Motor Driver Circuit - Epson Stylus C110 Service Manual

EPSON Stylus C110/C120/D120

2.3.2.3 Motor Driver Circuit

CR/PF M
OTOR DRIVE CIRCUIT
The motor driver IC (IC5) on the main board drives CR/PF motors. The both motors
are DC motor and are controlled by constant current PWM drive method.
Based on the output pulse (signal) from the CR encoder or PF encoder, the CPU (IC8)
sets the appropriate drive voltage for the current operation and outputs the value as a
special control signal to the motor driver (IC5). Then, based on the signal output from
the CPU, the motor driver applies the corresponding motor drive voltage to the CR/PF
motor.
When no data has been received for 5 minutes, the CPU sets the motor driver voltage to
0, and turn the motor driver Off to save power.
OPERATING PRINCIPLE
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Electrical Circuit Operating Principles
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+3.3V +42V +3.3V
CPU
(IC8)
46
40
21
15
C15
SCLK1_DCMCU
B14
SDATA1_DCMCU
C14
SLD1_DCMCU
12
A15
SCLK2_DCMCU
10
A14
SDATA2_DCMCU
11
B15
SLD2_DCMCU
48
D16
ENB1_DCMCU
13
A16
ENB2_DCMCU
36
D14
CLK4M
35
C16
RST_DCMCU
31
+42V
26
24
25
37
Figure 2-21. Motor Driver Circuit Block Diagram
Revision B
Motor driver
(IC5)
9
44
1 CR-A
VDD OUT1A
CN8
47
2 CR-B
OUT1B
VBB1
VBB2
42
1 PF-A
VBB3 OUT2A
39
CN9
2 PF-B
VBB4 OUT2B
1
CLK1
3
DATA1
2
STB1
CLK2
29
DATA2 VOUT1
30
STB2 SW1
5 28
VREF1 FB1
6
VREF2
8
VREF3
+1.5V
33
ENB1 VOUT2
32
ENB2 SW2
34
FB2
OSC
SLEEP
VBBSW
45
SENSE1
41
VCP SENSE2
20
CP1 SENSE3
16
SENSE4
7
CP2 GND
18
GATEREG GND
27
GND
43
GND
CR Motor
PF Motor
+5V
+1.5V_BS
39