Aficio MP1900, Service Manual

Page: 156 / 188

No.
Definition
Symptom Possible Cause
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.
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
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.
BICU board defective
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.
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
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.
TD sensor abnormal
Poor connection of the PCU
391 B
Development bias leak
A development bias leak signal is
detected.
Poor connection of the PCU
High voltage supply board defective
3. Appendix: Troubleshooting Guide
22
3
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA