Ricoh B156 Service Manual page 199

No.
Definition
552 A Warm-up time over (pressure roller)
The main switch is turned on or a
cover is closed. → The fusing
pressure roller does not reach the
ready temperature within 200
seconds.
553 A Overheat error (pressure roller)
The pressure roller thermistor detects
165°C for 5 seconds.
554 A Low temperature error (pressure roller)
During standby or operation, the
pressure roller thermistor detects
60°C or less for 5 seconds.
555 A Full power error (pressure roller)
Fusing unit warm-up is complete.→
The fusing pressure roller stops
turning. → The pressure roller lamp
keeps outputting the maximum power
for 150 seconds.
556 A Unstable temperature (pressure roller)
The pressure roller thermistor detects
unstable temperature increases or
decreases within 60 seconds.
557 C Zero cross over error
The main switch is turned on; the
fusing relay turns on. → The detected
zero cross is out of the target range
(less than 45 or more than 65). →
The zero cross is detected more than
65 in ten cases out of eleven zero
cross detections.
570 A Fusing oil end
500 sheets of paper have been output
since oil end was detected.
571 A Fusing oil overflow
• The oil overflow sensor detects oil.
• When the machine covers are
closed, the oil supply unit is not
detected.
• When the machine covers are
closed, the fusing unit is not
detected.
572 D Oil overflow sensor error
The oil overflow sensor power is
turned off. → The oil overflow sensor
does not detect the oil overflow
condition.
SM
CÓPIA NÃO CONTROLADA
Symptom
4-9
CÓPIA NÃO CONTROLADA
Possible Cause
• Defective lamp (loose connection,
thermostat failure, PSU, thermostat)
• Incorrect detection (thermistor loose
connection, fusing - drawer loose
connection)
• Loose connection
• Defective BICU board
• Defective PSU
• Defective lamp (loose connection,
thermostat failure, PSU, thermostat)
• Incorrect detection (thermistor loose
connection, fusing - drawer loose
connection)
• Thermistor loose connection
• Fusing - drawer loose connection
• Thermistor loose connection
• Fusing - drawer loose connection
• Noise from a power supply line
• Insufficient oil (the oil tank in the rear of
the machine)
• Defective oil pipe
• Defective oil pump
• Defective oil end sensor
• Defective oil end sensor
• Defective oil overflow sensor
• Defective sensor cable
• Oil supply unit not installed
• Defective oil overflow sensor
• Defective harness
• Defective BICU
SERVICE CALL
B156/B220