Epson FX 1170 - B/W Dot-matrix Printer, Service Manual

Page: 132 / 138

See Table 1-14 for interface).
Table A-2. (BOARD ASSEMBLY, MAIN)
No. Signal Name Function
1 - +5
+5
2 - +5 +5
3 - +5 +5
4 - +5 +5
5 - +5 +5
6 - +5 +5
7 0
TXD Transmit Data
8 0 READY Ready to Receive Data
9 I RXD Receive Data
10 - NC
No Connection
0 RST Reset
12 0 Inhibit
13 I CMREQ Command Request
14 I
W R R D Y W r i t e R e a d y
15 I R D R E Q Read Request
1 6 0 W R
W r i t e
17
0
Read
18 0 Cs Chip Select
19 -
Signal Ground
20 -
Signal Ground
21 -
Signal Ground
22 - Signal Ground
23 -
Signal Ground
24 -
Signal Ground
25 0 A3
Address Bus Bit 3
26 0 A2
Address Bus Bit 2
27 0 A l
Address Bus Bit 1
28 0 AO
Address Bus Bit O
29 D7
Data Bus Bit 7
30 D6
Data Bus Bit 6
31 D5 Data Bus Bit 5
32 D4
Data Bus Bit 4
33 D3 Data Bus Bit 3
34
D2
Data
Bus Bit 2
35
D1
Data Bus Bit 1
36 DO Data Bus Bit O
Table A-3. (BOARD ASSEMBLY, MAIN)
No. Signal Name Function
Signal Ground
2 PEF Paper End, FRONT
Table A-4. (BOARD ASSEMBLY, MAIN)
No. Signal Name
Function
1 - Signal Ground
2 I Release Lever Position
Table A-4. (BOARD ASSEMBLY, MAIN)
No. Signal Name Function
Signal Ground
2 GSW Platen Gap Adjust Lever
Table A-6. (BOARD ASSEMBLY, MAIN)
No. Signal Name Function
1 0 PF A
PF Motor Phase A
2 0
PF PF Motor Phase
3 0 PF B
PF Motor Phase B
4 0
PF PF Motor Phase
5 0
PF Motor Common
6 0
PF Motor Common
Table A-7. (BOARD ASSEMBLY, MAIN)
No. Signal Name Function
Signal Ground
2
HOME CR Home Position
A-3