Ricoh B082 Service Manual page 207

Code No.
544 A Fusing overheat error (hardware circuit
detection)
The dual monitoring circuitry of the
BICU detects extremely high
temperature and tripped the relay circuit
off.
545 A Fusing lamp remains on
After warm-up the fusing lamp remains
at full power for 10 seconds without the
hot roller rotating.
546 A Fusing ready temperature unstable
The fusing temperature is fluctuating.
547 B Zero cross signal malfunction
The applied power supply ac frequency
was detected at over 66Hz or below
45Hz, and the zero cross signals are
not detected within a certain period
within 500 ms after the main power
switch has been turned on.
548 A Fusing unit installation error
The machine cannot detect the fusing
unit when the front cover and right
cover are closed.
599 C 1-bin tray motor lock (optional 1-bin tray
unit)
A 1-bin tray motor lock signal is not
detected for more than 300 ms during
rotation.
601 C Communication error between BICU
and scanner unit
Within 800 ms after power on, after 3
attempts the BICU does not
communicate with the SIB via the serial
line.
610 C Communication timeout error between
BICU and ARDF
The BICU cannot receive a response
within 100 ms after 3 attempts after
sending data to the ARDF.
611 C Communication break error between
BICU and ARDF
The BICU receives a break signal from
the ARDF main board.
612 C Communication command error
between BICU and ARDF
The BICU sends a command to the
ARDF main board that it cannot
execute.
SM
Symptom
4-9
SERVICE CALL CONDITIONS
Possible Cause
Power supply unit defective
I/O board (IOB) defective
BICU defective
Fusing thermistor defective
Thermistor is out of position.
Thermistor connection loose
Fusing unit connector loose
Power supply board defective
Noise on the ac power line
Fusing unit is not installed
Fusing unit connection loose
1-bin tray motor locked from overload
1-bin tray motor defective
1-bin tray motor connection loose
Serial line connecting the BICU and SIB
defective
External noise on the serial line
SIB board defective
BICU board defective
BICU board and ARDF main board
serial line connection defective
External noise
ARDF main board defective
BICU board defective
Serial line connecting BICU and ARDF
unstable
External noise
ARDF main board defective
BICU board defective
Abnormal operation performed by
software
B079/B082