EEVblog Electronics Community Forum

Electronics => Repair => Topic started by: Arca on March 03, 2021, 05:52:39 pm

Title: Keithley 2100 - DSP pin assignment/interconnection
Post by: Arca on March 03, 2021, 05:52:39 pm
Hello all,

I got a "broken" Keithley 2100.

It had error +599 that I solved by replacing the 1000uF capacitors. Now it looks to run fine, Self Test is OK.

I have a question about the DSP. It seems that there is some "bridges" between pins on the ones I have.
(https://i.servimg.com/u/f22/13/95/20/08/thumbn10.jpg)

Is it normal ? Could you show me picture of your DSP to compare ?

Thx :)
Title: Re: Keithley 2100 - DSP pin assignment/interconnection
Post by: picburner on March 03, 2021, 06:32:18 pm
pins 14 and 15 are both VSS, so there is no problem, for the others I don't know.
Title: Re: Keithley 2100 - DSP pin assignment/interconnection
Post by: picburner on March 04, 2021, 01:40:06 pm
This pic is taken from here (https://jais.ru/info/servisnyj-centr/v7-781-voltmetr-cifrovoj-universalnyj/), the instrument is one of the Keithley 2100 clones.
With a little imagination, since the pic is poorly defined, it would seem that the pins are short-circuited here too.
Title: Re: Keithley 2100 - DSP pin assignment/interconnection
Post by: Arca on March 04, 2021, 05:43:14 pm
Hello,

Thanks a lot for your answer ! :)

So yes you are right, it seems that it's normal.

I admit that I was a little bit stressed because my soldering iron fell inside... 😅

So thank you again !
Title: Re: Keithley 2100 - DSP pin assignment/interconnection
Post by: arturmariojr on August 04, 2021, 03:19:02 pm
For Keithley Service Manual, it is the same as Array M3500A. Here you are the service manual.
Best wishes!
Artur