Electronics > Repair
Keithley 2002 repair help
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Samogon:
Here it is, after approx 1 hour of warm up.
Ambient temp 24C
nikonoid:

--- Quote from: Samogon on June 14, 2017, 02:25:10 am ---Here it is, after approx 1 hour of warm up.
Ambient temp 24C

--- End quote ---

Also a 20C rise in temperature and the same spot! Thank you very much.

I guess there is nothing wrong with temperature rise on my K2002...  Great news after all.

nikonoid:
Parts arrived. I am looking at replacing U232 and desoldering it looks a bit daunting with guard traces and precision resistors in a close proximity:



Using fan is out of the question because of thermal concern for resistors. I am considering an enamel wire to bend legs up one by one, as I am desoldering them. And also use of no-clean RMA flux, because I will not be able to clean under microchip after soldering replacement.

Any suggestions for a proper procedure?

How about not desoldering the microchip at all, but just adding a new one on the top of non working chip?  :) It is just an analog switch and the only fault is that one channel sometimes does not turn on completely....  Would that be too crazy?






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Samogon:
Just cut legs off. No heat, no contamination.
nikonoid:

--- Quote from: Samogon on June 15, 2017, 06:52:16 pm ---Just cut legs off. No heat, no contamination.

--- End quote ---

Sounds brutal, but effective :)

Almost like quote from a mafia movie: "oh, just cut the legs off"

All joking aside I was afraid of leg moving enough from just being cut and damaging the pad. I practiced on two throw away SOIC 16 chips and the procedure worked like a charm.

Thank you, Samogon.


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