Is +5vdc present between pins 26 and 14 (GND) of CN7 on the main controller board?
NO
Disconnect connector CN7 on the main controller board from connector CN3 of the power
supply board, then reconnect these connectors.
YES
Is +8vdc present between pins 30 and 31 (GND) on connector CN7 on the main controller
board?
YES
Replace the main controller board.
NO
Verify that the main controller board and the power supply board are properly
connected.
Are the power supply board and the main controller board properly connected?
NO
Properly connect them.
YES
Measure the following voltages at connector CN2 on the power supply board.
Voltage between pin 1 and Frame Ground should be approximately 28vac.
Voltage between pin 5 and Frame Ground should be approximately 10vac.
Are the voltages normal?
NO
Go to
STEP-2.
YES
Is fuse F3 on the power supply board open?
YES
Replace fuse F3.
NO
Replace the power supply board.
STEP-2
Is the AC input voltage present between pins 1 and 2 of connector CN1 on the power supply board?
YES
Replace the AC transformer.
NO
Is fuse F1 or F2 on the power supply board open?
YES
Replace Fuse F1 or F2.
NO
Replace the power supply board.
Has the problem been resolved?
YES
End of procedure.
NO
Contact Technical Support.
Summary of Contents for OL400e Series
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