| Electronics > Repair |
| Keithley 2002 repair help |
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| nikonoid:
Just ordered one. Thank you. Changing the front/back switch was a breeze. I am surprised that changing capacitors is more difficult than I expected. Holes in the board are very very tight, so vacuum desoldering iron does not help much. I have to move each leg a little bit at a time. Any additional tips there? |
| Le_Bassiste:
well... not directly related to desoldering the caps, but to general handling of the p.c.b. i'd suggest that you do not try to clean the entire pcb by any means, in order to absolutely avoid any contamination. just clean the areas that you have been working on, and you should be fine. this is IIRC also stated somewhere in the repair manual. a pcb being contaminated by residues of foreign matter (that is otherwise just sitting on the components, not doing any harm at all) dissolved by cleaning agents, and then evenly distributed across the whole board will probably send your fine meter to the point of write-off. of course, ymmv, and i'm being probably a tad too paranoid about this. it's just that my kitchen-sink equipment would simply wreak havoc on the pcb if i would try to do this, even with gallons of cleanest IPA, N2 and whatnot at my hand... :-DD so, the way i tackled that on my 2002 was just to get out a pair of nitriles, stop breathing, remove all caps, clean the areas with KONTAKT LR and cotton swabs, mount the new caps, then again clean the areas and close the box, and breathe. |
| nikonoid:
I am almost done recapping. Digital and analog boards are done. More high res photos and more questions to follow soon. Meanwhile I am facing a new dilemma now. According to manual display board contains one electrolytic capacitor: 2.2uf 100v. However when I opened that board I saw the his: I have never seen electrolytic like that. Should I replace it? What do I replace it with? I could not find the same Philips available for sale. Thanks in advance. Sent from my iPhone using Tapatalk |
| coromonadalix:
they are series 139 Aluminium electrolytic capacitors long life models, i would substitue only with an original part ... your dallas DS1243 "black chip" 64K NV SRAM with Phantom Clock is dated form year 96, if its not dead change it. WARNING : i dont know if it retain any calibrations, i dont think so ??? |
| nikonoid:
Thank you, coromonadalix, This 2.2mf 100v capacitor is a hard to find item: discontinued and non stocked. I managed to locate and purchase 25 pieces, but I only need one. If anyone here is recapping their Keithley and need one, send me a message and I will hook you up. |
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