Phaser 6121MFP Service Manual 3-73
Error Messages and Codes
004C Exhaust Fan Failure
The Ventilation Fan Motor does not rotate evenly even after the lapse of a given
period of time while it is starting.
Initial Actions
Power down and reboot the printer.
Procedure
Troubleshooting Reference Table
Applicable Parts Wiring and Plug/Jack References
■ Ventilation Fan Motor, PL7.2.20
■ Engine Control Board, PL13.0.20
■ Power Supply, PL13.0.17
■ Board Locations (page 2-10)
■ Motors, Fans, and Solenoids
(page 2-12)
■ Map 1 - Engine Control Board
Plug/Jack Locator (page 10-5)
■ Engine Control Board Wiring
(page 10-14)
Troubleshooting Procedure Table
Step Action and Questions Yes No
1 Check the Engine Control Board
connector P/J16.
Is the connector seated properly?
Go to step 2. Reseat the
connector. If
the problem
persists, go to
step 2.
2 Check the operation of the Ventilation
Fan Motor.
Is the motor faulty?
Replace the
motor
(page 8-95). If
the problem
persists, go to
step 5.
Go to step 5.
3 On the Engine Control Board, check for
+24 VDC at P/J2-1, 5, and 7. Check for
+5 VDC at P/J2-2.
Are the voltages present and within
specification?
Go to step 4. Replace the
Power Supply
(page 8-72). If
the problem
persists, go to
step 4.
4 Replace the Engine Control Board
(page 8-59).
Complete.
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