| 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? Sent from my iPhone using Tapatalk |
| 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. Sent from my iPhone using Tapatalk |
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