Hi,
recently I managed to grab 2001 for parts/repair really cheaply. It seems the unit had a long history, manufactured around 1992, A06 firmware, RevK analog board and RevJ digital. Someone already replaced most of the caps on the analog board around 2004/2007 (these were the dates on the caps). I replaced some of them anyway and replaced all on the digital board (these were original and leaking a bit). All the power rails seem OK.
However, my problem is with the ADC board. It is also unusual - it seems Keithley didn't have 7.68 MHz oscillator, so they developed a 2001-132-02A mini board with XTAL, HCU04 & misc to generate the clock. It was failing all the 200.x tests and in consequence some other tests as well.
I've checked the front end switches and muxes and these seemed to work ok, providing on AD_IN 0V, 7V, 10V or 1.75V*5 in various diagnostic modes. Then I noticed that R857 (sits between -15V and NE5534) is damaged, it got burned pretty badly, leaving tar on the PCB and came off the PCB in two parts. I replaced that with a new 100 Ohms and hoped that was the problem, but unfortunately no
I did some more probing, checked Q806 (as this was the issue for ManateeMafia) etc, and then I must have slipped the probe perhaps (I don't see any other explanation), because the Altera CPLD no longer works. It receives clock and data on SCLK/DATA_IN but DATA_OUT remains silent. Now built-in tests hang on 200.x.
I know it's a long shot, but maybe one of the forum members has a spare 2001 ADC board they could part with (for a reasonable price)?