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SC CODES
SC
Item
Detection Conditions
No.
SC551 Pressure roller
- Timing -
thermistor
Every 1 second after the
open
fusing unit is installed
- Condition -
The pressure roller thermistor
output is almost close to 5V,
which corresponds to 0 °C, for
6 seconds continuously.
SC552 Pressure roller
- Timing & Condition -
warm-up error
The pressure roller thermistor
does not output an analog
value corresponding to the
ready temperature within 12
minutes after the main switch
is turned on.
Related
Possible Causes
SCs
• Fusing unit not
installed properly
• Poor connection of
connector
• Defective
thermistor
• Defective I/O
control board
• Defective main
control board
• Poor connection of
connectors
• Pressure roller
fusing lamp blown
• Pressure roller
thermofuse opened
• Blown fuse
• Power fluctuation
• Defective main
control board
• Defective I/O
control board
• Defective PSU
22
Troubleshooting Procedure
1. Check if the fusing unit is properly installed.
2. Check if the thermistor connector is properly
connected.
3. Replace the thermistor if it is deformed.
4. Replace the thermistor if it is opened by measuring the
resistance. (Refer to the Temperature/ Resistance
Conversion Reference Table at the end of this SC code
table.)
5. Replace the I/O control board.
6. Replace the main control board.
- Signals to Check -
• Thermistor: CN206-B4, TP230, or CN214-B2 on I/O
control board / CN302-B8 or TP156 on main control
board.
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
•
CN105 on the PSU
2. Replace the pressure roller fusing lamp if it is opened.
3. Replace the pressure roller thermofuse if it is opened.
4. Check if the power supplied from the outlet fluctuates.
5. Replace the main control board, I/O control board, or
PSU (check the trigger signal at each pin).
- Signals to Check -
• Pressure roller fusing lamp trigger: CN303-B7 on main
control board / CN218-B5, TP267, or CN205-A5 on I/O
control board / CN106-4 on PSU.
24 February 1999
Type
A
A
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