Service manual

EPSON Stylus PHOTO 870/1270 Revision B
APPENDIX Connector Summary 149
Table 7-6. Connector Pin Assignment - CN9
Pin Signal Name I/O Function
1COCI
Color ink cartridge
detection
2 GND - Ground
3 COB I Black ink cartridge detection
4 GND - Ground
5 TH I Head temperature detection
6 NCHG O Head NCHG
7 GND - Ground
8 SCK O Clock
9 GND - Ground
10 SP O SP signal
11 SI6 O Head data
12 SI5 O Head data
13 SI4 O Head data
14 SI3 O Head data
15 SI1 O Head data
16 SI0 O Head data
17 GND - Ground
18 VDD3.3 - +3.3V
19 RXD O CSIC input
20 SEL I Command selectionš
21 TXD I CSIC output
Table 7-7. Connector Pin Assignment - CN10
Pin Signal Name I/O Function
1 +42V -
+42V from the power
supply board
2 +42V -
+42V from the power
supply board
3 GND - Ground
4 ESAVE O Energy save mode
5 PSC O Secondary power on/off
6 GND - Ground
7 GND - Ground
8 +5V - +5V supply
Table 7-8. Connector Pin Assignment - CN11
1 SW2 I Switch signal input
2 SW0 I Switch signal input
3 PSC I Power switch signal input
4 SW1 I Switch signal input
5 LED3 O LED output
6 +5V - +5V
7+5V-+5V
8 LED2 O LED output
9 GND - Ground
10 LED1 O LED output
11 SW3 I Switch signal input
12 LED0 O LED output