Ricoh B064 SERIES Service Manual page 455

SC No.
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 Polygonal mirror motor error 1
The ready signal does not go low
within 20 s after the polygonal
mirror motor turns on or changes
speed of rotation.
336 D Polygonal 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 polygonal mirror motor
turns on, even though there was no
demand for either turning off the
motor or changing the motor speed.
338 D Polygonal mirror motor error 1
During exposure, while the polygon
motor is rotating, the XSCRDY
signal goes high.
340 D TD sensor output error
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
SM
CÓPIA NÃO CONTROLADA
Symptom
4-17
CÓPIA NÃO CONTROLADA
B064 SERIES SERVICE MODE
Possible Cause
• 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
• 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
• Harness between the polygon motor and
I/F disconnected or defective.
• Polygon motor or polygon motor driver
defective
• IPU board defective
• Harness between the polygon motor and
I/F disconnected or defective.
• Polygon motor or polygon motor driver
defective
• IPU board defective
• 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.
B064 Series/B140 Series
/B246 Series/D052 Series