M2 (Optical Motor) Control - Konica Minolta 7020 Service Manual

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M2 (Optical Motor) Control

24VDC
24VDC
24VDC
PGND
PGND
PGND
5VDC
5VDC
SGND
SGND
DCPS
M2 (optical motor) is controlled by the SCDB (scanner
drive board). A related signal is provided by PS14 (optics
home position PS).
1. Operation
a. Operation of M2
M2 is a 3 phase stepping motor running on 24VDC.
This motor drives the exposure unit so as to
implement scanning. Forward rotation, reverse
rotation, and rotation speed are switched as
necessary to carry out each scan cycle.
The exposure unit's home position is detected by
PS14. M2 operation (drive time span and drive
direction) is controlled by time count after PS14 ON
or PS14 OFF.
b. Exposure unit's scan speed
Scan Speed
4
Forward
Reverse
c. Initial operation when power is turned ON
When SW2 (sub power switch) comes ON, the
exposure unit starts a home position search. The
search procedure differs according to whether PS14
is ON or OFF. Upon completing the search, the
exposure unit stands by at the platen mode's APS
reading position.
U
V M2
W
SGND
OPT_HOME
PS14
5VDC
SCDB
Scan Speed
<Other than 7035/7135>
140mm/sec
(1:1 magnification)
<7035/7135>
180mm/sec
(1:1 magnification)
<Other than 7035/7135>
241mm/sec (max)
<7035/7135>
310mm/sec (max)
(1) When PS14 is turned ON
7020/25/30
Shading correction
reading
Reference point
Other than 7020/25/30
Shading correction
reading
Reference point
(2) When PS14 is goes OFF
7020/25/30
Shading correction
reading
Reference point
Other than 7020/25/30
Shading correction
reading
Reference point
d. Shading correction reading
Shading correction read out is implemented using the
white reference plate attached beneath the glass
stopper plate. Shading correction is executed when
SW2 comes ON.
4 In the case of the 7035/7135, shading correction is
performed when SW2 is turned ON, and also during
each scanning job.
e. Exposure scanning modes
Two modes are implemented: platen mode and DF mode.
In platen mode, the exposure unit moves as necessary
to scan the original. In DF mode, the RADF side
moves the original while the exposure unit stays fixed
in a specified position (the DF reading position).
2-C-2
Platen APS
reading position
PS14
Platen APS
reading position
PS14
Platen APS
reading position
PS14
Platen APS
reading position
PS14