Pcb; Controlling The Scanner Motor - Canon GP605 Service Manual

CHAPTER 3 ORIGINAL EXPOSURE SYSTEM
B.

Controlling the Scanner Motor

Figure 3-202 shows the construction of the scanner motor control mechanism.
The number of steps (clock
signals) is determined based on
combinations of D0 through D3.
J506A
0 V
1
Not used
2
OPT-D0
3
OPT-D1
4
OPT-D2
5
OPT-D3
6
OPT-CLK
7
OPT-CCW
8
OPT-CD0
9
OPT-CD1
10
OPT-CD2
11
OPT-DWN
12
13
Not used
When '1' power to
the motor is cut.
The current to the motor is
determined based on combinations
of CD0 through CD2.
Figure 3-202 Construction of the Control System
8000
4000
2000
1000
500
Figure 3-203 Relationship between Motor Speed and Reproduction Ratio
3-6
COPYRIGHT © 1999 CANON INC.
For motor drive
J802
1
2
3
4
5
6
7
8
9
10
11
12
13
Scanner motor driver PCB
Motor drive sync clock pulses; when '1',
the motor is at rest. The motor starts to
rotate in response to clock pulses.
Used to switch the direction of motor rotation:
when '1', the scanner moves forward; when
'0', the scanner moves in reverse.
4.4A
The scanner motor speed is varied
in increments of 1% (ratio).
50% 100%
25%/reverse
Relay PCB
J801
1 2 3 4 5 6 7
Excitation
control
Current level
200%
CANON GP605/605V REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
J803
Scanner motor
1
2
M5
3
4
5
J804
0 V
1
GLS_DT
2
PS57
5 V
3
Copyboard
glass sensor
In the absent of the
copyboard glass,'1'.
0.9A
400%