Ricoh TH-C1b, Руководство по обслуживанию

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10 February 2005 SERVICE CALL
4-5
Trouble-
shooting
No.
Definition
Symptom Possible Cause
Development motor 1 error 352 D
•
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.
•
Defective development motor (Y & M)
•
Too much load on the development unit
(Y & M)
•
Defective harness connection
Development motor 2 error 353 D
•
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.
•
Defective development motor (K & C)
•
Too much load on the development unit
(K & C)
•
Defective harness connection
1st transfer (image transfer) circuit open 401 D
The returning voltage N from the
image transfer unit is detected for 60
ms.
N
≥ 1/2 output value
•
Open 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
does not reach 4.29 V or less 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 4.75 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)