Ricoh B079 - Page 207

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