Ricoh Russian-C2a Service Manual page 291

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