransistor in SMT SIDELED®-Package
DS01 = SMD LED (exact type unknown atm)
 
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Offline nixxon

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Re: Fluke 289 not quite sorted.
« Reply #104 on: October 17, 2018, 01:35:29 am »
(...)
In addition, which I didn’t mentioned this at the beginning, there was a bit of greenish dried fluid marks in on PCB close to Amper input (between the two left input jacks) and similar thing on the top corner of the LCD, close to the soldered wires. I’ve clean it but found no source.
(...)

Very interesting information about the LCD top corner... I will check it out next...
 

Offline nixxon

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Re: Fluke 289 not quite sorted.
« Reply #105 on: October 18, 2018, 03:06:25 am »
After turning the dial into resistance mode, the display shows 25 M Ohms while probes are open circuit.

When the probes are separated again, the display doesn't return to 25 M Ohms, but shows ~3.7 M Ohms (while probes are open circuit)
The non display of 0L might indicate that one or more of your input protection circuits has been damaged.

You can measure all in circuit and see if they are good.  If not, desolder them to verify.

A MOV should measure infinite resistance.  The PTC should be around 1.1k ohm.  The fusible resistor should be around 1k ohm.

I will have to figure out a way to identify the components that are involved in measuring resistance. I guess watching some of David L. Jones' old DMM teardown videos will be helpful.

In the meantime I used another DMM to measure the voltage output of the 289 terminals (COM and V) while the 289 was in resistance mode. Initially (while displaying 25 M Ohms) the voltage is 1.92 volts. After the terminals have been shorted momentarily the voltage increases to 2.76 volts (while displaying 3.7 M Ohms).

Does anyone have any idea what is going on, and why the voltage increase after the probes have been shorted?

I measured the blue Metal Oxide Varistors (MOV) and they did not show infinite resistance:
RV1: 17.5 M Ohm
RV2: 24.0 M Ohm (not stable)
RV3: 23.5 M Ohm (not stable)

Can they all be bad? I have read that "When MOVs degrade they become more conductive after they have been stressed by either continuous current or surge current." Source: https://iaeimagazine.org/magazine/2004/03/16/metal-oxide-varistor-degradation/

The black Positive Temperature Coefficient (PTC) thermistors were measured ok:
RT1: 1.1 k Ohm
RT2: 1.2 k Ohm


The fusible resistor R4 has a good resistance of 1.01 k Ohm

I also measured the main fuses
XAF1 ("DMM 44/100"): 0.8 Ohm
XAF2 ("DMM-11A"): 0.1 Ohm.

Is XAF1 supposed to have such a high resistance? It seems wrong.

Now I will read the Service Manual for Fluke 76 Chapter 2 Theory of operation and hopefully learn quite a few things about how this and other DMM's work...
I found it here: http://assets.fluke.com/manuals/76______smeng0000.pdf
« Last Edit: October 18, 2018, 06:41:56 am by nixxon »
 

Offline retiredcaps

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Re: Fluke 289 not quite sorted.
« Reply #106 on: October 18, 2018, 09:34:21 am »
I measured the blue Metal Oxide Varistors (MOV) and they did not show infinite resistance:
RV1: 17.5 M Ohm
RV2: 24.0 M Ohm (not stable)
RV3: 23.5 M Ohm (not stable)

Can they all be bad?

Desolder all the MOVs and re-measure them out of circuit.  With the MOVs removed, see if the meter works on resistance mode.

Verify that ACV and DCV works with the MOVs on low energy circuits (i.e. no mains, etc).

Quote
I also measured the main fuses
XAF1 ("DMM 44/100"): 0.8 Ohm
XAF2 ("DMM-11A"): 0.1 Ohm.

Is XAF1 supposed to have such a high resistance? It seems wrong.
The fuses only affect current measurement.
 
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Offline retiredcaps

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Re: Fluke 289 not quite sorted.
« Reply #107 on: October 18, 2018, 09:37:03 am »
In the meantime I used another DMM to measure the voltage output of the 289 terminals (COM and V) while the 289 was in resistance mode. Initially (while displaying 25 M Ohms) the voltage is 1.92 volts. After the terminals have been shorted momentarily the voltage increases to 2.76 volts (while displaying 3.7 M Ohms).
When the non working 289 is set to DCV, its input impedance should be around 11.11M ohm.
 

Offline nixxon

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Re: Fluke 289 not quite sorted.
« Reply #108 on: October 20, 2018, 11:35:30 pm »
In the meantime I used another DMM to measure the voltage output of the 289 terminals (COM and V) while the 289 was in resistance mode. Initially (while displaying 25 M Ohms) the voltage is 1.92 volts. After the terminals have been shorted momentarily the voltage increases to 2.76 volts (while displaying 3.7 M Ohms).
When the non working 289 is set to DCV, its input impedance should be around 11.11M ohm.

When the non working 289 is set to DCV, its input impedance is shown alternating between 11.004 or 11.005 M Ohm on my good 287 and alternating between 11.00 and 11.01 M Ohms on my good 83V. So the impedance of the non working 289 is ~0.105 M Ohm or ~105 k Ohm lower than what you suggested.

A comparison:
When my good 287 is set to DCV, its input impedance is shown as (10.982 M Ohm on the non working 289 and) alternating between 10.99 and 11.00 M Ohm on my good 83V. (and steady 11.00 M Ohm on my 87 (version 1)).

After shorting the probes on the non working 289 for a moment (open probes display 3.7 M Ohm), the reading on the 289 is lowered from 10.982 to 3.6542 M Ohms while the DUT 287 shows 2.7498 VDC. Lots of figures. Go figure...

Are you shure the imput impedance of a 287/289 in VDC mode is supposed to be 11.11 M Ohms?  (rather than 11.00 M Ohms)

The input impedance of my 83V and 87 (version1) in VDC mode are both ~11.11 M Ohms, though.
« Last Edit: October 20, 2018, 11:50:36 pm by nixxon »
 

Offline nixxon

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Re: Fluke 289 not quite sorted.
« Reply #109 on: October 21, 2018, 03:09:14 am »
The faulty 289 (while in resistance measurement mode) goes from 25 M Ohms open circuit to 3.7 M Ohm open circuit after a resistance below 3.7 M Omhs is registered. Check enclosed log graph where you se me touching both the probes firmer and firmer until measured resistance goes below 3.7 M Ohm.
« Last Edit: October 21, 2018, 03:11:50 am by nixxon »
 

Offline nixxon

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Re: Fluke 289 not quite sorted.
« Reply #110 on: October 21, 2018, 07:51:16 am »
In order to troubleshoot the 289 LCD that is not working, I am thinking about using my fully working 287's parts for troubleshooting.

I want to figure out if the LCD of the non working 289 is all right.

What is the best way to go:

1) Connecting the working 287's LCD to the non working 289 multimeter? or
2) Connecting the non working 289's LCD display to the working 287 multimeter?
« Last Edit: October 21, 2018, 08:03:10 am by nixxon »
 

Offline ElecSeb

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Re: Fluke 289 not quite sorted.
« Reply #111 on: October 21, 2018, 06:12:07 pm »
Expected non-working LCD to Working DMM.
This way when it works you know for sure the LCD works.

Other way around when good LCD attached to defect DMM, you know screen from new unit is good, but if it does not work, you know the Mainboard of the defect DMM is broken. But till that moment you still do not know if the suspected LCD is broken.

My 2 cents
 
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Offline nixxon

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Re: Fluke 289 not quite sorted.
« Reply #112 on: October 22, 2018, 01:08:15 am »
Expected non-working LCD to Working DMM.
This way when it works you know for sure the LCD works.

Other way around when good LCD attached to defect DMM, you know screen from new unit is good, but if it does not work, you know the Mainboard of the defect DMM is broken. But till that moment you still do not know if the suspected LCD is broken.

My 2 cents

I did as you suggested. The LCD from the 289 woke up fine when connected to my good DMM (287).

It seems that the LCD driver circuit on the 289 is no good. I noticed that one of the crystals had a low amplitude (200 mVpp) the way I measured it. According to the Fluke 27 Service Manual a similar 32.768 kHz crystal should measure 600 mVpp or more.:

  • 4. Connect either an oscilloscope or frequency counter, using a low-capacitance probe,
    to pin 54 of U1 or to the junction of C17 and Y1 (the crystal). A 32.768 kHz sine
    wave with an amplitude of approximately 600 mV peak-to-peak should be present at
    the junction of C17 and Y1 (3 V peak-to-peak at U1 pin 54). Note that U2 and the
    display will not operate if the clock signal is not present. If the clock signal is not
    present, the most likely causes are U1, Y1 or C17.

Can a missing (or low) clock signal be a part of the LCD problem when the rest of the meter seems to be working ok?
 

Offline ElecSeb

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Re: Fluke 289 not quite sorted.
« Reply #113 on: October 22, 2018, 03:37:11 am »
At this moment I do not have a scope available (bought a new one recently and is still in transit).
However did you measure your power lines?

And how do you know that the unit powers-on (sorry if I missed it in your posts).
 

Offline nixxon

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Re: Fluke 289 not quite sorted.
« Reply #114 on: October 22, 2018, 05:09:00 am »
At this moment I do not have a scope available (bought a new one recently and is still in transit).
However did you measure your power lines?

And how do you know that the unit powers-on (sorry if I missed it in your posts).

Hello. Good luck with your new scope. Are you planning to use it to do measurements on a working 287/289?

I have not measured power lines. I  bought the 289 as non working.

I have fixed one fault in the current terminal sensing and updated the firmware from v1.10 to v1.16.

I can read the 289's "screen" via the IR189USB interface on my computer using FlukeView Forms.

Now I am trying to fix it's LCD driving circuit (LCD itself is working) and the resistance measurement function not reaching "OL" while probes are open circuit.
« Last Edit: October 22, 2018, 05:41:43 am by nixxon »
 

Offline ElecSeb

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Re: Fluke 289 not quite sorted.
« Reply #115 on: October 22, 2018, 03:27:20 pm »
This means the green light from the power button is "ON"?
And concerning SCOPE -> I will measure, but I do not have a working unit.
 

Offline Samogon

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Re: Fluke 289 not quite sorted.
« Reply #116 on: October 22, 2018, 06:57:40 pm »
OL on open corcuit is ok.
 

Offline nixxon

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Re: Fluke 289 not quite sorted.
« Reply #117 on: October 22, 2018, 08:02:25 pm »
OL on open corcuit is ok.

The meter never displays "OL" in resistance measuring mode. After selecting resistance mode on the rotary switch the DMM displays 25 Mohms initially wile open circuit. If I measure anything with a resistance lower than 3.7 Mohm, the open circuit resistance is displayed as ~3.7 Mohm.

The DMM is latched to ~3.7 Mohm max. (while open circuit) until the rotary switch is rotated to some other mode and then back to resistance mode. Then the DMM indicates 25 Mohm again open circuit.

ElecSeb: Yes, the power button shows a green light for a few seconds while the DMM is booting. Just like a fully functional 287/289.
« Last Edit: October 22, 2018, 09:28:28 pm by nixxon »
 

Offline nixxon

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Re: Fluke 289 not quite sorted.
« Reply #118 on: October 23, 2018, 09:25:29 am »
Today I was troubleshooting the Y1 crystal with the low amplitude signal, still 200mVpp. The input position sensors were however acting up again, beeping all the time. I managed to silence the beeps if I put a piece of paper or a piece of tape along the optical path. It is almost like the transmitter in the middle was transmitting at a wrong angle and that the piece of paper reflected the IR light back onto the receivers.

The Y1 frequency was all over the place, varying between 32.667 and 32.720 kHz (using short gate time on the frequency counter due to significant frequency variations)
The Y2 crystal was pretty steady and varied only between 32.7660 and 32.7661 kHz (longer gate time  possible with the stable frequency).

The green light is not lighting up any more during booting, and there is no relay clicking during the boot. (Normally there is a relay click as the green light turns on, and another click as the green light turns off)

In other words, there were quite a few setbacks today.   :(
 

Offline ElecSeb

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Re: Fluke 289 not quite sorted.
« Reply #119 on: October 23, 2018, 07:24:52 pm »
Well, start with "off-state" and measure all V on the defined testpoint +-33 TP.

My fluke 289 is turning the greenled on for a short moment, then turns-off, but no screen.
Also no power from the torex PWM IC.
But unfortunately I do not have a lot of time during the day to test mine. I will try this afternoon.

I have created a XLS with all TP and reference values found in this thread (ON & OFF).
Furthermore I have created a second tab with all components I have identified so far. On mine I have tested all SOT32 elements (which are all OK).
I need to add this test data to this XLS before upload.
And last I have added a link to the specific component (I do not guarantee it is 100% correct, but I think it will come close, but any addition later on will be great!).

Only thing I am missing at the moment is a comprehensive TP layout. IN earlier posts some mention TP which are unknown to me (cannot find them visueally and in Calibration manual they are also not mentioned).

Hope to add this info to this topic soon.
 

Offline ElecSeb

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Re: Fluke 289 not quite sorted.
« Reply #120 on: October 24, 2018, 03:49:10 am »
Update from my side:
This afternoon I have finished my analysis from all SOT23 elements. All seem to be fine.
However last time I was playing with it I massively f&ckedup and created a shortage on U20. This now results in having a short between L1 and ground  |O
Initially the unit did not work and I broke L1 coil, burned 2 capacitors and removed the super-cap. Also removed burned C27 and C36 (hot air destroyed them)
The issue with my unit is, that when I turn it on, I see a green led for lets say 2 seconds, no screen and no power (unit is really off). Therefore I have checked all SOT23 elements.
I have looked-up up almost all data-sheets to see which IC's are used and next is to figure out why some voltage lines are not comparable with a post earlier in this threat.

Luckily I recently purchased a toneohm 850. 1 problem, I never ever used such a device, so I need to figure out how to trace to the broken component.
I already removed CR9, C79 and C67 (randomly -> goose-chase). But I need to do this more structured -> Toneohm.

I have some questions for here on the board already:
1. What are these components (ideally with link to a data-sheet):
Q12, Q13 -> Code 337 -> FDN337N -> N-Channel Enhanced Mosfet + body diode -> Cannot find any data-sheet
Q20, Q21, Q43 -> Code 338 -> NDS338N -> P-Channel Enhanced Mosfet + body diode -> Cannot find any data-sheet
U11 -> Code S08H -> No Idea (AND port????)

2. What is the difference between VR05 and U04 (why is one name with a "U" and the other "VR"):
VR05 ->Code 8H -> MMBZ5233BLT1G -> Zener Voltage Regulators 225 mW SOT−23 Surface Mount
U04 -> Code R1E -> LM4041 -> LM4041-N-xx Precision Micropower Shunt Voltage Reference

3. Is this part a correct replacement for the white capacitors (high precision) -> C27 and C36
Code 223 KZS -> Kemet SMC F125PP223J100
(Original part is in PL housing, but that seems not for sale, however size is then upgraded to PP, SMC series, 223 matches. However KZ is still unknown in code name) -> Any help would be highly appreciated!

@Nixxon:
If your unit is not doing anything anymore, check if U17 is actually giving juice (even when powered off.
U17 =  Code PCYI -> TPS770 -> Power 5V   ULTRALOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS

Tomorrow I will try to find my shortage with my toneohm and once fixed I will dig into this unit a little further.



 

Offline ElecSeb

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Re: Fluke 289 not quite sorted.
« Reply #121 on: October 24, 2018, 11:57:59 pm »
3. Is this part a correct replacement for the white capacitors (high precision) -> C27 and C36
Code 223 KZS -> Kemet SMC F125PP223J100
(Original part is in PL housing, but that seems not for sale, however size is then upgraded to PP, SMC series, 223 matches. However KZ is still unknown in code name) -> Any help would be highly appreciated!

Update from Kemet concerning KZS:
Please find below the explanation about the marking for our SMC series:

  • 223 is the tolerance code for 0.022uF
  • K is the capacitance tolerance code – +/-10%, but as per our catalog we not manufacture only +/-5%, +/-2.5%, +/-2%,
  • Z is the code for the voltage means 50VDC
  • S stands for SMC

I suppose that the correct PN would be SMC5.7223(1)50J33(2)
Where:
  • 1=J (5% -> which is the only one on Farnell)
  • 2=Just packaging -> not important for ordering

SMC5.7223J50J33


« Last Edit: October 25, 2018, 12:01:39 am by ElecSeb »
 

Offline ElecSeb

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Re: Fluke 289 not quite sorted.
« Reply #122 on: October 27, 2018, 05:51:37 pm »
@Nixxon any progress?
 

Offline nixxon

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Re: Fluke 289 not quite sorted.
« Reply #123 on: October 28, 2018, 06:39:35 am »
@Nixxon any progress?

Not yet. I am figuring out how stuff works by studying the Fluke 27 Service Manual. That manual includes schematic diagrams as well.

I am also studying how graphical LCDs work, possibly gaining useful knowledge by reading links like:
https://www.microcontroller-project.com/128x64-graphical-lcd.html this one has a 20-pin connector as does the 287/289 320X240 pixel LCD display. I wonder how similar the pinout is.

And why do some graphical LCD's, like the Nokia 84x84 pixel displays, only need 8 pin connectors to work? I will have to read more about this stuff. This could be a start: https://learn.sparkfun.com/tutorials/graphic-lcd-hookup-guide/all

It looks like the LCD flat flex connector traces lead go to the area close to the PCB flip side MC9328MXS chip that includes an LCD controller. I guess I have to study the pinout and do some measurements.
https://www.nxp.com/docs/en/data-sheet/MC9328MXS.pdf

The i.MX Family of applications processors provides a
leap in performance with an ARM9™ microprocessor
core and highly integrated system functions. The i.MX
family specifically addresses the requirements of the
personal, portable product market by providing
intelligent integrated peripherals, an advanced processor
core, and power management capabilities.
The MC9328MXS (i.MXS) processor features the
advanced and power-efficient ARM920T™ core that
operates at speeds up to 100 MHz. Integrated modules,
which include a USB device and an LCD controller,
support a suite of peripherals to enhance portable
products. It is packaged in a 225-contact MAPBGA
package
« Last Edit: October 28, 2018, 08:01:16 am by nixxon »
 

Offline ElecSeb

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Re: Fluke 289 not quite sorted.
« Reply #124 on: October 28, 2018, 06:41:30 pm »
Since I am not that far with my unit I cannot do this (yet).
But why not using your (scope) and test the signals from the connector and sees what comes up?

Furthermore, some posts earlier you mentioned that your device did not power on anymore. Got it fixed?
 

Offline nixxon

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Re: Fluke 289 not quite sorted.
« Reply #125 on: October 28, 2018, 07:45:52 pm »
Since I am not that far with my unit I cannot do this (yet).
But why not using your (scope) and test the signals from the connector and sees what comes up?

Furthermore, some posts earlier you mentioned that your device did not power on anymore. Got it fixed?

For some reason I would like to know what to expect before probing the LCD circuit.

My 289 has been powering on all the time. However there is no longer a green light while booting anymore. It seems to be a correlation between the current jack sensing circuit acting up and the green startup light not working.
« Last Edit: October 28, 2018, 10:26:14 pm by nixxon »
 

Offline say

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Re: Fluke 289 not quite sorted.
« Reply #126 on: December 04, 2018, 07:56:35 pm »
I ran into a Fluke 289 that was working perfectly except some problem in the lcd display. Initially the display showed black vertical lines. Typically this happens when flat flex cable glue detaches from the LCD display.

I disassembled the display and heated the flat flex and applied some pressure. The black vertical lines disappeared but then I realized that there was another problem too. The display also had evenly spaced vertical lines of missing pixels. Repeated application of heat and pressure didn't resolve this issue. I concluded that one of the 20 pins has developed some sort of bad connection on the main board. Here are before and after heat/pressure treatment pics of the display.



« Last Edit: December 05, 2018, 05:57:50 am by say »
 

Offline Terry01

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Re: Fluke 289 not quite sorted.
« Reply #127 on: December 04, 2018, 08:40:47 pm »
There's a guy on Ebay somewhere in the US who sells lots of genuine Fluke parts. I haven't seen him selling flat cables or components or things like that. He sells more cases, screens and buttons things like that. He does sell some LCD's though so maybe he would be able to source the cable you need if you messaged him? Worth a shot if it gets your meter running again?
Sparks and Smoke means i'm nearly there! 8)
 

Offline say

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Re: Fluke 289 not quite sorted.
« Reply #128 on: December 05, 2018, 05:53:56 am »
Thanks Terry01. I'm not skilled enough to change the flat flex cable on the LCD display. May be a replacement LCD would be a better choice if I could find a cheap one ;).

Sent from my SAMSUNG-SM-N920A using Tapatalk
« Last Edit: December 05, 2018, 05:59:21 am by say »
 

Offline Terry01

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Re: Fluke 289 not quite sorted.
« Reply #129 on: December 05, 2018, 08:37:15 am »
No prob. The guy has normal LCD displays for sale for around £35 for other Fluke modals but I take it the 289's screen will be more expensive? You could shoot him a mail. No harm in asking and if it gets you a working 289 it'll be worth spending a little ££'s on it. If it turns out he can't get you 1 or it's too expensive you won't have lost nothing asking right? Here's his Ebay site. Good luck buddy!

http://www.ebay.co.uk/usr/fluke-usa?_trksid=p2053788.m1543.l2754
Sparks and Smoke means i'm nearly there! 8)
 

Offline dacman

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Re: Fluke 289 not quite sorted.
« Reply #130 on: December 05, 2018, 09:33:16 am »
Have you asked Fluke if the meter is under warranty?  Some 289's have a limited lifetime warranty.
 

Offline say

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Re: Fluke 289 not quite sorted.
« Reply #131 on: December 18, 2018, 06:59:55 am »
No prob. The guy has normal LCD displays for sale for around £35 for other Fluke modals but I take it the 289's screen will be more expensive? You could shoot him a mail. No harm in asking and if it gets you a working 289 it'll be worth spending a little ££'s on it. If it turns out he can't get you 1 or it's too expensive you won't have lost nothing asking right? Here's his Ebay site. Good luck buddy!

http://www.ebay.co.uk/usr/fluke-usa?_trksid=p2053788.m1543.l2754
It didn't work out.


« Last Edit: December 18, 2018, 07:03:08 am by say »
 

Offline say

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Re: Fluke 289 not quite sorted.
« Reply #132 on: December 18, 2018, 07:02:35 am »
Have you asked Fluke if the meter is under warranty?  Some 289's have a limited lifetime warranty.
It also didn't work out.


 

Offline Terry01

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Re: Fluke 289 not quite sorted.
« Reply #133 on: December 18, 2018, 08:43:22 am »
Where in the world are you? You might live near or within reasonable posting distance of one of the more experienced members who could replace the flex for you no probs if that turns out to be the problem on your meter. I am sure if you get the flex which may or may not be too expensive someone here on the site would fit it for you. The guys here are very helpful to those of us who are not so experienced. Worth a shot if the flex turns out to be cheap and easy to get.

Just another idea?  :-\
Sparks and Smoke means i'm nearly there! 8)
 

Online coromonadalix

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Re: Fluke 289 not quite sorted.
« Reply #134 on: December 18, 2018, 10:36:43 am »
The 289 lcd   
https://www.ebay.com/itm/U-S-A-FLUKE-289-LCD-Display-Meter-Display-Fluke-LCD-OEM-new-/262485299580


You see the picture,  the lcd flex can't be changed  unless mistaken


And the Aliexpres suckers sell it way higher  :wtf:
 

Offline say

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Re: Fluke 289 not quite sorted.
« Reply #135 on: December 26, 2018, 09:56:25 am »
As if the LCD problem wasn't enough, the meter died today for no apparent reason. Now when I push the power button, the green LED (power button) blinks five times, pauses and then the cycle repeats itself. Every few cycles the LCD also flickers momentarily as if the meter is trying to reboot but fails. Removing the LCD doesn't alter the cycle. Removing the supercap also didn't help. The problem is similar to a failed/leaking capacitor but I don't know which one. The only way I can stop the power button from blinking is by removing the batteries.


 

Offline Terry01

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Re: Fluke 289 not quite sorted.
« Reply #136 on: December 26, 2018, 10:19:58 am »
Sounds like you need the help of someone who really knows their way around the 289  :(
Sparks and Smoke means i'm nearly there! 8)
 

Offline say

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Re: Fluke 289 not quite sorted.
« Reply #137 on: December 26, 2018, 10:25:34 am »
Sounds like you need the help of someone who really knows their way around the 289  :(
Thanks Terry01. I'm sure someone will step forward to help;)
 

Offline Terry01

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Re: Fluke 289 not quite sorted.
« Reply #138 on: December 26, 2018, 10:50:21 am »
Sounds like you need the help of someone who really knows their way around the 289  :(
Thanks Terry01. I'm sure someone will step forward to help;)


I'm sure they will. There are a lot of very knowledgeable people on the forum and they are usually keen to help where they can. That's the thing with these meters, they are awesome bits of kit but when they break down or whatever it can take a genius to sort them. I've seen the guys help fix loads of things from just a picture or a description of the problem!

Hope you get it sorted buddy! I love mine!
Sparks and Smoke means i'm nearly there! 8)
 

Offline say

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Re: Fluke 289 not quite sorted.
« Reply #139 on: January 01, 2019, 11:45:51 am »



Only thing I am missing at the moment is a comprehensive TP layout. IN earlier posts some mention TP which are unknown to me (cannot find them visueally and in Calibration manual they are also not mentioned).

Hope to add this info to this topic soon.

This might help :)
 

Offline say

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Re: Fluke 289 not quite sorted.
« Reply #140 on: January 01, 2019, 12:05:17 pm »
I have also tried to identify some of the voltage supply ICs, which might be helpful:

U17 is a 5 volt regulator.
U42 19AI25 is 2.5V precision reference, which I believe is connected to COMM jack.
U44 is an adjustable supply set to 1.9V as per my calculation.
U21 is a 20V LCD supply,  I guess.
There is a U15 IC, which I could not locate but guess it's hidden under U42. I also guess it would be 3.3V (or 3.11V)  regulator.

U18 is a voltage supervisor IC, which shuts down the MS430 if one of the monitored voltage supplies fail.

Any correction/comments on the above data would be welcome.
« Last Edit: January 02, 2019, 11:27:10 am by say »
 

Offline ElecSeb

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Re: Fluke 289 not quite sorted.
« Reply #141 on: January 02, 2019, 01:48:59 am »
I have also tried to identify some of the voltage supply ICs, which might be helpful:

U17 is a 5 volt regulator.
U42 19AI25 is 2.5V precision reference, which I believe is connected to COMM jack.
U44 is an adjustable supply set to 1.95V as per my calculation.
U21 is a 20V LCD supply,  I guess.
There is a U15 IC, which I could not locate but guess it's hidden under U42. I also guess it would be 3.3V (or 3.11V)  regulator.

U18 is a voltage supervisor IC, which shuts down the MS430 if one of the monitored voltage supplies fail.


Any correction/comments on the above data would be welcome.

U42 is non existent to my idea, this should be U15 (look at leads of chips and regular naming).
U15 belongs to nothing else and it seems this is a multi-purpose PAD/IC.
U44 is 3.6V
U18 OpAmp




Only thing I am missing at the moment is a comprehensive TP layout. IN earlier posts some mention TP which are unknown to me (cannot find them visueally and in Calibration manual they are also not mentioned).

Hope to add this info to this topic soon.

This might help :)

Nope, this I know, but read earlier posts, there are folks who are mentioning:
http://www.eevblog.com/forum/repair/fluke-289-woes/msg1380051/#msg1380051
« Last Edit: January 02, 2019, 01:52:50 am by ElecSeb »
 

Offline say

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Re: Fluke 289 not quite sorted.
« Reply #142 on: January 02, 2019, 11:15:38 am »
ElecSeb thank you for chipping in. IMO the list of TPs you are referring to is just a list and the crosses against some TPs reflect their absence on the board.

Since I'm on vacations now, I can't test the output of U44 but according to the datasheet its an adjustable LDO regulator. It's output is determined by the formula Vo=1.205 (1+R2/R1). In the circuit R1=1Mega Ohm and R2=0.562 Mega Ohm, therefore, the Vout equals approx 1.9V. I may be wrong but if someone could test the output, which is on pin5, we will know for sure. Or I will do that after ten days :).
« Last Edit: January 02, 2019, 05:17:02 pm by say »
 

Offline ElecSeb

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Re: Fluke 289 not quite sorted.
« Reply #143 on: January 04, 2019, 01:33:29 am »
It's output is determined by the formula Vo=1.205 (1+R2/R1). In the circuit R1=1Mega Ohm and R2=0.562 Mega Ohm, therefore, the Vout equals approx 1.9V. I may be I'm wrong but if someone could test the output, which is on pin5, we will know for sure.

On R258 is the code: 562 (with a 4th char not readable, however it seems like an S). Just de-soldered one and it is 562 kΩ (0.562MΩ).
I calculate based on: 562kΩ

Which then leaves us with:
Vo=1.205 (1+(R1/R2)) -> Please be careful with formulas (see brackets)
Vo=1.205 * (1+(1MΩ/0.562MΩ))=3.34V (which is what I measure on my 3 boards -> 2.9V, 3.14V and 3.00V!!!)

So I think I can 100% surely say it should be between 3.0 and 3.34V

Your formula is faulty (should be R1/R2 furthermore first divide/multiply then subtract etc).

Which leaves us with the question, is your measurement 1.9V? Then there is a problem in your circuit.
Please answer the questions from my other topic before I can help you in giving you directions.

An update on my meters:
2 NXP chips are broken (short);
1 and possibly 2 MSP430 are broken (hope to use the 2nd to read program from with MSP programmer when it arrives, same for 3rd chip). Big chance they are all blown).

So for now I am stuck waiting for the programmer.
 

Offline say

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Re: Fluke 289 not quite sorted.
« Reply #144 on: January 04, 2019, 01:10:13 pm »
@ElecSeb

You are right. I wrote the formula from memory and made a mistake. Thanks for the correction.

Since I'm currently travelling, I'm not in a position to check the TPs and resistances. When I return I will post a reply with requisite data. Thanks again.
 

Offline ElecSeb

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Re: Fluke 289 not quite sorted.
« Reply #145 on: January 04, 2019, 04:42:35 pm »
NP, enjoy your vacation  8)
 


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