B245/B276/B277/B268/B269 Service Manual 18-Jan-06
119
No.
Definition
Symptom Possible Cause
the charge roller is
detected.
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
391 B Development bias leak
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