Service manual

Service Call Conditions
SM 6-9 M052/M053/M054
Trouble-
shooting
SC5xx: Paper Feed and Fusing
500 B
Main motor lock
The machine does not detect motor lock signal for 250 ms during motor's
operating.
The machine does not detect motor lock signal for 1 second at rotating the
main motor.
 An obstruction has blocked operation of the main motor
 Main motor harness loose or broken
 Main motor or main motor driver board defective
530 D Exhaust fan error
531 D Duplex exhaust fan error
532 D PSU fan 1 error
533 D PSU fan 2 error
534 D AIO fan error
535 D Controller fan error
The motor lock signal error is detected for 2 seconds after the motor lock
signal was first detected.
 Disconnected or defective harness
 Defective each fan
541 A Fusing thermistor open (center)
The temperature of the hot roller remained below 0
o
C for 7 sec at the
center of the hot roller.
 Fusing thermistor out of its position because of incorrect installation
 Fusing thermistor disconnected or defective
542 A Fusing temperature warm-up error (center)