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Service Addendum12
Overall Troubleshooting – sheet 4
Figure 3-2. Overall Troubleshooting (sheet 4 of 5)
Calibrate the supply. See Appendix
A in the Operating manual.
Output voltage
approx. right but
outside spec
?
C
From Sheet 2
B From Sheet 1
PROT
annumciator on
?
Output current
approx. right but
outside spec
?
YesYes
No
Display reads
approx. output
voltage
?
Display reads
approx. 0 Amps
?
Output shorted
?
Check Voltage Monitor
circuit A1U605
Check output for
shorted circuits
Check Current Monitor
circuit A1U605
Press PROT key
No
No
Yes
No
Yes
No
Yes
Display reads
approx. output
current
?
No
No
Output low
?
Yes
Yes
Go to "Output Held Low"
troubleshooting.
Go to "Output Held Low"
troubleshooting.
Yes
No
OT
displayed
?
A5J722-31
Therm Heatsink
3.2V @ 23C
?
Check +5V Ref,
A1R510,right tunnel board
A4RT301 (10K @ 23C)
Replace A5 DSP board
Yes Yes
No
E
Go to Sheet 5
No