B064 SERIES SERVICE MODE
SM 4-17 B064 Series/B140 Series/G126
Trouble-
shooting
SC No. Symptom Possible Cause
Laser synchronization detector error 322 D
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.
• Harness between detector and I/F
disconnected or damaged
• Detector is installed incorrectly.
• Detector board is defective
• Controller board defective
• IPU board defective
• LDB defective
Polygonal mirror motor error 1 335 D
The ready signal does not go low
within 20 s after the polygonal
mirror motor turns on or changes
speed of rotation.
• Harness between I/F and polygon motor
disconnected or defective
• Polygon motor or polygon motor driver
defective
• IPU board defective
Polygonal mirror motor error 2 336 D
The ready signal does not go high
within 20 s after the polygonal
mirror motor turns off.
• Harness between I/F and polygon motor
disconnected or defective
• Polygon motor or polygon motor driver
defective
• IPU board defective
Polygonal mirror motor error 3 337 D
The XSCRDY signal goes high
while the polygonal mirror motor
turns on, even though there was no
demand for either turning off the
motor or changing the motor speed.
• Harness between the polygon motor and
I/F disconnected or defective.
• Polygon motor or polygon motor driver
defective
• IPU board defective
Polygonal mirror motor error 1 338 D
During exposure, while the polygon
motor is rotating, the XSCRDY
signal goes high.
• Harness between the polygon motor and
I/F disconnected or defective.
• Polygon motor or polygon motor driver
defective
• IPU board defective
TD sensor output error 340 D
TD sensor output voltage (Vt),
measured during each copy cycle,
is detected 10 times at one of the
following levels:
Vt = 0.5 volts or lower
Vt = 4.0 volts or higher
• TD sensor defective
• TD sensor harness disconnected
• TD sensor connector disconnected or
defective
• BCU defective
• Toner bottle motor defective
Note: When the TD sensor is defective, the
toner supply is controlled using pixel
count and the ID sensor.
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