Bug #1185
Repair status for very first 2001 unit
Start date:
04/11/2015
Due date:
% Done:
0%
Estimated time:
Description
Analog board A39754
Digital board A10142 A08
Self-test issues:
Test | A/D input | Required value |
309.1 | ||
401.1 | +/-1m | |
402.1 | 27 - 37 m | |
403.1 | -4m - 6m | |
405.2 | ||
405.4 | ||
405.6 | ||
405.8 | ||
406.6 |
Sometimes
407.1 |
407.2 |
407.3 |
409.6 |
410.1 |
411.1 |
411.2 |
Recap and clean board
Updated by tin almost 8 years ago
Replaced all caps on analog and digit board
Replaced avalance diodes for bootstrap supply (CR109-CR112)
Desolder U505, U507, U509, clean PCB , solder back.
U508 soldered new 74F00
Replaced CR514,CR513
Replaced Q305 from donor board
Assembled unit, no issues, self-test pass ok.
Unit require calibration (9.9999961V shows as 9.898215V)
Updated by tin almost 8 years ago
Update repair article with data in http://www.eevblog.com/forum/testgear/restoration-glory-of-keithley-2001-dmm/msg650609/#msg650609