Epson Stylus Color 640 Service Manual page 69

EPSON Stylus Color 440/640/740
The following three figures show the sensor circuits. Out of the data
such as EPW with IEEE 1284 Nibble mode to be returned to the host,
the data to indicate ink consumption is calculated and managed by the
counter of the firmware. Therefore, it is omitted here.
+5V
AT93C46
(IC11)
8
Vcc
6
ORG
5
GND
Figure 2-23. Figure 5-23. Sensor Circuit for Stylus Color 440
Chapter 2 Operating Principles
E05B44
(IC2)
1 127
CS
ECS
2 128
SK
ECK
3 126
DI ECO
125
4
DO
ECI
+5V
IC 2
E05B43
+5V
+5V
206
SW4
+5V
+5V
+5V
204
SW5
+5V
+5V
+5V
202
SW6
Figure 2-24. Figure 5-24. Sensor Circuit for Stylus Color 640
+5V
IC 2
E05B588
+5V
+5V
97
SWA0
+5V
+5V
+5V
98
SWA1
+5V
+5V
+5V
99
SWA2
Figure 2-25. Sensor Circuit for Stylus Color 740
Revision A
ASFV
CN11
GND
ASF
ASF
HPV
GND
CN5
HP
HP
PEV
GND
CN4
PE
PE
ASFV
CN4
GND
ASF
ASF
HPV
GND
CN5
HP
HP
PEV
GND
CN6
PE
PE
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