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Service Addendum 9
Overall Troubleshooting (sheet 1)
Figure 3-2. Overall Troubleshooting (sheet 1 of 5)
Start "Overall
Troubleshooting"
Display On?
Turn off supply, disconnect
the load and push the sense
switch on the rear panel in
(local). Turn on the supply
1. Check ac input and line cord
2. Check line fuse
3. Turn off supply, remove top cover, check line
voltage select jumpers on T1.
4. Turn on supply, check ac power and ac bias
voltages at T1 secondary
Fan On?
Go to "No Display"
Troubleshooting
Fan on?
Yes
No No
Yes
Turn off the supply and remove top cover to access
the A1 board. Turn on the supply and check voltage
at heatsink of A1Q770 (TP 12) with respect to
common (TP 9). See Fig 6-5 Sheet 1.
No
Error message
displayed
?
Yes
See "Self Test Error
Codes/Messages",
Table 3-2
Yes
A1Q700 Heatsink
+24V?
1. Check ac bias voltage at T1
secondary and cable W7. See Fig
6-2 in 665xA service manual.
2. Check A1F700, 701, D702-
705, C711 and R709.
No
1. Check Fan B1 and cable connection to A1J601
2. Check fan speed control circuit A1Q700, A1U702
and associated components. See Fig 6-5 sheet 1.
Yes
Using front panel keys, program full
scale voltage and current. Check the
voltage at the supply’s output
terminals with a DMM.
Output voltage
within spec
?
No
B
To Sheet 4
No
A
To Sheet 2
Yes