Ricoh B121 - Page 145

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