• Thermistor has short circuited
• Thermistor not positioned correctly
• Thermistor harness loose, broken, defective
• Thermistor defective
• IOB defective
SC557 D
Applied zero-cross waveform error
The applied power ac frequency was detected less than 66 Hz more than 10 times.
• Noise on the ac power supply line
SC559 A
Three consecutive fusing paper jam errors
Three consecutive paper jam errors occurred in the fusing unit.
Note: This SC code is not issued unless SP1159 is switched on.
• Paper jam in fusing unit
• Pick-off pawl defective
• Paper scraps in fusing unit
• Exit sensor defective
SC561 A
Pressure roller end 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
SC563 A
Pressure roller end thermistor error 2
The thermistor returned digital readings for the pressure roller during fusing
temperature control that were low (out of range).
• Thermistor connection loose, broken, defective
SC Tables
49
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