Epson Stylus Photo 870 Service Manual page 115

EPSON Stylus Photo 870/1270
Table 6-18. Connector CN8 (continued)
Pin Signal In/Out
9 CH Out
10 GND —
11 VDD —
12 GND —
13 VHV —
14 GND2 —
15 GND2 —
16 GND2 —
17 GND2 —
18 COM —
19 COM —
20 COM —
21 COM —
Table 6-19. Connector CN9
Pin Signal In/Out
1 COC In
2 GND —
3 COB In
4 GND —
5 TH In
6 NCHG Out
7 GND —
8 SCK Out
Function
Waveform selection signal for MS shot and
variable shot
Ground
Logic power supply (+5 V)
Ground
+42 V power supply for nozzle selector
Ground
Ground
Ground
Ground
Head drive pulse (trapezoidal waveform)
Head drive pulse (trapezoidal waveform)
Head drive pulse (trapezoidal waveform)
Head drive pulse (trapezoidal waveform)
Function
Color ink cartridge detection
Ground
Black ink cartridge detection
Ground
Head temperature detection
Head NCHG
Ground
Clock
Table 6-19. Connector CN9 (continued)
Pin Signal In/Out
9 GND —
10 SP Out
11 SI6 Out
12 SI5 Out
13 SI4 Out
14 SI3 Out
15 SI1 Out
16 SI0 Out
17 GND —
18 VDD3.3 —
19 RXD Out
20 SEL In
21 TXD In
Table 6-20. Connector CN10
Pin Signal In/Out
1 +42V —
2 +42V —
3 GND —
4 ESAVE Out
5 PSC Out
6 GND —
7 GND —
8 +5V —
Chapter 7 Appendix
Function
Ground
SP signal
Head data
Head data
Head data
Head data
Head data
Head data
Ground
+3.3V
CSIC input
Command selectionš
CSIC output
Function
Mechanism drive power supply
Mechanism drive power supply
Ground
Energy Save Mode
Power supply control signal
Ground
Ground
Logic power supply
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