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Troubleshooting
To check out the oscilloscope
8
Is the fan running?
The low voltage power supply has a thermal cut-out circuit. If the fan is
defective, the low voltage power supply will shut down when it gets too hot for
safe operation.
If the fan is running, perform the internal self-tests. Go to “To run the internal
self-tests” on page 5-13.
If the fan is not running, it may be defective. Follow these steps:
a Disconnect the fan cable from the power supply.
b Measure the fan voltage at the connector on the power supply.
See Figure 5-2 for the location of the fan connector.
c If the fan voltage is approximately +8 Vdc, replace the fan. If the fan voltage
is not approximately +8 Vdc, replace the power supply.
Figure 5-2
Location of the Fan Connector
+5.1 / -5.2 V
Balance Adjustment
Fan Connector Printer Power
+3.3V Adjustment
service.book Page 10 Wednesday, December 18, 2002 8:35 AM