Table of Contents
Advertisement
[b] Paper feed motor (DFM)/transport motor (DTM) drive circuit
TP60 TP62
TP59 TP61
TP58
67
M1H 1
65
M1L1
68
M1H2
66
M1L2
72
CHGCLK
TP55 TP57
TP54 TP56
27
M2H1
25
M2L1
28
M2H 2
26
M2L2
This circuit controls rotation/stop and the rotating direction of each motor, and is composed of G/A (IC 13) and the exclusive-use hybrid IC (IC6,
IC7). The circuit composition is the same in the paper feed motor drive circuit and the transport motor drive circuit. The descriptions are made for the
transport motor drive circuit.
The motor rotation, stop, rotating direction are controlled by combination of binary logic inputted to G/A through the data path from the CPU. By this,
the control signal is inputted to the G/A 25-28 pins. The G/A 25 pin and 26 pin are the PWM output for speed control. (Normal rotation, 26 pin;
reverse rotation, 25 pin)
These signals are inputted to the IC6. The IC6 is the hybrid IC including four power MOSFETs, and takes the G/A output 25 pin ∼ 28 pin, and drives
the motor.
The motor operates according to the combination of 25 pin ∼ 28 pin as shown in the table below:
25
Before start
0
CW
0
CCW
PWM
Brake
0
The paper feed motor operates as follows:
65
Before start
0
CW
0
CCW
PWM
Brake
0
In the brake mode, the both terminals of the motor are shorted, generating a strong brake torque to stop the motor.
+5V
14
12
15
13
C33
16
+5V
IC6
14
10
INA
OUT1-1
12
11
INB
OUT1-2
15
6
INC
OUT2-1
3
7
IND
OUT2-2
1
C52
CLK
+24V
13
2
VCC2
V2
+
9
VCC1-1
C34
16
8
SG
VCC1-2
PG1 PG2
C31
4
5
PGND
Paper feed motor/transport motor drive circuit
26
27
28
0
0
0
PWM
1
0
0
0
1
0
1
1
66
67
68
0
0
0
PWM
1
0
0
0
1
0
1
1
IC7
10
INA
OUT1-1
L2
11
INB
OUT1-2
6
INC
OUT2-1
L1
3
7
IND
OUT2-2
1
C53
CLK
+24V
2
VCC2
V2
+
9
VCC1-1
8
SG
VCC1-2
PG1 PG2
C32
4
5
PGND
L4
L3
(To current limit circuit)
– 30 –
4
DFM2
CN5-4
DFM
Paper feed motor
3
DFM1
CN5-3
2
DTM2
CN3-2
DTM
Transport motor
1
DTM1
CN3-1
Advertisement
Table of Contents
