Product Description - Epson Stylus Color C70 Service Manual

EPSON Stylus COLOR C70/C80
Table 1-6. Typical Time of tack
Parallel I/F Mode
High Speed
Normal Speed
Table 1-7. Signal Level: TTL Compatible (IEEE-1284 level 1 device)
Parameter Minimum
VOH* -
VOL* -0.5V
IOH* -
IOL* -
CO -
VIH -
VIL 0.8V
IIH -
IIL -
CI -
NOTE: (*) A low logic level on the Logic H signal is 2.0V or less when the
printers powered off and this signal is equal or exceeding 3.0V when
the printer is powered on. The receiver shall provide an impedance
equivalent to 7.5K ohm to ground.
Table 1-8. Connector Pin Assignment and Signals
Return
Pin No. Signal Name
GND Pin
1 -STROBE 19
2 DATA 0 20
3 DATA 1 21

PRODUCT DESCRIPTION

Typical Time of tack
0.5us
2us
Maximum Condition
5.5V
-
0.32mA VOH = 2.4V
12mA VOL = 0.4V
50pF
2.0V
-
0.32mA VIH = 2.0V
12mA VIL = 0.8V
50pF
z
In/Out Functional Description
The strobe pulse. Read-in of data is performed at
In
the falling edge of this pulse.
In The DATA 0 through DATA 7 signals represent
data bits 0 to 7, respectively.
Each signal is at high level when data is logical
In
1 and low level when data is logical 0.
Table 1-8. Connector Pin Assignment and Signals (continued)
Pin No. Signal Name
4 DATA 2
5 DATA 3
6 DATA 4
7 DATA 5
8 DATA 6
9 DATA 7
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
NOTE: In/Out refers to the direction of signal flow from the printer's point of
view.
INTERFACE
Return
In/Out Functional Description
GND Pin
22 In
23 In
The DATA 0 through DATA 7 signals represent
data bits 0 to 7, respectively.
24 In
Each signal is at high level when data is logical
25 In
1 and low level when data is logical 0.
26 In
27 In
This signal is a negative pulse indicating that the
28 Out
printer can accept data again.
A high signal indicates that the printer cannot
29 Out
receive data.
28 Out A high signal indicates paper-out error.
Always at high level when the printer is
28 Out
powered on.
30 In Not used.
The falling edge of a negative pulse or a low
30 In signal on this line causes the printer to initialize.
Minimum 50 us pulse is necessary.
29 Out A low signal indicates printer error condition.
30 In Not used.
- Out Pulled up to +5V via 3.9 K ohm resistor.
- Out Pulled up to +5V via 3.3K ohm resistor.
- - Chassis GND
- - Signal GND
- - Not connected
Revision A
16