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EPSON Stylus Color 900 Revision C
Operating Principles Electrical Circuit Operation Principles 73
Figure 2-18. Printhead Driver Circuit Block Diagram
CN8
C XA2128(IC15)
23
22
+42
CXA2128(IC16)
5
17
6
13
14
20
18
16
23
22
20
18
16
28
27
26
25
3
4
5
29
30
1
28
27
26
25
3
4
5
29
30
1
114
113
112
111
120
119
118
115
116
121
E05B59(IC2)
AN0
AN1
AN2
AN3
AN4
CPU(IC1)
CN9
COMe
1
20
21
17
15
6
7
19
9
11
13
4
ANODE5
AN5
105
106
107
108
109
110
19
1
2
9
10
110
109
107
102
97
98
99
100
101
108
Q3
Q4
Q5
Q6
F1
COC
COB
HLAT
HSOCLK
HSO_Y
HSO_M
HSO_C
HSO_B1
HSO_B2
HINV
HW A0
HW A1
HW A2
HW A3
HW CLK1
HW CLK2
/H W F L R
HW SDATA
HW SLC
/H W S L A T
A0
A1
A2
A3
CLK1
CLK2
/FLOOR
DATA
DCLK
/E
VCC45
VCC45_2
NPNB
FB
PNPB
Charging/discharging
circuit for color nozzles
Black nozzle rows
C o lo r n o z z le ro w s
H ead tem perature
detection circuit
AN data
(tem perature
detection
fo r e a c h c o lo r)
I/C detection signal
- Data latch signal
- Nozzle selection signal
- Clock signal
Trapezoid waveform
reverse signal
C o lo r n o z z le ro w
Charging/discharging
circuit for black nozzles
A0
A1
A2
A3
CLK1
CLK2
/FLOOR
DATA
DCLK
/E
VCC45
VCC45_2
NPNB
FB
PNPB
VHV
COMa
COMb
COMc
COMd
THM
ANODE1
ANODE2
ANODE3
ANODE4
COC
COB
LAT
CLK
Y
M
C
B1
B2
IN V