Ricoh TH-C1b Service Manual page 172

10 February 2005
No.
Definition
352 D Development motor 1 error
• Development motor 1 changes its
speed from half to normal.
1) Motor 1 does not detect a 0.3-
second lock signal within 0.9
seconds.
2) Motor 1 does not detect the
lock signal for 0.3 seconds
after it detected a 0.3-second
lock signal before.
• The development motor starts
3) Motor 1 does not detect a 1-
second lock signal within 3
seconds.
4) Motor 1 does not detect the
lock signal for 0.3 seconds
after it detected a 1-second
lock signal before.
353 D Development motor 2 error
• Development motor 2 changes its
speed from half to normal.
3) Motor 2 does not detect a 0.3-
second lock signal within 0.9
seconds.
4) Motor 2 does not detect the
lock signal for 0.3 seconds
after it detected a 0.3-second
lock signal before.
• The development motor starts
5) Motor 2 does not detect a 1-
second lock signal within 3
seconds.
6) Motor 2 does not detect the
lock signal for 0.3 seconds
after it detected a 1-second
lock signal before.
401 D 1st transfer (image transfer) circuit open
The returning voltage N from the
image transfer unit is detected for 60
ms.
N ≥ 1/2 output value
410 D 2nd transfer (paper transfer) electric leakage (+)
Paper transfer starts. → The positive
(+) output is at the minimum PWM
duty value. → The returning voltage
does not reach 4.29 V or less for 60
milliseconds.
411 D 2nd transfer (paper transfer) electric leakage (–)
Paper transfer starts. → The negative
(–) output is at the minimum PWM
duty value. → The returning voltage
stays at 4.75 V or more for 60
milliseconds.
Symptom
4-5
Possible Cause
• Defective development motor (Y & M)
• Too much load on the development unit
(Y & M)
• Defective harness connection
• Defective development motor (K & C)
• Too much load on the development unit
(K & C)
• Defective harness connection
• Open circuit in the image transfer belt
• Defective high voltage supply board
• Defective harness (BICU - high voltage
supply board)
• Short circuit in the paper transfer unit
• Defective high voltage supply board
• Defective harness (BICU - high voltage
supply board)
• Short circuit in the paper transfer unit
• Defective high voltage supply board
• Defective harness (BICU - high voltage
supply board)
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