Ricoh Neptune-P1 Service Manual page 198

During the hot roller temperature control
sequence, or while the hot roller and
pressure roller were rotating, the
pressure roller center thermistor
measured a value higher than 3.3V 10
consecutive times at 600 ms intervals.
553 A Pressure roller center thermistor error 2
During the hot roller temperature
control sequence, the pressure roller
center thermistor measures a value
lower than 0.2V.
557 C Applied zero-cross waveform error
The applied power ac frequency was
detected less than 66 Hz more than 10 times.
559 A 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.
561 A Pressure roller end thermistor error 1
During the hot roller temperature control
sequence, or while the hot roller and
pressure roller were rotating, the end
thermistor on the pressure roller returned
a digital reading of more than 3.3V.
• Pressure roller center thermistor not
positioned properly
• Pressure roller center thermistor connector
loose, broken, defective
• Pressure roller center thermistor defective
• MCU defective
• Pressure roller center thermistor not positioned
properly
• Pressure roller center thermistor connector
loose, broken, defective
• Pressure roller center thermistor defective
• MCU defective
• Noise on the ac power supply line
• Paper jam in fusing unit
• Pick-off pawl defective
• Paper scraps in fusing unit
• Exit sensor defective
• Pressure roller end thermistor not positioned
properly
• Pressure roller end thermistor connector
loose, broken, defective
• Pressure roller end thermistor defective
• MCU defective
SC Code Descriptions
4
197