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SC CODES
SC
Item
Detection Conditions
No.
SC543 Hot roller
- Timing -
fusing lamp
Every 1 second when the
overheat
fusing unit is installed
- Condition -
The hot roller thermistor
output is lower than about
0.3V, which corresponds to
220 °C, for 3 seconds
continuously.
SC544 Hot roller
- Timing -
fusing lamp
Every 1 second after warm-up
lower limit
is completed
temperature
detected
- Condition -
The hot roller thermistor
output is higher than about
3V, which corresponds to 87
°C, for 8 seconds continuously
after warm-up is completed.
Related
Possible Causes
SCs
• Fusing unit not set
properly
• Poor connection of
connector
• Defective
thermistor
• Defective I/O
control board
• Defective main
control board
• Defective PSU
Same as SC543
20
Troubleshooting Procedure
1. Check if the fusing unit is properly instaled.
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-B9, TP231, or CN214-B1 on I/O
control board / CN302-B9 or TP154 on main control
board.
• Hot roller fusing trigger: CN303-B6 on main control
board / CN205-A4, TP267, or CN218-B6 on I/O control
board / CN106-5 on PSU.
Same as SC543
24 February 1999
Type
A
A
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