Ricoh TH-C1b, Руководство по обслуживанию

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10 February 2005 SERVICE CALL
4-9
Trouble-
shooting
No.
Definition
Symptom Possible Cause
Warm-up time over (pressure roller) 552 A
The main switch is turned on or a
cover is closed.
→
The fusing
pressure roller does not reach the
ready temperature within 200
seconds.
•
Defective lamp (loose connection,
thermostat failure, PSU, thermostat)
•
Incorrect detection (thermistor loose
connection, fusing - drawer loose
connection)
Overheat error (pressure roller) 553 A
The pressure roller thermistor detects
165°C for 5 seconds. •
Loose connection
•
Defective BICU board
•
Defective PSU
Low temperature error (pressure roller) 554 A
During standby or operation, the
pressure roller thermistor detects
60°C or less for 5 seconds.
•
Defective lamp (loose connection,
thermostat failure, PSU, thermostat)
•
Incorrect detection (thermistor loose
connection, fusing - drawer loose
connection)
Full power error (pressure roller) 555 A
Fusing unit warm-up is complete.
→
The fusing pressure roller stops
turning.
→
The pressure roller lamp
keeps outputting the maximum power
for 150 seconds.
•
Thermistor loose connection
•
Fusing - drawer loose connection
Unstable temperature (pressure roller) 556 A
The pressure roller thermistor detects
unstable temperature increases or
decreases within 60 seconds.
•
Thermistor loose connection
•
Fusing - drawer loose connection
Zero cross over error 557 C
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.
•
Noise from a power supply line
Fusing oil end 570 A
500 sheets of paper have been output
since oil end was detected.
•
Insufficient oil (the oil tank in the rear of
the machine)
•
Defective oil pipe
•
Defective oil pump
•
Defective oil end sensor
Fusing oil overflow 571 A
•
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.
•
Defective oil end sensor
•
Defective oil overflow sensor
•
Defective sensor cable
•
Oil supply unit not installed
Oil overflow sensor error 572 D
The oil overflow sensor power is
turned off.
→
The oil overflow sensor
does not detect the oil overflow
condition.
•
Defective oil overflow sensor
•
Defective harness
•
Defective BICU