Epson Stylus Color 740 Service Manual

EPSON Stylus COLOR 440, 640, and 740 Chapter 2 Operating Principles
62
Figure 2-33. Head Driver Circuit for Stylus COLOR 640
Figure 2-34. Head Drive Circuit for Stylus COLOR 740
H8D2889(IC7)
XOVM
CTB
COM
DTB
GND
GND
25
1
20
+5
F1
+42
22
23
VHV
VHV
+5
GND
GND
GND
GND
GND
GND
VDD
15
14
12
10
8
6
4
COM
COM
COM
19
21
20
GND2
GND2
GND2
16
18
17
E05B43(IC2)
VHCTL
2
4
6
199
CCO
LAT
SI1
SI3
CLK
NCHG
BCO
THM
1
2
5
11
7
13
3
15
201
199
SW7
SW8
92
LP
HSO3
101
ICLK
HCLK
/NCHG
94
95
91
TMP95C061(IC1)
P84
15
CN8
CHG
KC1
ND1
ND2
MD1
MD2
Data
CLK
/STB
/CLR
VRF
VK
CHG
KC1
ND1
ND2
MD1
MD2
Data
CLK
/STB
/CLR
VRF
VK
VHCTL
Vcc
SI2
9
HSO2
99
HSO1
97
HSOIEN
96
CXA20996(IC14)
VCC45
Vcc45_2
NPNB
FB
PNPB
VOUTGND
F1
E05B588(IC2)
VHCTL
22
20
CCO
LAT
CLK
BCO
THM
1
2
5
14
11
3
190
SWC0
184
HLAT
IECLK
AN0
105
A0
A1
A2
A3
CLK1
CLK2
/FLOOR
/RST
DATA
DCLK
/E
HWA0
HWA1
HWA2
HWA3
HWCLK1
HWCLK2
/HWFLR
/HWRST
HWSDATA
HWSCLK
/HWSLAT
SI1
12
174
HNCHG
+42
23
18
16
22
21
20
19
26
25
24
23
GND2
GND2
GND2
GND2
COM
COM
COM
COM
VHV
27
VCC5
+5
24
14
SWC1
189
173
NCHG
16
HCLK
175
176
HSI1
SI2
HSI2
177
10
SI3
HSI3
178
8
SI4
9
179
HSI4
SI5
HSI5
180
7
SI6
HSI6
181
TMP95C061(IC1)
GND
GND
GND
GND
GND
+5
GND
18
17
15
13
6
4
CN9

Epson Stylus Color 740 Specifications

General

Brand	Epson
Model	Stylus Color 740
Category	Printer
Language	English