Ricoh B064 Service Manual page 367

SC No.
317 C Potential sensor calibration error 7
During drum potential sensor
calibration, when VL is adjusted, the
pattern surface potential VL pattern
is not within range 0V ~ –400V. (VL
is the potential after exposing a
white pattern.)
321 D No laser writing signal (F-GATE error)
The laser writing signal (F-GATE)
for the IPU does not go LOW within
60 s.
322 D Laser synchronization detector error
After the polygon motor reaches
standard rotation speed and the LD
unit fires for 500 ms, the laser
synchronization detector does not
generate a signal.
335 D Polygon mirror motor error 1
The ready signal does not go low
within 20 s after the polygon mirror
motor turns on or changes speed.
336 D Polygon mirror motor error 2
The ready signal does not go high
within 20 s after the polygonal
mirror motor turns off.
337 D Polygonal mirror motor error 3
The XSCRDY signal goes high
while the polygon mirror motor turns
on, even though there was no
request to either turn off the motor
or change the motor speed.
338 D Polygonal mirror motor error 4
While the polygon motor is rotating,
the XSCRDY signal goes high
during exposure.
SM
B140 SERIES AND G126 SERVICE MODE
Symptom
4-43
Possible Cause
• Potential sensor defective
• Potential sensor harness disconnected
• Potential sensor connector defective or
disconnected
• IOB defective
• OPC connector defective
• Charge corona power pack defective
• Development power pack defective
• BICU board defective
• PCI bus between controller board, BICU
board defective
• Harness between detector and I/F
disconnected or damaged
• Detector is installed incorrectly
• Detector board is defective
• IPU board defective
• Harness between I/F and polygon motor
disconnected or defective
• Polygon motor or polygon motor driver
defective
• IPU board defective
• Harness between I/F and polygon motor
disconnected or defective
• Polygon motor or polygon motor driver
defective
• IPU board defective
• Noise on the line where the polygon
ready signal (XSCRDY) is transmitted.
• Harness between the polygon motor and
I/F disconnected or defective.
• Polygon motor or polygon motor driver
defective
• Noise on the line where the polygon
ready signal (XSCRDY) is transmitted.
• Harness between the polygon motor and
I/F disconnected or defective.
• Polygon motor or polygon motor driver
defective
• IPU board defective
B064 Series/B140 Series/G126