Epson Stylus Color 640 Service Manual page 165

EPSON Stylus Color 440/640/740
Table A-8. Connector CN8
Pin Signal Name I/O
1 BCO In
2 CCO In
3 THM In
4 GND ---
5 LAT Out
6 GND ---
7 SI3 Out
8 GND ---
9 SI2 Out
10 GND ---
11 SI1 Out
12 GND ---
13 CLK Out
14 GND ---
15 NCHG Out
16 GND ---
17 VDD ---
18 GND2 ---
19 GND2 ---
20 GND2 ---
21 COM ---
22 COM ---
23 COM ---
24 VHV ---
25 VHV ---
Chapter 7 Appendix
(C256MAIN)
Function
Black ink cartridge detect signal
Color ink cartridge detect signal
Thermistor detect signal
Ground
Head data latch pulse output
Ground
Head data output (3)
Ground
Head data output (2)
Ground
Head data output (1)
Ground
Clock pulse for head data transfer
Ground
Head all on pulse output
Ground
Logic power supply (+5V)
Ground
Ground
Ground
Head drive power supply
Head drive power supply
Head drive power supply
Head drive voltage control signal
Head drive voltage control signal
Table A-9. Connector CN10
Pin Signal Name I/O
1 +42V ---
2 +42V ---
3 GND ---
4 GND ---
5 PSC Out
6 GND ----
7 GND ---
8 +5V ---
Table A-10. Connector CN11
Pin Signal Name I/O
1 ASF In
2 GND ---
3 ASFV ---
Revision A
Function
Mechanism drive power supply
Mechanism drive power supply
Ground
Ground
Power supply switch output signal
Ground
Ground
Logic power supply
Function
Sensor detect signal
Ground
Sensor power supply (+5V)
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