Phaser 6121MFP Service Manual 3-77
Error Messages and Codes
0300 Laser Motor Failure and 0310 Laser Unit Failure
Possible causes:
• The Polygon Motor does not rotate evenly even after the lapse of a given
period of time after it has been started.
• The motor lock signal remains HIGH for a given period of consecutive time
while the Polygon Motor is being rotated.
• The SOS signal is not detected within a given period of time after the output
of the laser has been started.
Initial Actions
Power down and reboot the printer.
Procedure
4 Check the 2nd Image Transfer
Retraction Position Solenoid for proper
drive coupling and correct as
necessary.
Does the problem persist?
Go to step 5. Complete.
5 Check the 2nd Image Transfer
Retraction Position Sensor control
signal for a voltage change at P/J12-3
on the Engine Control Board.
Is the signal operating correctly?
Go to step 6. Replace the
Engine Control
Board
(page 8-59). If
the problem
persists, go to
step 6.
6 Replace the 2nd Image Transfer
Retraction Position Solenoid.
Does the problem persist?
Go to step 7. Complete.
7 Replace the 2nd Image Transfer
Retraction Position Sensor.
Complete.
Troubleshooting Reference Table
Applicable Parts Wiring and Plug/Jack References
■ Laser Unit, PL4.0.13
■ Engine Control Board, PL13.0.20
■ Power Supply, PL13.0.17
■ Board Locations (page 2-10)
■ Map 1 - Engine Control Board
Plug/Jack Locator (page 10-5)
■ Engine Control Board Wiring
(page 10-14)
Troubleshooting Procedure Table (continued)
Step Action and Questions Yes No
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