Electronics > Repair
Keithley 2001 Repair (Bad Capacitors)
derZockerMP:
[ Specified attachment is not available ]Hello, I recently purchased a Keithley 2001 in non-working condition.
The seller said it wouldn't even turn on. Then I received the device, I tryed to repair. The error was clearly visible. Leaked capacitors...
The corrosion on the board was so heavy that several IC footprints came off the board and a short circuit even created a hole in the board.
Do you think it is repairable? The digital board works yust fine. [ Specified attachment is not available ]
Harry_22:
This device must be repaired.
Wash the board using Flux Off or Contact Сleaner sprays. Unsolder the chips under which electrolyte may have gotten. Check all traces and especially vias.
Then you can cover all with Solder Mask Ink.
If it doesn't work, write. I have 2000.
derZockerMP:
Today I desoldered all ICs in the contaminated region. There was plenty of electrolyte under there. I also made some X-Rays of the Board. It seems that the inner Layers are not that problematic. I will order some new components today and then start to rewire the lost traces and measure for conductivity according to the schematics. On the 15V Rail to Com I meausure 80Ohm that is little bit to high to my thought. -15V stands around 1,5kOhm. I think there must be an short either.
bson:
Replace the most affected chips too, what looks like two MC14094B latches and one LM358 opamp. These are jellybean parts. The originals might still be fine, but they cost nothing and you don't really know how badly corroded the pins are, so I'd just replace them.
jonsikul:
derZockerMP, do you happen to have any good photos of the PCB in the area of the electrolytic caps? I am specially interested in the area between C116 and C117 since my PCB has basically burnt a hole there and I can't tell how the middle layers route there. Did you finish your repair and solder in new electrolytics?
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