Epson Stylus COLOR 900 Service Manual page 24

EPSON Stylus COLOR 900/900N
Pin No. Signal Name
1 /STROBE
2 DATA0
3 DATA1
4 DATA2
5 DATA3
6 DATA4
7 DATA5
8 DATA6
9 DATA7
10 /ACKNLG
11 BUSY
12 PE
13 SLCT
14 /AFXT
31 /INIT
32 /ERROR
36 /SLIN
18 Logic H
35 +5V
17 Chassis GND
16,33,
GND
19-30
15,34 NC
*: In and Out refers to the direction of the signal as viewed from the printer.
Table 1-13. Parallel I/F Forward Channel
Return
In/Out
GND Pin
19 I The strobe pulse. Read-in of data is performed at the falling edge of this pulse.
20 I
21
22
The DATA0 through DATA7 signals represent data bits 0 to 7, respectively. Each
signal is HIGH when data is logical 1 and LOW when data is logical 0.
23
24
25
26
27
28 O This signal is a negative pulse indicating that the printer can again accept data.
29 O A HIGH signal indicates that the printer cannot receive data.
28 O A HIGH signal indicates paper-out error.
28 O Always HIGH when the printer is on.
30 I Not used.
The falling edge of a negative pulse or a LOW signal on this line causes the printer
30 I
to initialize. A minimum 50 us pulse is necessary.
29 O A LOW signal indicates a printer error.
30 I Not used.
—- O Pulled up to +5 V via 3.9K ohm resistor.
— O Pulled up to +5 V via 3.9K ohm resistor.
— — Chassis GND.
— — Signal GND.
— — Not connected.
Chapter 1 Product Description
Functional Description
19