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[d] Transport motor (DTM) drive circuit
This circuit controls the transport motor rotation/stop, the rotating direction, and the motor current. It is composed of the CPU (IC11), the constant
current chopper system driver IC (IC8), and the G/A (IC7).
The motor rotating speed and the rotating direction are controlled with the stepping motor drive excitement pattern signals from the CPU (12 ∼ 15
pins).
The PWM (20KHz) signal from the G/A (17 pin) is divided and integrated by R113, bR116, and C39 to be converted into a constant voltage, which is
inputted to IC8 (9 pin, 11 pin) to set the motor current value.
By varying the PWM signal duty, a desired motor current value can be obtained.
[e] Reverse motor (DRM) drive circuit
This circuit controls the reverse motor rotation/stop, the rotating direction, and the motor current, and is composed of the CPU (IC11), the
constant-current chopper system driver IC (IC12), and the G/A (IC7).
The motor rotating speed and the rotating direction are controlled with the stepping motor drive excitement pattern signals from the CPU (16 ∼ 19
pins).
The PWM (20KHz) signal from the G/A (16 pin) is divided and integrated by R112, bR114, and C37 to be converted into a constant voltage, which is
inputted to IC12 (9 pin, 11 pin) to set the motor current value.
By varying the PWM signal duty, a desired motor current value can be obtained.
CPU
(IC11)
16
P04
17
P05
18
O06
19
P07
12
P00
13
P01
14
P02
15
P03
G/A
(IC7)
16
PWM3
17
PWM4
IC12
TP45
13
A1
15
A2
14
B1
16
B2
TP42
TP43
9
VREF
R112
11
VREF
68K
8
TD1
C37
10
TD2
0.1µ F
R11
5
9.1K
SG
4
C33
PG
100PF
STK6712BMK4
PGND
IC8
TP44
13
A1
15
A2
14
B1
16
B2
TP33
TP22
9
VREF
R113
11
VREF
68K
8
TD1
C39
10
TD2
0.1µ F
R116
5
20K
SG
4
C32
PG
100PF
STK6713BMK4
PGND
Transport motor/reverse motor drive circuit
+5V
C11
10µ F
2
A10
A
CN7-8
3
A20
*A
CN7-7
6
B
CN7-6
B10
7
B20
*B
CN7-5
+24V
+24V CN7-4
+24V CN7-3
C51
100µ F
12
NC
PGND
+5V
C10
10µ F
2
A10
A
CN4-4
3
A20
*A
CN4-3
6
B10
B
CN4-2
7
B20
*B
CN4-1
+24V
+24V CN4-5
+24V CN4-6
C53
100µ F
12
NC
PGND
10 – 9
Reverse
motor
DTM
Paper feed
motor
DRM
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