Epson 440 - Manual (Page 69)

EPSON Stylus Color 440/640/740 Revision A
Chapter 2 Operating Principles 69
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.
Figure 2-23. Figure 5-23. Sensor Circuit for Stylus Color 440
Figure 2-24. Figure 5-24. Sensor Circuit for Stylus Color 640
Figure 2-25. Sensor Circuit for Stylus Color 740
+5V
8
6
5
AT93C46
(IC11)
Vcc
GND
ORG
E05B44
(IC2)
127
128
126
125
1
2
3
4
CS
SK
DI
DO
ECS
ECK
ECO
ECI
IC 2
E05B43
+5V
+5V
CN11
CN5
CN4
ASF
HP
PE
PE
GND
PEV
HP
GND
HPV
ASF
GND
ASFV
+5V
+5V
+5V
+5V
+5V
+5V
+5V
206
SW4
204
SW5
202
SW6
IC 2
E05B588
+5V
+5V
CN4
CN5
CN6
ASF
HP
PE
PE
GND
PEV
HP
GND
HPV
ASF
GND
ASFV
+5V
+5V
+5V
+5V
+5V
+5V
+5V
97
SWA0
98
SWA1
99
SWA2