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547
Zero cross error
• The zero cross signal is detected three times even though the fusing lamp relay is off when
turning on the main power.
• The zero cross signal is not detected for 3 seconds even though the fusing lamp relay is
on after turning on the main power or closing the front door.
• The detection error occurs twice or more in 11 zero cross signal detections. This error is
defined when the detected zero cross signal is less than 45.
• The zero cross signal is not detected three times while the main power remains ON.
• Defective fusing relay
• Defective fusing relay circuit
•
Shorted +24V fuse on the PSU
• Unstable power supply.
1. Check the power supply source.
2. Replace the +24V fuse on the PSU.
3. Replace the PSU
557
Zero cross frequency error
The zero cross signal is detected ten times while the fusing lamp relay remains ON after turning
on the main power.
• Defective fusing lamp relay
• Defective drive circuit of the fusing lamp relay
•
Unstable input power source
1. Check the power supply source.
2. Replace the fusing unit.
• Execute "Fuser SC Reset" to recover the machine after completing the recovery procedure.
Otherwise, the machine continues to issue this SC code and cannot be operated.
6. Troubleshooting
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