Author Topic: Fluke 289 not quite sorted.  (Read 28092 times)

0 Members and 1 Guest are viewing this topic.

Offline nixxon

  • Frequent Contributor
  • **
  • Posts: 322
  • Country: no
Re: Fluke 289 not quite sorted.
« Reply #125 on: October 28, 2018, 08:45:52 am »
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, 11:26:14 am by nixxon »
 

Offline say

  • Contributor
  • Posts: 28
Re: Fluke 289 not quite sorted.
« Reply #126 on: December 04, 2018, 08:56:35 am »
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 04, 2018, 06:57:50 pm by say »
 

Offline Terry01

  • Frequent Contributor
  • **
  • Posts: 907
  • Country: scotland
Re: Fluke 289 not quite sorted.
« Reply #127 on: December 04, 2018, 09:40:47 am »
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!
 

Offline say

  • Contributor
  • Posts: 28
Re: Fluke 289 not quite sorted.
« Reply #128 on: December 04, 2018, 06:53:56 pm »
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 04, 2018, 06:59:21 pm by say »
 

Offline Terry01

  • Frequent Contributor
  • **
  • Posts: 907
  • Country: scotland
Re: Fluke 289 not quite sorted.
« Reply #129 on: December 04, 2018, 09:37:15 pm »
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!
 

Offline dacman

  • Frequent Contributor
  • **
  • Posts: 411
  • Country: us
Re: Fluke 289 not quite sorted.
« Reply #130 on: December 04, 2018, 10:33:16 pm »
Have you asked Fluke if the meter is under warranty?  Some 289's have a limited lifetime warranty.
 

Offline say

  • Contributor
  • Posts: 28
Re: Fluke 289 not quite sorted.
« Reply #131 on: December 17, 2018, 07:59:55 pm »
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 17, 2018, 08:03:08 pm by say »
 

Offline say

  • Contributor
  • Posts: 28
Re: Fluke 289 not quite sorted.
« Reply #132 on: December 17, 2018, 08:02:35 pm »
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

  • Frequent Contributor
  • **
  • Posts: 907
  • Country: scotland
Re: Fluke 289 not quite sorted.
« Reply #133 on: December 17, 2018, 09:43:22 pm »
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!
 

Offline coromonadalix

  • Super Contributor
  • ***
  • Posts: 3314
  • Country: ca
Re: Fluke 289 not quite sorted.
« Reply #134 on: December 17, 2018, 11:36:43 pm »
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

  • Contributor
  • Posts: 28
Re: Fluke 289 not quite sorted.
« Reply #135 on: December 25, 2018, 10:56:25 pm »
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

  • Frequent Contributor
  • **
  • Posts: 907
  • Country: scotland
Re: Fluke 289 not quite sorted.
« Reply #136 on: December 25, 2018, 11:19:58 pm »
Sounds like you need the help of someone who really knows their way around the 289  :(
Sparks and Smoke means i'm nearly there!
 

Offline say

  • Contributor
  • Posts: 28
Re: Fluke 289 not quite sorted.
« Reply #137 on: December 25, 2018, 11:25:34 pm »
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

  • Frequent Contributor
  • **
  • Posts: 907
  • Country: scotland
Re: Fluke 289 not quite sorted.
« Reply #138 on: December 25, 2018, 11:50:21 pm »
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!
 

Offline say

  • Contributor
  • Posts: 28
Re: Fluke 289 not quite sorted.
« Reply #139 on: January 01, 2019, 12:45:51 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

  • Contributor
  • Posts: 28
Re: Fluke 289 not quite sorted.
« Reply #140 on: January 01, 2019, 01:05:17 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 1.9V 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, 12:27:10 am by say »
 

Offline ElecSeb

  • Regular Contributor
  • *
  • Posts: 75
  • Country: nl
Re: Fluke 289 not quite sorted.
« Reply #141 on: January 01, 2019, 02:48:59 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 1.95V 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:
https://www.eevblog.com/forum/repair/fluke-289-woes/msg1380051/#msg1380051
« Last Edit: January 01, 2019, 02:52:50 pm by ElecSeb »
 

Offline say

  • Contributor
  • Posts: 28
Re: Fluke 289 not quite sorted.
« Reply #142 on: January 02, 2019, 12:15:38 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, 06:17:02 am by say »
 

Offline ElecSeb

  • Regular Contributor
  • *
  • Posts: 75
  • Country: nl
Re: Fluke 289 not quite sorted.
« Reply #143 on: January 03, 2019, 02:33:29 pm »
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

  • Contributor
  • Posts: 28
Re: Fluke 289 not quite sorted.
« Reply #144 on: January 04, 2019, 02:10:13 am »
@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

  • Regular Contributor
  • *
  • Posts: 75
  • Country: nl
Re: Fluke 289 not quite sorted.
« Reply #145 on: January 04, 2019, 05:42:35 am »
NP, enjoy your vacation  8)
 

Offline romantronixlab

  • Regular Contributor
  • *
  • Posts: 83
  • Country: us
Re: Fluke 289 not quite sorted.
« Reply #146 on: April 20, 2019, 01:42:10 pm »

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.

1. What are these components (ideally with link to a data-sheet):
Q12, Q13 -> Code 337 -> FDN337N -> N-Channel Enhanced Mosfet + body diode -> FDN337N
Q20, Q21, Q43 -> Code 338 -> NDS338N -> P-Channel Enhanced Mosfet + body diode -> FDN338P
U11 -> Code S08H ->  NC7S08 -> AND GATE -> NC7S08

2. What is the difference between VR05 and U04 (why is one name with a "U" and the other "VR"):[/b]
VR05 ->Code 8H -> MMBZ5233BLT1G -> Zener Voltage Regulators 225 mW SOT−23 Surface Mount.  As the name implies it regulates the incoming voltage to a stable predetermined voltage. Hence VR-Voltage Regulator
U04 -> Code R1E -> LM4041 -> LM4041-N-xx Precision Micropower Shunt Voltage Reference. The U - Integrated Circuit device

Have no clue as to the third Q.  And just typing this I noticed the date of the post.  :palm: Still good information.  ;D

Edit: Updated to reflect added information related to U11 component.
« Last Edit: May 30, 2019, 08:34:46 pm by romantronixlab »
Will think about it.
 

Offline Terry01

  • Frequent Contributor
  • **
  • Posts: 907
  • Country: scotland
Re: Fluke 289 not quite sorted.
« Reply #147 on: June 11, 2019, 08:12:59 am »
Did you get your meter fixed buddy?
Sparks and Smoke means i'm nearly there!
 

Offline say

  • Contributor
  • Posts: 28
Re: Fluke 289 not quite sorted.
« Reply #148 on: July 22, 2019, 09:26:42 pm »
Did you get your meter fixed buddy?
I ruined mine. :(
 

Offline Terry01

  • Frequent Contributor
  • **
  • Posts: 907
  • Country: scotland
Re: Fluke 289 not quite sorted.
« Reply #149 on: July 24, 2019, 07:07:05 pm »
Did you get your meter fixed buddy?
I ruined mine. :(

Awe man! That sucks buddy.  :(
Sparks and Smoke means i'm nearly there!
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf