Author Topic: Restoration glory of Keithley 2001 DMM  (Read 337065 times)

0 Members and 7 Guests are viewing this topic.

Offline CM

  • Contributor
  • Posts: 13
  • Country: us
  • Claude Mundy
Re: Restoration glory of Keithley 2001 DMM
« Reply #850 on: July 06, 2024, 08:46:18 pm »
Yes, I replaced the caps.  I used the Nichicon UVZ series, which are high temp capacitors.  They seem to closely match the original.  My thinking is that the higher temp capacitors have better thermal stability. For C116 and C117, I bumped up the voltage calacity from the original 35V to 50V, as these caps are subject to the 34V - 38V bootstrap voltage.  On the digital board, for C624, C630 and C633, I bumped up the voltage capacities from 16V to 35V, as I saw a trace of leakage around C624.
 
The following users thanked this post: w.v.s.

Offline w.v.s.

  • Regular Contributor
  • *
  • Posts: 224
  • Country: de
Re: Restoration glory of Keithley 2001 DMM
« Reply #851 on: December 24, 2024, 01:19:37 am »
Short update (it's really time to go to bed now): Cleaned my board and repopulated most of it (right now left most of the 110/120/220/240 V switching stuff inactive). Device powers up and runs all test without errors. So only some open points left like "Where to get a proper substitution for R100 or that plastic ferrite-holder". I'll probably post some more details on my restoration, but since the first run did not show any errors, I will not have any interesting to share about finding their root causes.

Have a nice Christmas-time!
 

Offline w.v.s.

  • Regular Contributor
  • *
  • Posts: 224
  • Country: de
Re: Restoration glory of Keithley 2001 DMM
« Reply #852 on: December 28, 2024, 04:51:29 pm »
Yesterday (last night), I discovered a really nice x-ray collage shot of the analog board on TiNs website.
https://xdevs.com/fix/kei2001/
Thank TiN very much for sharing that and all the other helpful information!  :-+ Since I did not see it mentioned in this thread, I thought I would post the link here, if there are others not aware of its existence.
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf