Electronics > Repair
Keithley 2002 repair help
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lowimpedance:

--- Quote from: nikonoid on July 17, 2017, 01:18:09 pm ---That was actually me. I could not believe it when I saw it by pure chance and pulled the trigger right away.

It looks bad, but it will be fun to restore it. Arriving today. I will post some pictures.


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--- End quote ---
Lucky indeed  :D
Will be interesting to see the before and after pictures  :-DMM
nikonoid:
Ohhhh HORROR!!!!!

The package arrived today. I was very surprised that it was not a box, but bubble wrap blob. Oh horror!

I started opening and realized that few layers of thin bubble wrap were put right on the meter. No cardboard or peanuts anywhere. No other cushioning at all. Oh horror!

When I took the bubble wrap off the meter inside did not have the metal case! Oh horror!

More over it did not have a analog board shield at all. And apparently it was stored somewhere without the shield as the analog board is full of dust. Oh horror!

Looking the the board closely revealed few.... mice droppings on analog board! Oh horror!

Upon quick inspection I found at least two places where the analog board was apparently burned through. It appears that internal traces overheated and charred the PCB above them to charcoal. Oh horror!



I uploaded high resolution pictures to TiN, to I can post them.

Seller was able to power up the DMM up, but I am not as brave. I am going to follow Dave's typical advise "don't turn it on, take it apart".

For decontamination I am considering a large ultrasonic bath with distilled water and IPA. Or possibly using syringe to power wash it. 

Suggestions and condolences are welcome (;



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TheSteve:
It's beat to hell - looks like a good challenge that needs a lot of TLC. If you're not up for it there are many of us who are. I'd love a go :)
Paypal ready and willing  >:D
TiN:
At great price comes great responsibility  :-DD :-BROKE.
I don't ever remember 2002 going for that low.

New analog board cover kit is ~150$ from Keithley/Tek.
alm:
Looks like an interesting repair ;).

I would remove anything that can trap water (e.g. switches, non-sealed relays) or that you will replace anyhow (electrolytics?). Then rinse with demi water (to get clean water in all the nooks and crannies), then demi water with some mild soap, then demi water again and then IPA to get rid of the water. Then try to figure out what blew the traces (short on the analog board? excessive voltage from power supply?) and go from there.
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