Epson FX-870 Service Manual

Reference Materials
See Table 1-14 for CNl (Centronics interface) signal functions and pin assignments.
Table 7-2. CN2, Optional I/F
Table 7-3. CN3, Front PE Sensor
(CO64 MAIN Hoard Assembly)
(CO94 MAIN Hoard Assembly)
No.
I I
l/O Signal Name
Function
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
+5
+5
+5
+5
+5
+5
TXD
READY
RXD
NC
RST
INH
CMREQ
WRRDY
RDREQ
WR
RD
cs
GND
GND
GND
GND
GND
GND
A3
A2
Al
A0
07
D6
D5
D4
D3
D2
Dl
DO
+5VDC
+5vDc
+5VDC
+5vDc
+5vDc
+5vDc
Transmit Data
Ready to Receive Data
Receive Data
No Connection
Reset
Inhibit
Command Request
Wriie Ready
Read Request
Write
Read
Chip Select
Signal Ground
Signal Ground
Signal Ground
Signal Ground
Signal Ground
Signal Ground
Address Bus Blt 3
Address Bus Bit 2
Address Bus Bit 1
Address Bus Bit 0
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 Blt 0
No.
l/O Signal Name
Function
1 -
GND
Signal Ground
1 2 1 I 1 PEF
1 Front Paper End 1
Table 7-4. CN4, Release Sensor
(CO94 MAIN Hoard Assembly)
Table 7-5. CN5, PG Sensor
(CO94 MAIN Hoard Assembly)
-
MO.
1
2
3
4
5
6
-
Table 7-6. CN6, Paper Feed Motor
(CO64 MAIN Hoard Assembly)
Signal Name
Function
PFA
PF Motor Phase A
PFA
PF Motor Phase 3
PFB
PF Motor Phase B
PFB
PF Motor Phased
PFCOM PF Motor Common
PFCOM
PF Motor Common
Table 7-7. CN7, Home Position Sensor
(CO64 MAIN Hoard Assembly)
Epson FX-870/1170
7-3

Epson FX-870 Specifications

General

Brand	Epson
Model	FX-870
Category	Printer
Language	English