Error Messages and Codes 3-33
Fan Failure, Code 48
The machine logic detected a failure of the Fuser fan, LVPS fan, or rear fan.
Troubleshooting References
Applicable Parts Wiring and Plug/Jack Map References
■ Fuser Fan
■ LVPS Fan
■ Rear Fan
Troubleshooting Procedure
Step Actions and Questions Yes No
1
1. Enter service diagnostics and run the
fan test.
2. Does the fuser fan rotate at a high
speed?
Go to step 4. Go to step 2.
2
1. Check for voltage at J222-4.
2. Does the voltage measure +24 VDC?
Go to step 3. Check the wiring
to the fuser fan, if
the wiring is OK,
replace the
engine control
board.
3
Does the front panel indicate the fans are
ON?
Replace the fan. Check the wiring
to the fuser fan, if
the wiring is OK,
replace the
engine control
board.
4
Does the rear fan revolve at high speed? Go to step 7. Go to step 5.
5
1. Check for voltage at J552-1.
2. Does the voltage measure +24 VDC?
Go to step 6. Check the wiring
to the rear fan, if
the wiring is OK
replace the
interface board. If
the problem
continues,
replace the
engine control
board.
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