Epson Stylus Color 640 Service Manual page 26

EPSON Stylus Color 440/640/740
Chapter 1 Product Description
Table 1-10. Parallel I/F Forward Channel
Signal Return
Pin No. In/Out
Name GND Pin
1 /STROBE 19
2-9 DATA0-7 20-27
10 /ACKNLG 28 O
11 BUSY 29 O
12 PE 28 O
13 SLCT 28 O
14 /AFXT 30
31 /INIT 30
32 /ERROR 29 O
36 /SLIN 30
18 Logic H ---- O
35 +5V ---- O
Chassis
17 ---- ---
GND
16,33,
GND ---- ---
19-30
15,34 NC ---- ---
Note) In and Out refer to the direction of signal flow from the printer's point of view.
Functional Description
The strobe pulse. Read-in of data is
I performed at the falling edge of this
pulse.
The DATA0 through DATA7 signals
represent data bits 0 to 7, respectively.
I Each signal is at high level when data is
logical 1 and low level when data is
logical 0.
This signal is a negative pulse indicating
that the printer can again accept data.
A high signal indicates that the printer
cannot receive data.
A high signal indicates paper-out error.
Always at high level when the printer is
powered on.
I Not used.
The falling edge of a negative pulse or a
low signal on this line causes the printer
I
to initialize. Minimum 50 us pulse is
necessary.
A low signal indicates printer error
condition.
I Not used.
Pulled up to +5V via 3.9K ohm resistor.
Pulled up to +5V via 3.9K ohm resistor.
Chassis GND.
Signal GND.
Not connected.
Revision A
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