Ricoh U-C1 B051 - Page 156

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)