SC5xx: Paper Feed and Fusing
D0CA/D0C9/D0C8/D0CB 6-46 SM
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
SC564-00 A Pressure Roller Thermistor (edge: center) (TH4) Overheat (Hardtware
Error)
Pressure Roller Thermistor (edge: center) (TH4) detects a temperature of 248
degrees C.
• Shorted triac
• Defective BiCU (PCB1)
• Defective fusing control system
1. Reconnect the connectors between the fusing drawer connector, BiCU
(PCB1), and Pressure Roller Thermistor (edge: center) (TH4).
2. Replace the Pressure Roller Thermistor (edge: center) (TH4) .
3. Replace the harnesses between the BiCU (PCB1) and Pressure Roller
Thermistor (edge: center) (TH4) .
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)
SC571-01 A Pressure Roller Thermistor (edge: rear) (TH3) Disconnection
SC571-11 D Pressure Roller Thermistor (edge: rear) (TH3) Disconnection (Low
Power)
Pressure Roller Thermistor (edge: rear) (TH3) detects a temperature of -20
degrees C or below for 29 consecutive seconds after the fusing lamp is
activated in a specified condition.
• Disconnected or defective Fusing Thermopile (TH1)
• Disconnected or defective Pressure Roller Thermistor (edge: rear) (TH3)
• Connector contact failure
1. Check the input voltage and replace the power plug (SC571-11 only).
2. Reconnect the connectors between the fusing drawer connector, BiCU
(PCB1), and Pressure Roller Thermistor (edge: rear) (TH3).
3. Replace the Pressure Roller Thermistor (edge: rear) (TH3).
4. Replace the harnesses between the BiCU (PCB1) and fusing unit.
5. Replace the BiCU (PCB1).
6. Replace the PSU (AC) (PCB17).
7. Replace the fusing unit if all the above steps cannot resolve the issue.
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