Ricoh B121 Service Manual page 148

SERVICE CALL CONDITIONS
No.
Definition
553 A Fusing overheat error (rear)
The fusing temperature is over 230°C
for 1 second (detected by the
thermistor).
555 A Fusing lamp overheat error (rear)
After the fusing temperature reaches
the target temperature, the fusing lamp
does not turn off for 20 consecutive
seconds.
556 A Unstable fusing temperature (rear)
The fusing temperature varies 50°C or
more within 1 second, and this occurs 2
consecutive times.
590 B Left exhaust fan motor error
The CPU detects an exhaust fan lock
signal for more than 5 seconds.
591 B Rear exhaust fan motor error
The CPU detects an exhaust fan lock
signal for more than 5 seconds.
620 B Communication error between BICU and ADF
The BICU does not receive a response
from the ADF main board for 4 seconds
or more.
The BICU receives a break signal from
the ADF main board.
621 B ADF connection error
An incorrect ADF (an ADF for some
other copier) is detected. (for Basic and
MFP machines)
An ADF (including the correct ADF) is
installed while the copier is in the
energy saver mode. (for MFP machine
only)
632 C Accounting error 1
An error is detected during the
communication with the MF accounting
device.
633 C Accounting error 2
After communication is established with
the MF accounting device, a brake
signal is issued.
634 C Accounting RAM error
An error is detected in the RAM that
saves the information on the MF
accounting.
635 B Accounting battery error
An error is detected in the battery that
is in the MF accounting device.
B121 Series/B259 Series
Symptom
4-6
Possible Cause
• Fusing thermistor defective
• Power supply board defective
• Fusing thermistor defective or out of
position
• Power supply board defective
• Thermistor defective or out of
position
• Power supply unit defective
• Loose connection of the exhaust fan
motor
• Too much load on the motor drive
• Loose connection of the exhaust fan
motor
• Too much load on the motor drive
• Poor connection between the BICU
and ADF main board (DF connector)
• ADF main board defective
• BICU defective
• ADF incorrect (The ADF for
B039/B040/B043 is installed on a
B121/B122/B123.)
• The connector of the ADF is removed
while the machine is in the energy
saver mode.
• Accounting device defective
• Loose connection
• Accounting device defective
• Loose connection
• Accounting device defective
• Accounting device defective
SM