Printronix L1024, Руководство по обслуживанию

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13–37 Chapter 13 – Troubleshooting Guide
c. Replace the Fuser Sensor Board.
d. Replace the Stepper Motors Controller Board.
e. Replace the Engine Controller Board.
f. See the “General Fuser Cam Troubleshooting” section that follows.
General Fuser Cam Troubleshooting
With the top cover open, defeat the cover open switch and turn on the printer. Watch the fuser to see if it
closes, then opens, during the power-on sequence. If the fuser does not cycle, check the resistance of the
fuser cam motor. Disconnect the motor cable and measure the motor resistance. If the motor is open, it is
defective and must be replaced. Also, check the 24 V from the L.V.P.S.
1.The fuser cycles during power-up, but a “FUSER CAM” error still occurs.
a. The fuser cam motor signal is faulty.
1) Check the fuser cam sensor wheel for damage and replace it if necessary.
2) The fuser sensor board is faulty and must be replaced.
3) The cable from the fuser sensor board is faulty and must be replaced.
4) The Engine Controller Board is faulty and must be replaced.
2. The fuser does not cycle during power-up.
a. There is 24 V being supplied from the L.V.P.S. to the fuser cam motor.
1) The fuser cam motor is faulty and must be replaced.
2) The cable for the motor is faulty and must be replaced.
3) The fuser is binding and the motor cannot close the fuser. The fuser must be
replaced.
CAUTION: If the fuser is binding and, after installing a new motor, you hear
some severe gear grinding or motor binding noise while the motor
tries to close the fuser, the binding fuser will cause the motor to burn
out.
b. The L.V.P.S. is not supplying 24 V to the fuser cam motor. Check the OPC drum during
the power-up sequence to see if it turns. The 24 V is also supplied to the stepper
motor, causing the OPC drum to do a cleaning cycle during the power-up sequence. If
the OPC drum and stepper motor are turning, the power supply is probably good.
1) If the OPC drum is turning, replace the Engine Controller Board.
2) If the OPC drum does not turn, replace the L.V.P.S.
3) Replace the cabling between the L.V.P.S. and the fuser.
18 FUSER FAIL—Call Service
1. The sensor that detects the position of the Speed Control Paper Guide is defective.
a. Replace the sensor for the Speed Control Paper Guide.
b. Replace the Speed Control Paper Guide.
23 THRMISTR FAIL—Call Service
1. The thermistor in the fuser is open, or one of its leads or associated wires is broken.
a. Inspect the thermistor leads and associated wiring. Repair any wiring problems found.