26 July 2002
SERVICE CALL
4-5
Trouble-
shooting
No.
Definition
Symptom Possible
Cause
Development error 2 (C/M)
351 D
A development process starts.
→
The
returning voltage exceeds the target
by 0.5 Volt or more for 60
milliseconds.
•
Short circuit in the development unit
•
Defective high voltage supply board
•
Defective harness (BICU - high voltage
supply board)
Development motor error
352 D
•
The development motor starts or
changes speed.
→
The motor does
not detect a 1-second lock signal
within 3 seconds.
•
The development motor starts.
→
The lock signal is detected during
normal operation.
→
The lock
signal is interrupted for 1 second or
more.
•
Defective development motor
1st transfer (image transfer) electric leakage (+)
400 D
Image transfer starts.
→
The process
operates at the minimum PWM duty
value. The returned current exceeds
1.8 V for 180 milliseconds.
•
Short circuit in the image transfer unit
•
Defective image transfer belt
•
Defective high voltage supply board
•
Defective harness (BICU - high voltage
supply board)
1st transfer (image transfer) electric leakage (–)
401 D
Image transfer starts.
→
The negative
(–) output is at the maximum PWM
duty value for 60 milliseconds.
•
Short circuit in the image transfer belt
•
Defective high voltage supply board
•
Defective harness (BICU - high voltage
supply board)
2nd transfer (paper transfer) electric leakage (+)
410 D
Paper transfer starts.
→
The positive
(+) output is at the minimum PWM
duty value.
→
The returning voltage
stays at 2.7 V or more for 60
milliseconds.
•
Short circuit in the paper transfer unit
•
Defective high voltage supply board
•
Defective harness (BICU - high voltage
supply board)
2nd transfer (paper transfer) electric leakage (–)
411 D
Paper transfer starts.
→
The negative
(–) output is at the minimum PWM
duty value.
→
The returning voltage
stays at 4.5 V or more for 60
milliseconds.
•
Short circuit in the paper transfer unit
•
Defective high voltage supply board
•
Defective harness (BICU - high voltage
supply board)
2nd transfer (paper transfer) disconnection (+)
412 D
Paper transfer starts.
→
The positive
(+) output is at the maximum PWM
duty value for 60 milliseconds.
•
Right cover not closed
•
Defective transfer roller contact
mechanism
•
Defective high voltage supply board
•
Defective harness (BICU - high voltage
supply board)
Discharge error (fusing bias)
420 D
The discharge circuit is operating at
the maximum PWM duty value for 60
milliseconds.
•
Fusing bias short circuit
•
Scratched fusing belt
•
Defective high voltage supply board
•
Defective harness (BICU - high voltage
supply board)
