Author Topic: Fluke 199C scopemeter repair  (Read 5105 times)

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Offline feedback.loop

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Fluke 199C scopemeter repair
« on: July 28, 2020, 12:22:26 am »
Two 199C units were picked up on eBay for parts. Both are incomplete, but one is more so. The other one was repaired. A keypad board was designed and manufactured. Despite of a silly mistake, this first version turned out to be usable. The second unit also shows some hope, but it needs a memory module and a power connector. It also features a very ugly spot on its LCD. And both units need batteries, so, perhaps, yet another li-ion battery upgrade is coming. Hopefully.



Connector on Mouser: https://www.mouser.com/ProductDetail/649-SLW15S-1C7LF
FFC on Mouser: https://www.mouser.com/ProductDetail/326-42103
Fan on Mouser: https://www.mouser.com/ProductDetail/108-AFB0405LA-A
« Last Edit: July 28, 2020, 05:41:17 am by feedback.loop »
 
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Offline coromonadalix

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Re: Fluke 199C scopemeter repair
« Reply #1 on: July 28, 2020, 01:35:26 am »
Incredible work   :-+
 
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Online Shock

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Re: Fluke 199C scopemeter repair
« Reply #2 on: July 28, 2020, 06:55:49 am »
Congrats on getting them up and running. Hopefully when the battery packs are in the nag goes away, easily tested anyway. Time to binge watch some more of your videos. :D
Soldering/Rework: Pace ADS200, Pace MBT350
Multimeters: Fluke 189, 87V, 117, 112   >>> WANTED STUFF <<<
Oszilloskopen: Lecroy 9314, Phillips PM3065, Tektronix 2215a, 314
 

Offline avellanet

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Re: Fluke 199C scopemeter repair
« Reply #3 on: July 28, 2020, 12:43:38 pm »
I am a hobbyist and have learned a lot by watching your videos the last couple of years.  I thank you for that.  Keep them coming.   :-+
 

Offline Per Hansson

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Re: Fluke 199C scopemeter repair
« Reply #4 on: July 28, 2020, 03:12:14 pm »
Nice video, I have ordered the power connector directly from Fluke myself, it cost only ca $20 in Sweden excl tax.
This was for a Fluke 225C but the 199C is identical AFAIK only software difference (Bus health test feature)
The part number is provided in this post, it is actually for a 196C but it fit just fine :)

https://www.eevblog.com/forum/repair/another-fluke-196c-scopemeter-repair/msg985414/#msg985414
 
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Offline feedback.loop

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Re: Fluke 199C scopemeter repair
« Reply #5 on: July 28, 2020, 07:57:00 pm »
A few hours after publishing my previous video I realized that there is a very easy fix for the problem with the mirrored connector. How come It did not occur to me right away? It is so obvious (once you know the answer)! Just use an FFC with contacts on the opposite sides.



Opposite-side FFC: https://www.mouser.com/ProductDetail/710-686715100001
 

Offline Simon Spiers

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Re: Fluke 199C scopemeter repair
« Reply #6 on: July 28, 2020, 08:53:30 pm »
If you have a spare ASIC for the input I would be interested anyone?

Offline EHT

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Re: Fluke 199C scopemeter repair
« Reply #7 on: July 28, 2020, 09:13:23 pm »
Amazing job making the keypad!

I have a B model and I can hear the fan bearings are going. Pity the same model fan isn't available. I wonder if anyone else has find one that fits the mounting? If you're replacing one, maybe the metal housing can be reused? There is this 'nidec copal' on digikey as well as the Delta brand ones. However, it is 400mW...

 

Offline coromonadalix

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Re: Fluke 199C scopemeter repair
« Reply #8 on: July 29, 2020, 02:31:08 pm »
would a reversed flat cable could have worked ? 

straight = flat pins on the same side
reversed = flat pins connector on opposed sides
 

Offline feedback.loop

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Re: Fluke 199C scopemeter repair
« Reply #9 on: July 29, 2020, 03:50:15 pm »
Here is the response from Fluke technical support regarding the memory module and the power connector with sealing ring:

PN 402224619841/ PN 2042555: Item Desc :FLASH/SRAM MODULE 190BC
This item was discontinued in March 2017

PN 402224492561/ PN 1285578: Item Desc :POWER CONNECTOR SP
MSRP:  $33.98
ATP:   6 WEEKS

PN 402224498331/ PN 1286052: Item Desc :SEALING RING FOR POWER CONNECTOR
This item was discontinued in June 2009. Replaced with PN 2413816
PN 2413816: Item Desc :SEALING RING POWERCON.
MSRP:  $7.21
ATP:   6 WEEKS
 

Offline lostking2008

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Re: Fluke 199C scopemeter repair
« Reply #10 on: July 31, 2020, 02:15:04 am »
Hi FeedbackLoop,

That's an awesome feast to DIY the kaypad foil for 199C. I need one keypad foil for a 199C. Are you going to put the extra ones up for sale as you mentioned in your video #93?

Thanks,
Ken
 

Offline feedback.loop

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Re: Fluke 199C scopemeter repair
« Reply #11 on: July 31, 2020, 05:03:08 pm »
Hi FeedbackLoop,

That's an awesome feast to DIY the kaypad foil for 199C. I need one keypad foil for a 199C. Are you going to put the extra ones up for sale as you mentioned in your video #93?

Thanks,
Ken

Perhaps. I still need to order some opposite-side cables, more connectors and give this a try.
 

Offline Rollin Hand

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Re: Fluke 199C scopemeter repair
« Reply #12 on: August 01, 2020, 01:18:48 pm »
I need the battery mod.
 

Offline feedback.loop

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Re: Fluke 199C scopemeter repair
« Reply #13 on: August 01, 2020, 08:34:08 pm »
I need the battery mod.

I am working on it.
Teaser photo attached  :)
« Last Edit: August 02, 2020, 01:25:59 am by feedback.loop »
 

Offline feedback.loop

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Re: Fluke 199C scopemeter repair
« Reply #14 on: August 05, 2020, 04:55:32 pm »
DIY Li-ion battery pack for Fluke 19x scopemeters. About twice the capacity of the original Ni-MH pack. Requires a small modification in the scopemeter: adding a 120K 1% resistor across R4113.



Li-ion battery testing using Agilent 661x: https://youtu.be/riB0NASj_KU

Connector housing on Digikey: https://www.digikey.com/product-detail/en/molex/0050375043/WM17405-ND/259392
Crimp contacts on Digikey: https://www.digikey.com/product-detail/en/molex/0008701040/WM17406-ND/259393
« Last Edit: August 05, 2020, 04:59:40 pm by feedback.loop »
 
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Offline feedback.loop

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Re: Fluke 199C scopemeter repair
« Reply #15 on: August 05, 2020, 06:50:49 pm »
I should have shown a close-up of the BMS in the video.
 

Online Vince

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Re: Fluke 199C scopemeter repair
« Reply #16 on: August 05, 2020, 08:56:36 pm »
Wow, a lot of work/detail indeed, you really do seem to enjoy tinkering with battery replacements !  :-+


It was so in depth that I was kinda surprised and " disappointed " that you didn't go to the extent of actually measuring accurately the start-up current of the scope with.. another scope, to see exactly how much current it needs, see the shape of the waveform, how it progressively settles to 900mA etc.. would have been cool  :)



 

Offline feedback.loop

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Re: Fluke 199C scopemeter repair
« Reply #17 on: August 05, 2020, 09:01:41 pm »
Many things could have been explored in more detail. Such things take a lot of time. At some point you just have to choose and call something good enough.
 

Online Vince

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Re: Fluke 199C scopemeter repair
« Reply #18 on: August 05, 2020, 09:06:27 pm »
Yes of course !  :-+ 
 

Offline lostking2008

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Re: Fluke 199C scopemeter repair
« Reply #19 on: August 05, 2020, 10:46:51 pm »
Hi FeedbackLoop: This modification is awesome as usual. BTW, I need one keypad foil for a 199C. Just wondering if you'll share the gerber file of the designed keypad foil if possible. Thanks a lot. ---Ken.
 

Offline Rollin Hand

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Re: Fluke 199C scopemeter repair
« Reply #20 on: August 06, 2020, 12:16:01 pm »
The BMS is 2S 7.4V 7.2V Li-ion Li-Po Battery Protection BMS PCM Ch/Dis. Current 4A 2S4AW004.

eBay item number:321761796022
 I think this is the correct one?
You think is necessary to install the 130k resistor ? it will damage the pack by overvoltage? because my screen is fragile ,for me is to much risk to take it  a part.
Thank you.
Rollin
 

Offline feedback.loop

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Re: Fluke 199C scopemeter repair
« Reply #21 on: August 06, 2020, 04:43:42 pm »
The BMS is 2S 7.4V 7.2V Li-ion Li-Po Battery Protection BMS PCM Ch/Dis. Current 4A 2S4AW004.

eBay item number:321761796022
 I think this is the correct one?
You think is necessary to install the 130k resistor ? it will damage the pack by overvoltage? because my screen is fragile ,for me is to much risk to take it  a part.
Thank you.
Rollin

Looks right. Not the cheapest one though. I believe I have seen under $3 delivered.
I used a 120K resistor. 130K will probably set the voltage too high. I believe it is necessary. As I mentioned in the video, BMS will prevent catastrophic overvoltage, but we should not rely on it for normal charging. It is set to about 8.6V.
On the other hand, removing the main board does not involve removing the LCD. So I don't see a problem.
 

Offline aqibi2000

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Re: Fluke 199C scopemeter repair
« Reply #22 on: August 06, 2020, 09:05:42 pm »
Feedback loop can you share the gerber file so he can fix his 199C?
Tinkerer’
 

Offline feedback.loop

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Re: Fluke 199C scopemeter repair
« Reply #23 on: August 06, 2020, 09:25:25 pm »
I don't mind sharing the gerbers. I am a bit reluctant because I am not proud of the connector placement. I would like to move it a bit down, so that it wouldn't need to be soldered a bit above the board, and it would be a bit easier to install the board. Perhaps I should make the change and run another batch, but I don't need them myself. Is there enough demand, say for 10 boards? Say, we call it $20 plus postage for one kit: board + connector + falt flex (with opposite-side contacts) for the new batch. I still have a couple from the first batch ($30 + postage).
« Last Edit: August 06, 2020, 10:05:26 pm by feedback.loop »
 

Offline cheeseit

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Re: Fluke 199C scopemeter repair
« Reply #24 on: August 06, 2020, 10:00:24 pm »
I always thoroughly enjoy your videos! :-+
 

Offline cozza

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Re: Fluke 199C scopemeter repair
« Reply #25 on: August 06, 2020, 10:30:16 pm »
I'd be keen for one of the keypad replacement boards, or to add one to your order if you're going to do a small production run. I use my 196B almost daily for work and it would be great to have a spare keypad standing by in case the foil keypad fails!
 

Offline lostking2008

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Re: Fluke 199C scopemeter repair
« Reply #26 on: August 06, 2020, 10:35:44 pm »
Good point. Thanks.


I don't mind sharing the gerbers. I am a bit reluctant because I am not proud of the connector placement. I would like to move it a bit down, so that it wouldn't need to be soldered a bit above the board, and it would be a bit easier to install the board. Perhaps I should make the change and run another batch, but I don't need them myself. Is there enough demand, say for 10 boards? Say, we call it $20 plus postage for one kit: board + connector + falt flex (with opposite-side contacts) for the new batch. I still have a couple from the first batch ($30 + postage).
 

Offline lostking2008

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Re: Fluke 199C scopemeter repair
« Reply #27 on: August 13, 2020, 01:59:45 pm »
Hi There, I need a memory module for Fluke 199C, but it has been discontinued by Fluke back in 2017. Unfortunately, the service manual doesn't come with the circuit drawing of the Flash/SRAM module (80 contacts in two rows, 0.8mm pitch) itself. Does anyone have a schematic drawing of the memory module?

Thanks,
Ken
 

Offline lostking2008

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Re: Fluke 199C scopemeter repair
« Reply #28 on: August 18, 2020, 07:51:41 pm »
Hi Feedback loop,

Just curious where did you obtain a blank flash/sram module for your Fluke 190 series scopemeter?

Thanks.
Ken


---------------------------------------------------------------------------------------
FeedbackLoop
2 days ago
I do have a Fluke serial adapter. I would be interested in maintenance commands like loading firmware into a blank flash/sram module, maybe changing scope type from 196 to 199 and such. Any info on this? Thank you.



David V
David V
1 day ago
@FeedbackLoop  Sorry, the only information I have regarding the commands is the information that came on the original PM9080 interface disk (3.5" floppy version 1.3) for DOS. These are all ( two letter) operating commands. Fluke can be awfully stingy with information.



ken tsai
ken tsai
5 hours ago
@FeedbackLoop I was wondering if the optical port of the fluke scopemeter (essentially a UART port) can be explored by the OPEN on-chip debugger along with GDB (The GNU Project Debugger) to create breakpoints during the firmware loading process in Fluke 190 series scopemeter.



FeedbackLoop
FeedbackLoop
1 hour ago
@ken tsai I don't know. Sounds like a lot of work. Probably easier to make an adapter for a programmer to read-write the flash chips directly. At least for the models with a flash/sram module (19x B and C). This discussion is in a wrong place. Should we move it to https://www.eevblog.com/forum/repair/fluke-199c-scopemeter-repair/
 

Offline feedback.loop

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Re: Fluke 199C scopemeter repair
« Reply #29 on: August 18, 2020, 07:58:53 pm »
Hi Feedback loop,

Just curious where did you obtain a blank flash/sram module for your Fluke 190 series scopemeter?

Thanks.
Ken

---------------------------------------------------------------------------------------
FeedbackLoop
2 days ago
I do have a Fluke serial adapter. I would be interested in maintenance commands like loading firmware into a blank flash/sram module, maybe changing scope type from 196 to 199 and such. Any info on this? Thank you.

I did not say I have it. I spoke hypothetically. Suppose we manage to produce one. How do we program it? I see only one method at the moment: building an adapter for a programmer to access the flash chips directly (with a jumper selecting one of the two chips), and copy from a working module, but that is a lot more additional work. It would be nice if there was a method to put a blank module into the scope and program it.
 

Offline lostking2008

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Re: Fluke 199C scopemeter repair
« Reply #30 on: August 19, 2020, 02:50:58 am »

I believe one option is to make a blank Flash/SRAM module using memory ICs with alternative packages, e.g. TSOP-48 with DIP-48 socket adapter. Then it should be straightforward to program the two flash ICs individually with a universal programmer prior to assembling the memory module.

[/quote]
I did not say I have it. I spoke hypothetically. Suppose we manage to produce one. How do we program it? I see only one method at the moment: building an adapter for a programmer to access the flash chips directly (with a jumper selecting one of the two chips), and copy from a working module, but that is a lot more additional work. It would be nice if there was a method to put a blank module into the scope and program it.
[/quote]
 

Offline feedback.loop

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Re: Fluke 199C scopemeter repair
« Reply #31 on: August 19, 2020, 06:31:29 am »

I believe one option is to make a blank Flash/SRAM module using memory ICs with alternative packages, e.g. TSOP-48 with DIP-48 socket adapter. Then it should be straightforward to program the two flash ICs individually with a universal programmer prior to assembling the memory module.


1. There is no room for bigger packages.
2. How do you propose to read a working module?

By the way, I ordered a TE connector you suggested (TE 5-5179009-3). Unfortunately, the slot is too narrow. It was not specified on the drawings because it is not a card edge connector, but a board-to-board connector, and should mate with a matching male connector. No luck. And I still did not figure out the schematic of the module.
 

Offline lostking2008

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Re: Fluke 199C scopemeter repair
« Reply #32 on: August 19, 2020, 04:22:17 pm »
1. The Fluke 199C comes with at least two type of memory modules, see some photos at
https://www.eevblog.com/forum/buysellwanted/wanted-non-working-flashsram-memory-modules-from-fluke-190bc-series/msg3169542/#msg3169542

I tried the 5-5179009-3 Board-to-Board Receptacles. It seems a little narrow for the 1.2 mm pcb card type memory module (bottom photo in the above link), but it indeed can be pressed into the female connector.

The module (shown in the top photo of the above link) fits the TE connector better. This type of memory module will lay flat, paralleled to the main PCA. It saves more room than the cartridge memory module. So if a blank module can be designed like this it will accommodate four memory IC chips with TSOP-48 package or something similar.


2. Patpat proposed an excellent utility called FlashFW2bin back in 2017:
https://www.eevblog.com/forum/microcontrollers/fluke-19xbcii-firmware-to-binary-converter/

This utility supposes to takes the firmware file (Tetra.ldf, or data.bin) from within Fluke's FlashTool
(F190_II_V11.44.exe, FlashTool_19xC_2xC_V804.exe, FlashTool_F190C_V615.exe, etc.)
and converts it into 2 binary files for analysis purposes. FlashTool_19xC_2xC_V804.exe still is on Fluke website. But I don't know how to run the utility because my Windows 7 won't do it.  Could you give it a try?

3. I concur the main obstacle right now is to figure out the schematics of the Flash/SRAM memory module pcb. It might be possible to remove the 4 memory ICs and trace the circuit for a donor or even non-working module.

 

 

Offline USMC_Spike

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Re: Fluke 199C scopemeter repair
« Reply #33 on: February 03, 2021, 08:19:08 am »
This is good stuff, thank you Feedback.loop.  :)

I've gone through the process of trying to get my lowly 199 black & white meter
up and running as I've not used it in about a year.  We know the routine.
Dead battery, plug in and let is charge for a few hours and then get start it up.

I checked things then turned off the power while it charged over night
thinking I'd follow Feedback.loop and use a LIon battery pack that I'll
have to make.

Bad news is I think this battery pack died.  I tried to power up again and it wouldn't.
This is my second battery pack and they all do the same, they die on you and refuse
to start up again.

I know I'll need to add the 120K resistor, no problem.

QUESTION(S):

I can source six of the batteries to make the batterypack, no problem.
My question is to build the pyramid I'm not sure if I can solder leads to
the battery ends with out damaging them. Is there a method?

I assume that manufactured packs come from the factory with spot welded
leads and hook ups.  Then I learned that I have to use the parallel series
protection board...you mentioned you'd share the gerbers.

I'm not very experienced doing SMD, I have some practice boards that I
destroy all the time.  I've got no problems doing tube gear and older
test equipment as they have discreet components.  I don't have a
hot air attachment for my rework station, which I think is needed
as I'm good at melting the SMD parts.

So, what is the best way to proceed? 

Spike


 

Offline feedback.loop

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Re: Fluke 199C scopemeter repair
« Reply #34 on: February 03, 2021, 04:40:41 pm »
Gerbers were discussed with respect to keypad, not BMS. I always buy BMS. So many types are readily available for a few bucks.
 

Offline RCO_JOE

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Re: Fluke 199C scopemeter repair
« Reply #35 on: March 18, 2021, 03:35:04 pm »
@feedback.loop

I am a big fan of your personality and "Close enough" attitude on creating your solutions.  I have watched your battery replacement on the 199C at least 50 times before i made the attempt on my 199B.  I used a 100K resistor in series which produced a final voltage of  7.97 volts.  I just wanted to share this info because it is difficult to find the voltage to the resistance value on a project like this. 

My objective was to put abundant safety first in my scope since it will be sitting on the shelf more than being a daily used item.
« Last Edit: March 18, 2021, 04:14:16 pm by RCO_JOE »
 

Offline EHT

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Re: Fluke 199C scopemeter repair
« Reply #36 on: March 20, 2021, 12:26:16 am »
I think the backlight on my 196B is starting to get a bit dodgy. It takes a little while to 'warm up' and it's now noticeably brighter in the bottom left corner. Perhaps it could be the HV supply to it but I suspect the lamp. I can't find a thread about fixing this. From the service manual it looks like the lamp is integrated into the LCD module  :-\  Anyone tried fixing the backlight? (maybe deserves a new thread if so...)
 

Online smaultre

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Re: Fluke 199C scopemeter repair
« Reply #37 on: April 18, 2021, 01:13:57 pm »
Hi! Who know any terminal command to read the unit serial number? My two devices has abandoned stickers on back panel.
 

Offline feedback.loop

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Re: Fluke 199C scopemeter repair
« Reply #38 on: June 15, 2021, 07:14:08 am »
Finally I got around to this project of replicating a memory module for Fluke 19xBC scopemeters.


 
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Offline Runco990

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Re: Fluke 199C scopemeter repair
« Reply #39 on: June 15, 2021, 08:57:58 pm »
Wow... that is impressive! 

Should you decide to offer this in the future, I would be in the market for one module.   :-+

 

Offline feedback.loop

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Re: Fluke 199C scopemeter repair
« Reply #40 on: June 15, 2021, 10:44:43 pm »
Wow... that is impressive! 

Should you decide to offer this in the future, I would be in the market for one module.   :-+

Do you have a scopemeter with no memory module? What model? Do you care about the firmware version?
 

Offline Runco990

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Re: Fluke 199C scopemeter repair
« Reply #41 on: June 16, 2021, 02:19:41 am »
I picked up a 199c a long time ago with hopes to repair it.... the module and battery were missing.
At the time, the scope meter was free, so I didn't care and shelved it for a better day.
If I can get it going, I already plan to do your battery mod. 
I DO know the scope works, as I had a chance to test it with a memory module from another one.

Love your videos, btw!  Always a treat!

Quote from: feedback.loop
link=topic=248730.msg3588783#msg3588783 date=1623797083
Wow... that is impressive! 

Should you decide to offer this in the future, I would be in the market for one module.   :-+

Do you have a scopemeter with no memory module? What model? Do you care about the firmware version?

« Last Edit: June 16, 2021, 02:21:56 am by Runco990 »
 

Offline feedback.loop

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Re: Fluke 199C scopemeter repair
« Reply #42 on: June 16, 2021, 03:37:53 pm »
Uploading the firmware just in case anyone is interested.
 
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Offline asis

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Re: Fluke 199C scopemeter repair
« Reply #43 on: June 17, 2021, 10:17:22 am »

Hi,

Serial number of your "reference" scopmeter: DM8460252 (look at the back of the case, bearing in mind that the cover may be from another device)
.
The dump (s) you have read contain the SW, S / N and calibration constants of this instrument only with its actual serial number (DM840252).

Several years ago, I was not tasked with cloning the A201 module.

I just did the work of reverse engineering this module without unsoldering anything, in about the same manner as you did, and made an adapter for programmer, with the help of which, copied the contents of FlashRAM in two steps 16bit x 2 = 32 bit.

I copied working dumps v702, v804 from them and made an UPDATE to Fluke 225C with busheat and language support.

If you do this, your hands will be untied and you will feel confident.
The serial number of the device is fragmented and located in different SST39VF800A chips.

The most interesting is how do you UPDATE SW to v7.0 - v8.04?

Fluke stated that UPDATE SW from v6.12 to v7.00 can only be done at a service center with a 5500A or similar calibrator.

In any case, you have done a great job.

My congratulations. :-+
 

Offline feedback.loop

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Re: Fluke 199C scopemeter repair
« Reply #44 on: June 17, 2021, 03:47:29 pm »
Hi asis,

Yes, the number is correct.
Please give more details. Where is the number located?
What connector did you use for your adapter? I could not find a suitable connector. Do you have a part number?

I made one more module and updated it to 6.15, which worked fine. No idea yet how to go to 8.04.
It seems I need to figure out the calibration process since the copied module does not match another unit anyway.
Looking at the documentation, it seems quite simple, and I have everything except one thing: a source of 50Vpp 1KHz square wave.
Perhaps I could arrange a special circuit for this, but that is another project.
 

Offline feedback.loop

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Re: Fluke 199C scopemeter repair
« Reply #45 on: June 20, 2021, 04:09:16 am »
In the previous video this original Fluke memory module was taken apart to trace connections on the board and to read FLASH chips. In this episode the module was put back together.


 

Offline Per Hansson

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Re: Fluke 199C scopemeter repair
« Reply #46 on: June 20, 2021, 09:47:28 am »
Very nice job!
Will you experiment with trying to make an external programmer for it now as some people theorized would be possible?
Would be nice to be able to make a safety backup of the CAL constants of the meter I have :)
 

Offline feedback.loop

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Re: Fluke 199C scopemeter repair
« Reply #47 on: June 20, 2021, 06:02:33 pm »
Very nice job!
Will you experiment with trying to make an external programmer for it now as some people theorized would be possible?
Would be nice to be able to make a safety backup of the CAL constants of the meter I have :)

That would be nice to have, but that is another project. So far I could not find a suitable connector. 40x2=80 pins 0.8mm pitch 1.2mm slot.
 

Offline Per Hansson

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Re: Fluke 199C scopemeter repair
« Reply #48 on: June 20, 2021, 06:30:36 pm »
There is only one connector on Mouser with a pitch of 0.8mm, but the slot seems to be 1.0mm:
https://www.mouser.com/ProductDetail/TE-Connectivity/440360-2?qs=WZRMhwwaLl8LRBi%2FdA7C5w%3D%3D
 

Offline feedback.loop

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Re: Fluke 199C scopemeter repair
« Reply #49 on: June 26, 2021, 12:10:28 am »
It seems that DigiKey ran out of CY62146G30-45BVXI RAM chips I bought for my first version for about $2/piece. Similar Cypress chips are $7.7/piece. So I looked around and found ISSI IS62WV25616EBLL-45BLI for $3.55/piece. I ordered a few chips, and built one more memory module. Works fine.
 
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Offline feedback.loop

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Re: Fluke 199C scopemeter repair
« Reply #50 on: June 29, 2021, 11:37:59 pm »

I copied working dumps v702, v804 from them and made an UPDATE to Fluke 225C with busheat and language support.


Could you share the dumps please?
Thank you.
 


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