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Bug #1185

Repair status for very first 2001 unit

Added by tin almost 8 years ago. Updated almost 7 years ago.

Status:
Closed
Priority:
Normal
Assignee:
tin
Target version:
Keithley 2001 #1
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

#1

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)

#3

Updated by tin almost 7 years ago

  • Status changed from In Progress to Closed

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