Epson Stylus Color 640 Service Manual page 164

EPSON Stylus Color 440/640/740
Table A-5. Connector CN6
Pin Signal Name I/O
1 CRA Out
2 CRB Out
3 CR-A Out
4 CR-B Out
Table A-6. Connector CN7
Pin Signal Name I/O
1 PFA Out
2 PFB Out
3 PF-A Out
4 PF-B Out
Chapter 7 Appendix
Function
Phase drive signal (A)
Phase drive signal (B)
Phase drive signal (-A)
Phase drive signal (-B)
Function
Phase drive signal (A)
Phase drive signal (B)
Phase drive signal (-A)
Phase drive signal (-B)
Table A-7. Connector CN8
Pin Signal Name I/O
1 BCO In
2 CCO In
3 THM In
4 GND ---
5 LAT Out
6 GND ---
7 SI2 Out
8 GND ---
9 SI1 Out
10 GND ---
11 CLK Out
12 GND ---
13 NCHG Out
14 GND ---
15 VDD ---
16 GND2 ---
17 GND2 ---
18 GND2 ---
19 COM ---
20 COM ---
21 COM ---
22 VHV ---
23 VHV ---
Revision A
(C206MAIN-B, C255MAIN)
Function
Black ink cartridge detect signal
Color ink cartridge detect signal
Thermistor detect signal
Ground
Head data latch pulse output
Ground
Head data output (2)
Ground
Head data output (1)
Ground
Head data output (1)
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
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