SC5xx: Paper Feed and Fusing
SM 6-41 D0CA/D0C9/D0C8/D0CB
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
SC544-00 A Fusing Thermopile (TH1) Overheat (Hardware Error)
Fusing Thermopile (TH1) detects a temperature of 250 degrees C.
• Triac short
• Defective BiCU (PCB1)
• Defective fusing control system
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 Thermopile (TH1).
4. Replace the harness between the fusing unit and BiCU (PCB1).
5. Replace the BiCU (PCB1).
6. Replace the PSU (AC) (PCB17).
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
SC545-01 A Fusing Lamp Consecutive Full Power
SC545-11 D Fusing Lamp Consecutive Full Power (Low Power)
This SC occurs if the fusing lamp keeps operating consecutively at full power
for longer than the specified length of time.
• Disconnected or defective Fusing Thermopile (TH1)
• Broken fusing lamp
1. Check to see if there is paper remaining in the fusing unit.
2. Check the input voltage and replace the power plug (SC545-11 only).
3. Replace the Fusing Thermostat.
4. Replace the Fusing Sleeve Belt Assembly (fusing lamp).
5. Replace the Fusing Thermopile (TH1).
6. Replace the BiCU (PCB1).
7. Replace the PSU (AC) (PCB17)
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