Ricoh MT-C1 Service Manual page 434

B140/B246 SERIES SERVICE MODE
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 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.
• 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
B140 Only
• BICU board defective
• PCI bus between controller board,
BICU board defective
B140 Only
• Harness between detector and I/F
disconnected or damaged
• Detector is installed incorrectly
• Detector board is defective
• IPU board defective
B140 Only
• Harness between I/F and polygon
motor disconnected or defective
• Polygon motor or polygon motor driver
defective
• IPU board defective
B140 Only
• Harness between I/F and polygon
motor disconnected or defective
• Polygon motor or polygon motor driver
defective
• IPU board defective
B140 Only
• 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
B140 Only
• Noise on the linef 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
4-46
15 February 2006