Service manual

EPSON Stylus PHOTO 870/1270 Revision B
PRODUCT DESCRIPTIONS Interface 23
NOTE: In/Out refers to the direction of signal flow seen from the printer side.
Table 1-13. Connector Pin Assignment and Signals
Pin No.
Signal
Name
Return
GND Pin
In/Out Functional Description
1 -STROBE 19 In
The strobe pulse. Read-in of data is performed at the falling edge of this
pulse.
2-9 DATA0-7 20-27 In
The DATA0 through DATA7 signals represent data bits 0 to 7, respectively.
Each signal is at high level when data is logical 1 and low level when data is
logical 0.
10 -ACKNLG 28 Out
This signal is a negative pulse indicating that the printer can accept data
again.
11 BUSY 29 Out A high signal indicates that the printer cannot receive data.
12 PE 28 Out A high signal indicates paper-out error.
13 SLCT 28 Out Always at high level when the printer is powered on.
14 -AFXT 30 In Not used.
15 NC - - Not connected
16 GND - - Signal GND
17
Chassis
GND
- - Chassis GND
18 Logic H - Out Pulled up to +5V via 3.9 K ohm resistor.
19-30 GND - - Signal GND
31 -INIT 30 In
The falling edge of a negative pulse or a low signal on this line causes the
printer to initialize. Minimum 50us pulse is necessary.
32 -ERROR 29 Out A low signal indicates printer error condition.
33 GND - - Signal GND
34 NC - - Not connected
35 +5V - Out Pulled up to +5V via 3.3K ohm resistor.
36 -SLIN 30 In Not used.