Write Control; Polygon Control; Image Stabilization Control - Konica Minolta BIZHUB 750 Service Manual

Theory of Operation Ver1.0 Aug.2005
7.2.2

Write control

To prevent the mis-centering of written images, the INDEX signal detected by the index board (INDEXB) is used
to decide a reference position for writing in the direction of the drum shaft (main scan direction) and control the
starting position of the laser irradiation on the drum according to the paper edge detected by the centering sen-
sor (PS66).
7.2.3

Polygon control

The polygon mirror is driven by the polygon motor (M15) and the number of its rotations changes according to
the process speed that varies with the type of paper.
A. In the case of bizhub 750
Type of paper
Regular
Thick paper
NOTE
• The number of rotations of the polygon mirror for the thick paper is the same as that for the regu-
lar paper. However, to comply with the reduction in the process speed (to as much as 50%), every
other plane of the six reflection planes of the polygon mirror is used to scan the laser beam.
B. In the case of bizhub 600
Type of paper
Regular
Thick paper
NOTE
• The number of rotations of the polygon mirror for the thick paper is faster than that for the regular
paper. However, to comply with the reduction in the process speed, every other plane of the six
reflection planes of the polygon mirror is used to scan the laser beam.
7.2.4

Image stabilization control

There are following items for the image stabilization control. For particulars, see "24. IMAGE STABILIZATION
CONTROL."
• MPC (Maximum power control)
• APC (Auto power control)
• Dot diameter adjustment control
Process speed
357 mm/s
178.5 mm/s
Process speed
300 mm/s
178.5 mm/s
7. WRITE SECTION
No. of rotations
42165.35 rpm
42165.35 rpm (Note)
No. of rotations
35433.07 rpm
42165.35 rpm (Note)
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