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24 February 1999
SC
Item
Detection Conditions
No.
SC553 Pressure roller
- Timing -
overheat
Every 1 second when the
fusing unit is installed
- Condition -
The pressure roller thermistor
output is lower than about
0.3V, which corresponds to
220 °C, for 3 seconds
continuously.
SC554 Pressure roller
- Timing -
low limit
Every 1 second after warm-up
temperature
is completed
detected
- Condition -
The pressure roller thermistor
output is higher than about 3
V, which corresponds to
87 °C, for 8 seconds
continuously after warm-up is
completed.
Related
Possible Causes
SCs
• Fusing unit not
installed properly
• Poor connection of
connector
• Defective
thermistor
• Defective I/O
control board
• Defective main
control board
• Defective PSU
Same as SC553
23
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 main control board, I/O control board, or
PSU (check the output from the thermistor and the
trigger signal at each pin).
- Signals to Check -
• Thermistor: CN206-B4, TP230, or CN214-B2 on I/O
control board / CN302-B8 or TP156 on main control
board.
• Pressure roller fusing trigger: CN303-B7 on main
control board / CN218-B5, TP267, or CN205-A5 on I/O
control board /CN106-4 on PSU.
Same as SC553
SC CODES
Type
A
A
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