Motor Driver Circuit - Epson Stylus CX4900 Service Manual

EPSON Stylus CX4900/CX4905/CX5000/DX5000/DX5050/CX5900/CX6000/DX6000/DX6050

2.4.2.3 Motor Driver Circuit

CR/PF Motor drive circuit
The motor driver IC (IC5) on the Main board drives CR/PF Motor. This product uses
DC motor and performs constant current PWM drive.
Based on the output pulse (signal) from CR Encoder or PF Encoder, the CPU (IC8) sets
the appropriate drive current value for each operational action 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 outputs the motor drive current to the CR/PF Motor.
When no data has been received for 5 minutes, the CPU sets the Motor Driver current
value to 0, turning off the Motor Driver, in order to conserve electricity.
Scanner Motor Driver Circuit
The motor driver IC (IC5) on the Main board drives Scanner Motor. This product uses
PM type stepping motor and performs constant current bi-polar drive.
The Motor Driver IC (IC9) forms the motor drive waveform based on the signal output
from the CPU (IC8), controlling the Scanner Motor.
When no data has been received for 5 minutes, the CPU sets the Motor Driver current
value to 0, turning off the Motor Driver, in order to conserve electricity.
OPERATING PRINCIPLES
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
OUT3A
1
C15
CLK1 OUT3B
3
B14
DATA1 OUT4A
C14 2
STB1 OUT4B
A15 12
CLK2
A14 10
DATA2 VOUT1
B15 11
STB2 SW1
5
VREF1 FB1
6
VREF2
8
VREF3
D16 48
ENB1 VOUT2
A16 13
ENB2 SW2
D14
36
OSC FB2
C16
35
SLEEP
31
+42V
VBBSW
SENSE1
26
VCP SENSE2
24
CP1 SENSE3
SENSE4
25
CP2 GND
37
GATEREG GND
GND
GND
Figure 2-19. Motor Driver Circuit Block Diagram
Revision A
44
1 CR-A
CN8 CR Motor
47
2 CR-B
42
1 PF-A
CN9
39 PF Motor
2 PF-B
19
4 B-
22
2 B
Scanner
CN10
17
Motor
3 A
14
1 B
29
30
+5V
28
+1.5V
33
32
+1.5V_BS
34
45
41
20
16
7
18
27
43
86