SC5xx: Paper Feed and Fusing
D0CA/D0C9/D0C8/D0CB 6-42 SM
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
SC547-01 D Zero Cross Error (Fusing lamp relay contact welding)
Zero cross signal is detected when the fusing relay is deactivated.
• Damaged fusing relay
• Fusing relay drive circuit failure
1. Make sure that the harness between the PSU (AC) (PCB17) and BiCU
(PCB1) is firmly connected.
2. Replace the PSU (AC) (PCB17).
3. Replace the BiCU (PCB1).
SC547-02 D Zero Cross Error (Fusing lamp relay contact defective)
Zero cross signal cannot be detected if the fusing relay is activated.
• Broken fusing relay (open circuit)
• Fusing relay circuit failure
• PSU fuse (24VS) worn out
1. Make sure that the harness between the PSU (AC) (PCB17) and BiCU
(PCB1) is firmly connected.
2. Replace the PSU (AC) (PCB17).
3. Replace the BiCU (PCB1).
4. Replace the harness between the PSU (AC) (PCB17) and BiCU (PCB1).
SC547-03 D Zero Cross Error (Low frequencies error)
The frequency of the power source is lower than 44Hz.
Unstable frequency
1. Check the frequency is 45Hz or more.
If not, the power supply from the wall socket may be the cause. Ask for
your supervisor or the electrician in charge at the site.
2. Replace the PSU (AC) (PCB17).
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