Operation; Laser Exposure Process; Laser Emission Timing; Advance Polygon Rotation - Konica Minolta bizhub 200 Service Manual

Theory of Operation Ver. 2.5 Jul. 2006
8.2

Operation

8.2.1

Laser exposure process

1. The laser light emitted from the semiconductor laser is reflected off the Polygon
Mirror.
2. The Polygon Mirror has seven faces, being turned at high speeds by the Polygon
Motor.
3. The light reflected off the Polygon Mirror illuminates the surface of the Photo Con-
ductor via the G1 Lens.
G1 Lens
Polygon Motor (M9)
8.2.2

Laser emission timing

• The laser light emitted from the Semiconductor Laser strikes the Polygon Mirror.
• When a Ready signal is detected after the lapse of a predetermined period of time after a
print cycle has been started, the MFBS Board produces an output of a Laser ON signal.
• The Laser ON signal triggers the firing of each laser light which illuminates the SOS
Board via the Polygon Mirror, G1 Lens, and SOS Mirror. This generates an SOS signal.
• The SOS Sensor ensures that the laser light emission start timing remains constant for
each line of main scan.
8.2.3

Advance Polygon Rotation

• To shorten the first print time, the Polygon Motor is energized before a print command is
issued.
• This timing starts when a original is loaded or a key on the control panel is pressed.
• If no print command is received during the advance energization, the motor is then deen-
ergized.
Laser Diode
8. Write section (PH section)
SOS Sensor
4040T2C567AA
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