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Troubleshooting - 3
31
Program full scale
voltage and current
and enable output.
Measure output
voltage with an
external voltmeter.
Display zero V but
output OK?
Check W7 (Vmon) and
A
2, Interface board
Yes
CV or CC
A
nnunciator on?
No
CC?Yes
Displays current
equal to prog
value?
Yes
Check for short across
output such as output
cap C382, CR342, etc.
Yes
CC_Prog, R360
-4.7V
?
No
Check W7, A2
Interface Board
No
IMon_H,
U309A-6,~0V
?
Yes
Check Positive Current
Control Circuit, U310B
Yes
Check High Range
Current Monitor Amp,
U309A
No
Go To sheet 9
No
Q305A base
-11.4V
?
No
PM_Inhibit, R335
Low
?
No
Troubleshoot Turn-On
Control Circuit, Q305B,
C, D and U305A
Yes
Check W7, A2
Interface Board
No
Go to sheet 8
Yes
Figure 3-1 Sheet 7. No Output Voltage