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10 August, 2001
SERVICE CALL CONDITIONS
7-5
Trouble-
shooting
Code No.
Symptom
Possible Cause
Paper tray error
520
B
An error occurs (i.e motor error, or
sensor error, etc) for any paper tray.
•
A defective motor
•
A defective sensor
•
Too much load on the drive
mechanism
Fusing thermistor open
541
A
The fusing temperature detected by the
thermistor was below 0
°
C for 5
seconds.
The fusing temperature does not rise
+15
°
C (center) or +12
°
C (at the ends)
five times within 2 minutes after the
fusing lamps have been turned on.
•
Fusing thermistor defective or out of
position
•
Fusing lamp open
•
Fusing thermostat open
•
Power supply board defective
•
Poor connection of the fusing unit
Fusing temperature warm-up error
542
A
The fusing temperature does not reach
the standby temperature within 20
seconds after the main switch is turned
on.
•
Fusing thermistor defective or out of
position
•
Fusing lamp open
•
Fusing thermostat open
•
Power supply board defective
•
Poor connection of the fusing unit
Fusing overheat error 1
543
A
A fusing temperature of over 231
°
C is
detected for 5 second by the fusing
thermistor.
•
Fusing thermistor defective
•
Power supply board defective
•
SBCU
board defective
Fusing overheat error 2
544
A
A fusing temperature of over 251
°
C is
detected by the fusing temperature
monitor circuit in the SBCU board.
•
Fusing thermistor defective
•
Power supply board defective
•
SBCU
board defective
Unstable fusing temperature
546
A
The fusing temperature varies 50
°
C or
more within 1 second twice
continuously.
•
Thermistor defective
•
Poor connection of the fusing unit
•
Power supply unit defective
Zero cross signal malfunction
547
B
Zero cross signals are not detected
within a certain period.
•
Power supply board defective
•
SBCU
board defective
Fusing unit set error
548
A
The machine does not detect the fusing
unit.
•
Poor connection of the fusing unit
•
The fusing unit is not installed
Exhaust fan motor error
590
B
The CPU detects an exhaust fan lock
signal for more than 5 seconds.
•
Poor connection of the exhaust fan
motor
•
Too much load on the motor drive
Communication break error between
SBCU and ADF
611
B
The SBCU receives a break signal from
the ADF main board.
•
Serial line connecting SBCU and
ADF unstable
•
External noise
•
ADF main board defective
•
SBCU board defective
Communication command error
between SBCU and ADF
612
B
The SBCU sends a command to the
ADF main board that it cannot execute.
•
SBCU board defective
•
Download SBCU firmware again