Ricoh B121 Service Manual page 145

No.
Definition
145 D Automatic SBU adjustment error
During the automatic SBU adjustment,
the machine detects that the white level
read from the white plate or paper is
out of range. (
193 B Image transfer error
Scanned images are not transferred to
the controller memory within 1 minute.
198 B Memory address error
The BICU board does not receive
memory addresses from the controller
board.
302 B Charge roller current leak
A current leak signal for the charge
roller is detected.
320 B Polygonal mirror motor error
The polygon mirror motor does not
reach operating speed within 10
seconds after the motor ON signal is
sent, or does not turn on within one of
the 200 ms check intervals during
operation.
321 C No laser writing signal (F-GATE) error
The laser writing signal (F-GATE) fails
to turn Low after the laser crosses 5
mm on the drum surface from the laser
writing start position.
322 B Laser synchronization error
The main scan synchronization
detector board cannot detect the laser
synchronization signal for more than 5
consecutive 100 ms intervals.
390 B TD sensor error
The TD sensor outputs less than 0.2 V
or more than 4.0 V 10 times
consecutively during copying.
391 B Development bias leak
A development bias leak signal is
detected.
SM
Symptom
SP4-428)
4-3
SERVICE CALL CONDITIONS
Possible Cause
• Exposure lamp defective
• Dirty white plate
• Incorrect position or width of white
plate scanning ( SP4-015)
• BICU board defective
• SBU board defective
• BICU board defective
• Controller board defective
• The firmware programs of the engine
and the controller do not match.
• BICU board defective
• Controller board defective
• Charge roller damaged
• High voltage supply board defective
• Poor connection of the PCU
• Polygon mirror motor defective
• Poor connection between the
polygonal mirror motor driver and the
BICU board
• Damaged cable between BICU and
polygonal mirror motor driver
• BICU board defective
• BICU board defective
• The fax controller or printer controller
has a poor connection
• Fax controller or printer controller
defective
• Poor connection between the LD unit
and the BICU board
• Damaged cable between BICU and
LD unit
• LD unit out of position
• LD unit defective
• BICU board defective
• TD sensor abnormal
• Poor connection of the PCU
• Poor connection of the PCU
• High voltage supply board defective
B121 Series/B259 Series