SC5xx: Paper Feed and Fusing
D0CA/D0C9/D0C8/D0CB 6-50 SM
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
SC593-00 A Pressure Roller Thermistor (edge: front) (TH2) High Temperature
(Software Error)
Pressure Roller Thermistor (edge: front) (TH2) detects a temperature of 248
degrees C for consecutive 10 times when the fusing lamp is activated.
• Shorted triac
• Defective BiCU (PCB1)
1. Reconnect the connectors between the fusing unit, fusing drawer
connector, and BiCU (PCB1).
2. Replace the Pressure Roller Thermistor (edge: front) (TH2).
3. Replace the harnesses between the BiCU (PCB1) and Pressure Roller
Thermistor (edge: front) (TH2)
4. Replace the BiCU (PCB1).
5. Replace the fusing unit if all the above steps cannot resolve the issue.
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
SC594-00 A Pressure Roller Thermistor (edge: front) (TH2) High Temperature
(Hardware Error)
Pressure Roller Thermistor (edge: front) (TH2) detects a temperature of 248
degrees C.
• Shorted triac
• Defective BiCU (PCB1)
• Defective fusing control system
1. Reconnect the connectors between the fusing unit, fusing drawer
connector, and BiCU (PCB1).
2. Replace the Pressure Roller Thermistor (edge: front) (TH2).
3. Replace the harnesses between the BiCU (PCB1) and Pressure Roller
Thermistor (edge: front) (TH2).
4. Replace the BiCU (PCB1).
5. Replace the fusing unit if all the above steps cannot resolve the issue.
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