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
CPU
(IC8)
SCLK1_DCMCU
SDATA1_DCMCU
SLD1_DCMCU
SCLK2_DCMCU
SDATA2_DCMCU
SLD2_DCMCU
ENB1_DCMCU
ENB2_DCMCU
CLK4M
RST_DCMCU
Electrical Circuit Operating Principles
+3.3V +42V +3.3V
Motor driver
(IC5)
9
VDD OUT1A
46
VBB1 OUT1B
40
VBB2
21
VBB3 OUT2A
15
VBB4 OUT2B
1
C15
CLK1
3
B14
DATA1
2
C14
STB1
12
A15
CLK2
10
A14
DATA2 VOUT1
11
B15
STB2 SW1
5
VREF1 FB1
6
VREF2
8
VREF3
48
D16
ENB1 VOUT2
13
A16
ENB2 SW2
36
D14
OSC FB2
35
C16
SLEEP
31
+42V
VBBSW
SENSE1
26
VCP SENSE2
24
CP1 SENSE3
SENSE4
25
CP2 GND
37
GATEREG GND
GND
GND
Figure 2-21. Motor Driver Circuit Block Diagram
Revision B
44
1 CR-A
CN8
47 CR Motor
2 CR-B
42
1 PF-A
39
PF Motor
CN9
2 PF-B
29
30
+5V
28
+1.5V
33
32
+1.5V_BS
34
45
41
20
16
7
18
27
43
39