| Electronics > Repair |
| Keithley 2002 repair help |
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| nikonoid:
Here are more images. TiN, thanks for hosting. The digital board looks excellent and has MEM2 option installed while analog is burned and dusty. The date codes are from 1994 and firmware looks like is A05. Here are some details of bad parts. First image is intentionally overexposed to better show charred parts. Few more pictures of the bad section. It looks like the electrolyte spill. It also appears that one of capacitors short circuited and that started chain reaction. I already have few pars ordered from Digikey. Would anyone know what kind of diodes this section is using? The repair manual lists them as "DIODE, CONTROLLED AVALANCHE, BYD17GSOD-87". Also, the CR113 rectifier is listed as "DIODE, BRIDGE, VM18". I could not find it and ordered DF01MDI-ND instead. Would that be a good choice for replacement? Tomorrow I will call Keithley for replacement cover and metal casing. I still cannot believe I got it without the case, but with plastic handle! --- Quote from: TiN on July 18, 2017, 04:57:18 am ---At great price comes great responsibility :-DD :-BROKE. --- End quote --- Love the quote. |
| saturnin:
--- Quote from: nikonoid on July 18, 2017, 05:35:39 am ---Tomorrow I will call Keithley for replacement cover and metal casing. I still cannot believe I got it without the case, but with plastic handle! --- End quote --- If I were you I wouldn't complain. You got exactly what was shown in pictures in the auction. One can always ask a seller about further details, but in such cases (extremely low price), there is a risk someone else would buy it before you get answer ;) It is always lottery, if it is repairable or not. I wish you it was. Looking forward to repair details ;) |
| TiN:
WYSIWYG of T&M world. I better buy third 2002 pronto, or Keithley freak title might go to nikonoid soon Even if you decide to give up, just voltage reference parts alone would cost more than what was paid :). |
| macboy:
--- Quote from: saturnin on July 18, 2017, 09:33:10 am --- --- Quote from: nikonoid on July 18, 2017, 05:35:39 am ---Tomorrow I will call Keithley for replacement cover and metal casing. I still cannot believe I got it without the case, but with plastic handle! --- End quote --- If I were you I wouldn't complain. You got exactly what was shown in pictures in the auction. One can always ask a seller about further details, but in such cases (extremely low price), there is a risk someone else would buy it before you get answer ;) It is always lottery, if it is repairable or not. I wish you it was. Looking forward to repair details ;) --- End quote --- Exactly. I did not for even a second assume that the cover or shield were included. Nowhere to be seen = not included. Dirt and corrosion were assumed to be free though. |
| Kleinstein:
The burned trace seems to be in the power supply part. So worst case one could isolate that part and have a new power supply board. Also leakage is not that critical in that area. Chances are that after replacing the caps, a few diodes / rectifiers and with maybe a bodge wire to replace the burned trace it might actually work. A shorted power supply is more like a good sign. Really bad would such a burned trace in the Ohms or low current area, where all the guard traces are. The analog part cover and the case is more like one of the last parts to fix. |
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