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SC CODES
SC
Item
Detection Conditions
No.
SC440 Drum motor
- Timing & Condition -
• The feedback signal from
error
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.
SC450 Paper transfer
- Timing -
bias current
When the paper transfer bias
error
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.
Related
Possible Causes
SCs
• Poor connection of
connector
• Defective drum
motor
• Defective I/O
control board
• Defective main
control board
• Defective high
voltage supply
(T2,D)
• Defective I/O
control board
• Defective main
control board
14
Troubleshooting Procedure
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
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
24 February 1999
Type
D
D
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