Epson Stylus COLOR 440 Service Manual page 71

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