SERVICE CALL 26 July 2002
4-6
No.
Definition
Symptom Possible Cause
Discharge plate error 421
During discharging, the leakage
detection signal is low for 60
milliseconds.
• Short circuit in the discharge plate
• Defective high voltage supply board
• Defective harness (BICU - high voltage
supply board)
Transfer belt cleaning error 430 D
• Cleaning is operating at the
maximum PWM duty value for 60
milliseconds.
• Short circuit in the transfer belt cleaning
unit
• Defective high voltage supply board
• Defective harness (BICU - high voltage
supply board)
Main motor error 440 D
• The main motor starts or changes
speed. → The lock signal does not
continue for 1 second within 3
seconds.
• The main motor starts. → The lock
signal is detected and operation
proceeds normally. → The lock
signal is interrupted for 1 second.
• Defective main motor
• Too much load of the main motor drive
Temperature sensor error 460 D
The output is 4.5 V (or higher) or 0.3
V (or lower) for 12 seconds.
• Defective temp./ humidity sensor
• Defective circuit
• Defective connector
Humidity sensor error 461 D
The output is 4.5 V (or higher) or 0.3
V (or lower) for 12 seconds.
• Defective temp./ humidity sensor
• Defective circuit
• Defective connector
ID sensor error 480 D
The ID sensor is being calibrated
(process control, step 1) → While the
LED is off, the output voltage is 0.5 V
or lower.
• Defective ID sensor
• Defective connector
Transfer belt mark detection error 481 D
• The main motor is operating; and
the lock signal is detected. → The
belt mark sensor signal does not
change for 120 milliseconds.
• Defective main motor
• Image transfer belt out of position
• Belt mark blurred or absent
3rd tray error 503 B
• The tray lift motor turns on. → The
top of the paper stack is not
detected for 18 seconds.
• The tray is set. → The top of the
paper stack is detected. → The
bottom plate is lowered. → The
stack detection is not cleared within
7 seconds. → These steps are
repeated 4 times.
• Defective paper height sensor
• Defective tray lift motor
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