SC5xx: Paper Feed and Fusing
SM 6-43 D0CA/D0C9/D0C8/D0CB
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
SC549-00 D Fusing Center Low Temperature
After passing 60 seconds when FGATE is ON, the Fusing Thermopile (TH1)
detects a temperature of -100 degrees C from the compensated target
temperature for consecutive 60 seconds.
• Fusing lamp disconnection during paper passing
• Loose connector
1. Check the power supply voltage and reconnect the cable to the outlet.
2. Replace the Fusing Thermostat.
3. Replace the Fusing Sleeve Belt Assembly (fusing lamp).
4. Replace the Fusing Thermopile (TH1)
5. Replace the BiCU (PCB1).
6. Replace the PSU (AC) (PCB17).
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
SC554-00 A Fusing Thermistor (non-contact sensor) (S10) High Temperature Error
(Hardware Error)
Fusing Thermistor (non-contact sensor) (S10) detects a temperature of 250
degrees C..
• Shorted triac
• Defective BiCU (PCB1)
• Defective fusing control system
Basically, the entire fusing unit must be replaced when SC554-00 occurs. For
details, refer to "Actions When SC554-00 Occurs."
Do the following steps:
1. Inspect the Fusing Sleeve Belt Assembly.
If the fusing sleeve belt assembly is torn or exhibits any other damage,
replace it. Otherwise, proceed to next step.
2. Reconnect the connector between the fusing unit and BiCU (PCB1).
3. Replace the Fusing Thermistor (non-contact sensor) (S10).
4. Replace the harness between the fusing unit and BiCU (PCB1).
5. Replace the BiCU (PCB1).
6. Replace the PSU (AC) (PCB17).
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