Epson Stylus COLOR 440 Service Manual page 157

EPSON Stylus COLOR 440, 640, and 740
Table A-2. Parallel Interface Connector (CN1)
Signal Return
Pin No. In/Out
Name GND Pin
1 STROBE 19
DATA0 to
2 to 9 20 to 27
DATA7
10 ACKNLG 28
11 BUSY 29
12 PE 28
13 SLCT 28
14 AFXT 30
31 INIT 30
32 ERROR 29
36 SLIN 30
18 Logic-H —
35 +5V —
Chassis
17 —
GND
16, 33,
GND —
19 to 30
15, 34 NC —
Notes: In and Out refer to the direction of signal flow from the printer's point of view.
A slash in front of a signal name means that the signal is active LOW.
Functional Description
The strobe pulse. Data is read in at the
In
falling edge of this pulse.
The DATA0 through DATA7 signals
represent data bits 0 through 7. Each
In signal is at a HIGH level when data is
logical 1, and at a LOW level when data
is logical 0.
This signal is a negative pulse indicating
Out
that the printer can again accept data.
A HIGH signal indicates that the printer
Out
cannot receive data.
A HIGH signal indicates a paper-out
Out
error.
Always HIGH when the printer is
Out
powered on.
In Not used.
The falling edge of a negative pulse or a
LOW signal on this line causes the
In
printer to initialize. Minimum 50
is necessary.
A LOW signal indicates a printer error
Out
condition.
In Not used.
Out Pulled up to +5 V via 3.9K ohm resistor.
Out Pulled up to +5 V via 3.3K ohm resistor.
— Chassis ground.
— Signal ground.
— Not connected.
Table A-3. Serial Interface Connector (CN2)
Pin No. Signal Name
1 SCLK
2 CTS
3 TXD-
4 SG
5 RXD-
6 TXD+
7 DTR
8 RXD+
Table A-4. Control Panel Connector (CN3)
Pin Signal Name
1 LED0
2 GND
3 LED1
µ
4 GND
s pulse
5 LED2
6 +5 V
7 +5 V
8 LED4
9 SW1
10 PSC
11 SW0
12 SW2
Table A-5. PE Sensor Connector (CN4)
Pin Signal Name
1 PE
2 GND
3 PEV
I/O Functional Description
Out Synchronous clock signal
In Clear To Send
Out Transmit Data (-)
In Signal Ground
In Receive Data (-)
Out Balanced Transmit Data (+)
Out Data Terminal Ready
In Balanced Receive Data (+)
I/O Function
Out LED drive signal (0)
— Ground
Out LED drive signal (1)
— Ground
Out LED drive signal (2)
— Logic power supply
— Logic power supply
Out LED drive signal (4)
In Panel switch input (1)
In Power on/off switch
In Panel switch on/off (0)
In Panel switch on/off (2)
I/O Function
In Sensor detect signal
— Ground
— Sensor power supply (+5 V)
Appendix
148