SC5xx: Paper Feed and Fusing
443
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
2. Replace the PSU (AC).
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
SC549-00 D Fusing Center Low Temperature
After passing 60 seconds when FGATE is ON, thermopile detects a temperature of -100
degrees C from the compensated target temperature for consecutive 60 seconds.
• Fusing lamp disconnection during paper passing
• Loose connector
1. Check the input voltage and reconnect the power cord.
2. Replace the fusing lamp.
3. Replace the fusing thermopile
4. Replace the BiCU.
5. Replace the PSU (AC).
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
SC554-00 A Fusing thermistor (NC sensor) detects high temperature (Hard)
Fusing thermistor (NC sensor) detects a temperature of 250 degrees C..
• Shorted triac
• Defective BiCU
• Defective fusing control system
Basically, the entire fusing unit must be replaced when SC554-00 occurs. For details, refer to
"Actions When SC544-00 or SC554-00 Occurs."
Do the following steps:
1. Inspect the fusing sleeve belt unit, and replace if damaged.
2. Reconnect the connector between the fusing unit and the BiCU.
3. Replace the fusing thermistor.
4. Replace the harness between the fusing unit and the BiCU.
5. Replace the BiCU.
6. Replace the PSU (AC).
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
SC557-00 C Zero cross frequency error
The frequency of the power source is 66Hz or more. This SC is detected just after the main
power is turned ON.
• Noise (High frequency)
• Defective PSU
1. Check the power supply source.
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