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24 February 1999
SC
Item
Detection Conditions
No.
SC452 Transfer belt
- Timing & Condition-
mark detection
The main control board does
error
not receive the belt mark
detection signal from the
transfer belt home position
sensor for a certain period.
SC456 Paper transfer
- Timing & Condition
• The paper transfer home
unit position
error
position sensor does not
detect the paper transfer
unit moving into the
contact position or the
release position at the
correct time.
SC457 Image transfer
- Timing & Condition
• The belt cleaning home
belt cleaning
unit position
position sensor does not
error
detect the transfer belt
cleaning unit moving into
the contact position or the
release position at the
correct time.
Related
Possible Causes
SCs
• Dirty or damaged
belt mark
• Belt mark out of
position
• Defective sensor
• Defective I/O
control board
• Defective main
control board
• Defective paper
transfer positioning
clutch
• Defective I/O
control board
• Dirty sensor
• Defective sensor
• Defective belt
cleaning clutch
• Defective I/O
control board
• Defective main
control board
15
Troubleshooting Procedure
1. Check if the transfer belt release lever is properly set.
2. Clean the belt mark if it is dirty.
3. Replace the transfer belt if a belt mark has peeled off
or is damaged.
4. Clean the transfer belt home position sensor if it is
dirty.
5. Replace the transfer belt home position sensor.
6. Replace the I/O control board.
7. Replace the main control board.
- Signals to Check -
• Sensor: CN223-A6, TP210, or CN218-B11 on I/O
control board / CN303-B1 or TP137 on the main control
board.
1. Replace the paper transfer H.P. sensor. (Input Check:
SP 5-803-11)
2. Replace the paper transfer positioning clutch. (Output
Check: SP 5-804-23)
3. Replace the I/O control board.
- Signals to Check -
• H.P.: CN229-5 or TP286 on I/O control board
1. Pull out and re-insert the image transfer belt unit.
2. Clean the belt cleaning H.P. sensor if it is dirty.
3. Replace the sensor. (Input Check: 5-803-12)
4. Replace the belt cleaning clutch. (Output Check: SP 5-
804-36)
5. Replace the I/O control board.
6. Replace the main control board.
- Signals to Check -
• H.P.: CN202-2 or TP254 on I/O control board
SC CODES
Type
D
D
D
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