26 July 2002 SERVICE CALL
4-9
Trouble-
shooting
No.
Definition
Symptom Possible Cause
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
ADF communication error 620 D
The ADF has been detected. → A
communication error has occurred.
• Loose connection
• Defective ADF
• Defective BICU board
• Defective scanner I/O board
• External noise
CSS communication error 630 C
The machine tries to communicate
with one of the terminals of a relevant
service center. → An error signal
returns.
• Communication error on the public
telephone network (logged only; the
machine can still operate)
MF accounting device error 1 632 D
The machine sends a data frame. →
No normal end signal returns. → This
symptom happens three times.
• Defective or broken line between
machine and device
MF accounting device error 2 633 D
The machine is communicating with
the accounting device. → The break
signal returns.
• Defective or broken line between
machine and device
MF accounting device error 3 634 D
A backup RAM error is reported from
the accounting device.
• Defective accounting device controller
• Defective battery in the accounting
device
MF accounting device error 4 635 D
A battery voltage error is reported
from the accounting device.
• Defective accounting device controller
• Defective battery in the accounting
device
Engine-to-controller communication checksum error 640 C
While the BICU and controller are
communicating, a checksum error
has occurred.
• Logged only; the machine can still
operate
Engine-to-controller response error 641 D
The controller has sent a frame with
the RAPI protocol, but the engine
does not respond.
• Defective controller board
• External noise
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