Ricoh B039 Service Manual page 129

No.
Definition
130 B Communication Error between BiCU and SBU
The BiCU board cannot detect the SBU
connect signal.
192 B 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. (☛ SP4-908)
194 B SBU White Level Detection Error
The automatic SBU adjustment failed
twenty times consecutively.
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 B 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.
SM
Symptom
4-3
SERVICE CALL CONDITIONS
Possible Cause
• The flat cable between the BiCU
board and the SBU has a poor
connection
• The flat cable between the BiCU
board and the SBU damaged
• BiCU board defective
• SBU defective
• Exposure lamp defective
• SBU auto adjustment was not done
correctly (☛ 3.13 Copy adjustment
printing/scanning – Standard white
density adjustment)
• SBU defective
• BiCU board defective
• Exposure lamp stabilizer defective
• Exposure lamp defective
• Dirty white plate
• Incorrect position or width of white
plate scanning (☛ SP4-015)
• BiCU board defective
• SBU 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/IOB
and polygonal mirror motor driver
• BiCU board defective
• BiCU board defective
• IMB board defective
• The fax controller or printer controller
has a poor connection
• Fax controller or printer controller
defective
B039/B040/B043