| Electronics > Repair |
| Keithley 2002 repair help |
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| nikonoid:
Hello guys, I am new to this forum. I had been reading for a while, but this is my first post. I have a Keithley 2002 that I am trying to repair. It is quite old, chips are from 1998 the serial starts with 072XXXX. The board looks clean and capacitors seem to be in a fine shape. The major issue with the unit was the Front/Back switch. For now I hardwired the switch and was able to get the unit to pass self test. Can someone please recommend a source for replacement switch. I believe it is SW-468, but I cannot find a source for it. Would there be any special considerations for replacing it? Also the unit came to me without a fan. I am not sure what to make of it. It had the opening in the black protective cover and plastic air guide, like in the newer 2007 unit TiN has. For now without a fan I am limiting the use of meter to 10 minutes at a time. Can someone recommend a replacement fan and what sort of connector I would need to get to install it? Thank you very much. If I can somehow contribute to the forum, please let me know. |
| TheSteve:
Welcome to the forum! The 2002 is a great machine - certainly worth the effort to get it operating 100% again. I think your first call should be to Tektronix/Keithley and ask to speak to the parts department. You should be able to purchase the parts you need direct from the source. |
| TiN:
Welcome to forums. K2002 is my second favourite meter :). Ask Keithley/Tektronix, they might sell you switch for replacement. It's not too expensive considering the cost of the meter. You can see my articles about 2001/2002 (here and here and here) but from my memory fan is 40x40mm 12V 0.1A. For my meters I've used this one from Digikey. Bit more powerful, as I tend to run meters in warmer ambient. Also replace all electrolytics on both boards, even if they look good! They are badly thermally stressed in 2001/2002, so don't play gamble here. If you can take photos of your unit, would be nice to have. What is your firmware version? Would be good to add into collection if it's not the one we already have. |
| nikonoid:
Glad to be here. Thank you for suggestion to call Keithley for spare parts, I did not even think about this option. The switch was surprisingly less than I expected - $12 and fan surprisingly more - $47. Now I have to wait for both to arrive. As firmware is concerned, on start is says "Rev. A06 A02 IEEE Adr. = 16". Not quite sure what A02 is referring too. I will take photos and post in few days. Is it OK to post full resolution photos? For electrolytics could it be sufficient to test them with LCR miter before replacement? My soldering skills are a bit less than expect, so I would not want to risk replacing something that is not necessary. I am still going through complete checkout of the meter and just found that resistance reads wrong, but only on a single range (2MOhm) and only in 4 wire mode. Other ranges work fine and in 2 wire mode all ranges read fine. Any suggestions for what to look for? Can I re calibrate this single range? Thanks. |
| TiN:
Go for full resolution. Forum have limitation, so you can upload to my ftp (how-to link in my messages footer), I'll add them nicely to forum for you. Always a pleasure to see one more 2002 saved from dumpster diving. Just replace the caps, don't waste time with checking them. If you excercise bit of care, replacement will be just fine. Avoid touching board surface/components with fingers though, handle it by edges only to avoid leakage contamination. Calibration is bit complex on 2002, so I'd wait till you get switch replacement to see if issue stays. Could be leakage in switch causing problem. |
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