Ricoh B286 Service Manual page 228

SC Code Descriptions
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.
B286/B289
! 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
4-10 SM