Canon Color imageRUNNER C4580, Service Manual

Page: 226 / 851

Chapter 8
8-13
8.3.3.2 Laser Scanner Motor Speed Change Control
In the case of iRC4580/iRC4080, the Processing Speed varies among Mono, Color, and Transparency modes,
ie., 185, 163, and 105 mm/sec. Because those Ratios are not Integer, the Polygon Motor Speed of those machines
must be changed appropriately for their operation. These machines adopt Polygon Motor Speed Change for this
reason.
(In 1/2 speed, with the ratio being an integer, lines drawn by laser beams may be skipped, e.g., by drawing every
other line)
Polygon Motor Speed needs to be changed when Processing Speeds are switched to as shown in the Table
below.
T-8-7
*1
O: Speed Changed
X: Speed Not Changed
-: Combinations that do not exist
The following table shows the printing speed according to mode, and the process control against process speed.
T-8-8
*1 Adjust at paper interval
*2 Speed change control is needed when switching the process speed. If there is no switching, speed controls is
not performed.
Process speed after the speed change
Process speed before the speed change 210 105 185 163 81.5
210 iRC5180 Constant Speed by X - - -
105
Constant Speed by iRC5180 or
Transparency mode by iRC4580/
4080
X O O O
185 Bk Monochrome by iRC4580/
4080
- O O O
163 4C by iRC4580/
4080
- O O X
81.5 1/2 Speed by iRC4580/
4080
- O O X
Mode
iRC5180 iRC4580 iRC4080
msec/ppm
Remedy
msec/ppm
Remedy
msec/ppm
Remedy
Normal speed
mode
210
Normal
operation
163(40*1)
Speed
change
control*2
163(36*1)
Speed change
control*2
Bk high speed
mode
- - 185(45)
Speed
change
control*2
185(45)
Speed change
control*2
Half speed
mode
105 (25.5)
Thinning
out of laser
81.5 (20)
Thinning out
of laser
81.5 (20)
Thinning out of
laser
Transparency
mode 105
(11)*1
Thinning
out of laser
105 (11)*1
Speed
change
control*2
105 (11)*1
Speed change
control*2