SC5xx: Paper Feed and Fusing
447
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
• Replace the fusing unit if all the above steps cannot resolve the issue.
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
SC574-00 A Pressure roller (rear) overheat (hardware error)
Pressure roller thermistor (rear) detects a temperature of 248 degrees C.
• Shorted triac
• Defective BiCU
• Defective fusing control system
1. Reconnect the connectors between the fusing drawer connector, the BiCU, and the
pressure roller thermistor.
2. Replace the thermistor.
3. Replace the harnesses between the BiCU and the pressure roller thermistor.
4. Replace the BiCU.
• Replace the fusing unit if all the above steps cannot resolve the issue.
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
SC581-01 A Fusing thermistor disconnection
SC581-02 A Shorted fusing thermistor
SC581-11 D Fusing thermistor disconnection (low power)
SC581-12 D Shorted fusing thermistor (low power)
The machine detects the value of AD is the prescribed value for 0.2 consecutive seconds after
the fusing lamp is activated
• Thermopile disconnection (SC581-01)
• Shorted fusing thermistor (SC581-02)
• Loose connector
1. Check the input voltage and replace the power plug (SC581-11/-12).
2. Reconnect the connectors between the fusing unit, fusing drawer connector, and BiCU.
3. Replace the fusing thermistor.
4. Replace the fusing unit.
5. Replace the harnesses between the BiCU and the fusing drawer connector.
6. Replace the BiCU.
7. Replace the PSU (AC).
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
SC591-01 A Pressure roller thermistor (front) disconnection
SC591-11 D Pressure roller thermistor (front) disconnection (low power)
Pressure roller thermistor (front) detects a temperature of -20 degrees C or less for 20
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