SC5xx: Paper Feed and Fusing
442
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
3. Replace the fusing lamp.
4. Replace the fusing thermopile.
5. Replace the BiCU.
6. Replace the PSU (AC)
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.
This SC is detected when:
• The main power is turned on.
• The machine returns from the engine-off mode.
• The interlock switch is deactivated.
• Damaged fusing relay
• Fusing relay drive circuit failure
1. Make sure that the harness between the PSC (AC) and BiCU is firmly connected.
2. Replace the PSU (AC).
3. Replace the BiCU.
SC547-02 D Zero cross error: fusing lamp relay contact defective
Zero cross signal cannot be detected if the fusing relay is activated.
This SC is detected when:
• The main power is turned on.
• The machine returns from the engine-off mode.
• The interlock switch is turned off or on.
• Broken fusing relay (open circuit)
• Fusing relay circuit failure
• PSU fuse (24VS) worn out
1. Make sure that the harness between the PSU (AC) and BiCU is firmly connected.
2. Replace the PSU (AC).
3. Replace the BiCU.
4. Replace the harness between the PSU (AC) and BiCU.
SC547-03 D Zero cross error: low frequencies error
The frequency of the power source is lower than 44Hz.
This SC is detected when the main power is ON.
• 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.
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