Ricoh Aficio Color 4006, Руководство по обслуживанию

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SC CODES 24 February 1999
14
SC
No.
Item Detection Conditions Possible Causes
Related
SCs
Troubleshooting Procedure Type
SC440 Drum motor
error
- Timing & Condition -
•
The feedback signal from
the motor is still out of
range 1 second after the
trigger signal is sent.
•
The feedback signal
becomes out of range for 2
seconds while the trigger
signal is on.
•
Poor connection of
connector
•
Defective drum
motor
•
Defective I/O
control board
•
Defective main
control board
1. Check if the drum is locked by the cleaning blade. If it
is, replace the cleaning blade.
2. Check if the connector (CN223) on the I/O control
board is properly connected.
3. Check if the drum motor works properly using SP 5-
804-001 to 004. If not, replace the drum motor.
4. Replace the I/O control board.
5. Replace the main control board.
- Signals to Check -
•
Motor OK: CN223-B5 or TP295 on the I/O control
board
D
SC450 Paper transfer
bias current
error
- Timing -
When the paper transfer bias
is on during printing
- Condition -
The feedback voltage is 4.8V
or higher (indicating a leak), or
PWM value is 50% or higher
for 500 ms continuously.
•
Defective high
voltage supply
(T2,D)
•
Defective I/O
control board
•
Defective main
control board
1. Check if the connectors of high voltage cables and
trigger lines are properly connected on the high voltage
supply board (T2,D), I/O control board, and main
control board.
2. Replace the high voltage supply board (T2,D).
3. Replace the I/O control board.
4. Replace the main control board.
- Signals to Check -
•
Feedback signal: CN227-A3, TP220, or CN214-A3 on
I/O control board / CN302-A7 or TP105 on the main
control board
•
PWM: CN227-A4 or TP208 on I/O control board
D