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SC CODES
SC
Item
Detection Conditions
No.
SC555 Pressure roller
- Timing -
ready
Every 1 second after the
temperature
temperature reaches the
abnormal
ready condition
- Condition -
The pressure roller thermistor
output does not reach the
ready temperature within 7
minutes continuously.
SC557 Pressure roller
- Timing -
temperature
Every 1 second, 2 minutes
does not
after the main switch turned
increase
on until the roller temperature
reaches the ready condition
- Condition -
The pressure roller
temperature does not increase
by more than 3 °C for a
minute during warm-up.
Related
Possible Causes
SCs
Same as SC553
• Poor connection of
connectors
• Pressure roller
fusing lamp brown
• Pressure roller
thermofuse opened
• Defective main
control board
• Defective I/O
control board
24
Troubleshooting Procedure
Same as SC553
1. Check if the following connectors are properly
connected:
•
Pressure roller fusing lamp connectors
•
CN303 on the main control board
•
CN206 and CN214 on the I/O control board
2. Replace the pressure roller fusing lamp if it is opened.
3. Replace the pressure roller thermofuse if it is opened.
4. Replace the main control board, I/O control board, or
by checking the trigger signal at each pin.
- Signals to Check -
• Pressure roller fusing trigger: CN303-B7 on main
control board / CN218-B5, or CN205-A5 on I/O control
board.
24 February 1999
Type
A
A
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