SC5xx: Paper Feed and Fusing
445
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
3. Replace the fusing lamp.
4. Replace the thermistor.
5. Replace the BiCU.
6. Replace the PSU (AC).
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
SC563-00 A Pressure roller overheat (software error): Center
Pressure roller thermistor (center) detects a temperature of 248 degrees C 10 times after the
fusing relay is ON.
• Shorted triac
• Defective BiCU
1. Reconnect the connectors between the fusing drawer connector, BiCU, and the pressure
roller thermistor.
2. Replace the thermistor.
3. Replace the harnesses between the BiCU and pressure roller thermistor.
4. Replace the BiCU.
5. Replace the fusing unit if all the above steps cannot resolve the issue.
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
SC564-00 A Pressure roller overheat (hardware error): Center
Pressure roller thermistor (center) detects a temperature of 248 degrees C.
• Shorted triac
• Defective BiCU
• Defective fusing control system
1. Reconnect the connectors between the fusing drawer connector, BiCU, and the pressure
roller thermistor.
2. Replace the thermistor.
3. Replace the harnesses between the BiCU and pressure roller thermistor.
4. Replace the BiCU.
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 (rear) disconnection
SC571-11 A Pressure roller thermistor (rear) disconnection (low power)
Pressure roller thermistor (rear) detects a temperature of -20 degrees C or less for 20
consecutive seconds after the fusing lamp is activated in a specified condition.
• Thermistor disconnection
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