Epson FX 1170 Service Manual - Page 132

Chip Select, Signal Ground, Ground, Address Bus Bit 3, Data Bus Bit 7

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REV.-A See Table 1-14 for CNI (Centronics interface). Table A-2. CN2 (BOARD ASSEMBLY, C094 MAIN) No. 1/0 Signal Name Function 1 - +5 2 - +5 3 - +5 4 - +5 5 - +5 6 - +5 7 0 TXD 8 0 READY 9 I RXD 10 - NC 11 0 RST 12 0 INH 13 I CMREQ 14 I WRRDY 15 I RDREQ 16 0 W R 17 0 m 18 0 Cs 19 20 - GND GND 21 - GND 22 - GND 23 - GND 24 - GND 25 0 A3 26 0 A2 27 0 A l 28 0 AO 29 1/0 D7 30 1/0 D6 31 1/0 D5 32 1/0 D4 33 1/0 D3 34 1/0 D2 35 1/0 D1 36 1/0 DO +5 VDC +5 VDC +5 VDC +5 VDC +5 VDC +5 VDC Transmit Data Ready to Receive Data Receive Data No Connection Reset Inhibit Command Request Write Ready Read Request Write Read Chip Select Signal Ground Signal Ground Signal Ground Signal Ground Signal Ground Signal Ground Address Bus Bit 3 Address Bus Bit 2 Address Bus Bit 1 Address Bus Bit O Data Bus Bit 7 Data Bus Bit 6 Data Bus Bit 5 Data Bus Bit 4 Data Bus Bit 3 Data Bus Bit 2 Data Bus Bit 1 Data Bus Bit O Table A-3. CN3 (BOARD ASSEMBLY, C094 MAIN) No. 1/0 Signal Name Function 12I GND PEF Signal Ground Paper End, FRONT Table A-4. CN4 (BOARD ASSEMBLY, C094 MAIN) No. 1/0 Signal Name Function 12I GND Lsw Signal Ground Release Lever Position Table A-4. CN5 (BOARD ASSEMBLY, C094 MAIN) No. 1/0 Signal Name Function 12I GND GSW Signal Ground Platen Gap Adjust Lever Table A-6. CN6 (BOARD ASSEMBLY, C094 MAIN) No. 1/0 Signal Name Function 1 0 PF A 2 0 PF ~ 3 0 PF B 4 0 PF ~ 5 0 PFCOM 6 0 PFCOM PF Motor Phase A PF Motor Phase ~ PF Motor Phase B PF Motor Phase ~ PF Motor Common PF Motor Common Table A-7. CN7 (BOARD ASSEMBLY, C094 MAIN) No. 1/0 Signal Name Function 12I GND HOME Signal Ground CR Home Position A-3

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REV.-A
See Table 1-14 for
CNI
(Centronics
interface).
Table A-2.
CN2
(BOARD ASSEMBLY,
C094
MAIN)
No.
1/0
Signal Name
Function
1
-
+5
+5
VDC
2
-
+5
+5
VDC
3
-
+5
+5
VDC
4
-
+5
+5
VDC
5
-
+5
+5
VDC
6
-
+5
+5
VDC
7
0
TXD
Transmit Data
8
0
READY
Ready to Receive Data
9
I
RXD
Receive Data
10
-
NC
No Connection
11
0
RST
Reset
12
0
INH
Inhibit
13
I
CMREQ
Command Request
14
I
WRRDY
Write Ready
15
I
RDREQ
Read Request
16
0
WR
Write
17
0
m
Read
18
0
Cs
Chip Select
19
-
GND
Signal Ground
20
-
GND
Signal Ground
21
-
GND
Signal Ground
22
-
GND
Signal
Ground
23
-
GND
Signal Ground
24
-
GND
Signal Ground
25
0
A3
Address Bus Bit 3
26
0
A2
Address Bus Bit 2
27
0
Al
Address Bus Bit 1
28
0
AO
Address Bus Bit O
29
1/0
D7
Data Bus Bit 7
30
1/0
D6
Data Bus Bit 6
31
1/0
D5
Data Bus Bit 5
32
1/0
D4
Data Bus Bit 4
33
1/0
D3
Data Bus Bit 3
34
1/0
D2
Data
Bus Bit 2
35
1/0
D1
Data Bus Bit 1
36
1/0
DO
Data Bus Bit O
Table A-3.
CN3
(BOARD ASSEMBLY,
C094
MAIN)
No.
1/0
Signal Name
Function
1
-
GND
Signal Ground
2
I
PEF
Paper End, FRONT
Table A-4.
CN4
(BOARD ASSEMBLY,
C094
MAIN)
No.
1/0
Signal Name
Function
1
-
GND
Signal Ground
2
I
Lsw
Release Lever Position
Table A-4.
CN5
(BOARD ASSEMBLY,
C094
MAIN)
No.
1/0
Signal Name
Function
1
-
GND
Signal Ground
2
I
GSW
Platen Gap Adjust Lever
Table A-6.
CN6
(BOARD ASSEMBLY,
C094
MAIN)
No.
1/0
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
PFCOM
PF Motor Common
6
0
PFCOM
PF Motor Common
Table A-7.
CN7
(BOARD ASSEMBLY,
C094
MAIN)
No.
1/0
Signal Name
Function
1
-
GND
Signal Ground
2
I
HOME
CR Home Position
A-3