• Fusing lamp harness loose, broken, defective
• IOB defective
SC546 A
Unstable fusing temperature
Fusing temperature fluctuated more than 20°C (68°F) within 1 sec. more than 7
times during the previous 60 sec. of fusing temperature control.
• Thermistor disconnected
• Thermistor out of position, not in contact with hot roller
• Thermistor connection loose, broken, defective
SC547 D
Zero-cross signal error
One of the following conditions occurred:
• No zero-cross signal detected within 50 ms after the machine was powered
on with Relay 0 off, or abnormal zero-cross detected 3 times.
• No zero-cross signal detected for 3 sec. after fusing relay turned on after power
on.
• Abnormal mains frequency was detected more than 10 times.
• Electrical noise on the power line
• PSU power relay defective.
SC551 A
Pressure roller center thermistor error 1
The thermistor returned temperature readings less than 5°C (41°F) for 12 sec.
during fusing temperature control while the hot roller and pressure rollers were
rotating
• Thermistor connection loose, broken, defective
• Thermistor floating free, not positioned correctly
• Thermistor defective
• IOB defective
SC553 A
Pressure roller center thermistor error
During fusing temperature control the thermistor at the center of the pressure roller
returned an abnormally low reading.
5. Appendix: Service Call Conditions
48
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