10 August, 2001 SERVICE CALL CONDITIONS
7-5
Trouble-
shooting
Code No. Symptom Possible Cause
Paper tray error520 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 open541 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 error542 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 1543 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 2544 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 temperature546 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 malfunction547 B
Zero cross signals are not detected
within a certain period.
• Power supply board defective
•
SBCU board defective
Fusing unit set error548 A
The machine does not detect the fusing
unit.
• Poor connection of the fusing unit
•
The fusing unit is not installed
Exhaust fan motor error590 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
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