Service manual

LQ-2070 Service Manual
Product Description
1.3.2 Interface Specifications
This printer provides a bidirectional 8-bit parallel interface and a Type B optional interface slot,
standard.
1.3.2.1 Parallel Interface (Fotward Channel)
● Transmission mode
8-bit parallel,
IEEE-P1284, compatibility mode
● Adaptable connector
57-30360
(Amphenol) or equivalent
● Synchronization
STROBE
P1.lk
. Handshaking
BUSY and
ACI@lLG signals
● Signal level
‘ITL compatible (IEEE-P1284 level 1. device)
Table 1-31 Pin Assignments for Forward Channel
Pin
Signal
Return
No.
Name
GND pin
In
IOut
Function Description
1
STROBE
19 In
Strobe pulse. Input data is latched at falling edge of the signal
2
DATA1
20 In Parallel input data to the printer
bit O: LSB
3
DATA2
21 In
bit 1
4 DATA3
22 In
bit 2
5
DATA4
23 In
bit 3
6
DATA5
24
In
bit 4
7
DATA6
25
In
bit 5
8
DATA7
26
In
bit 6
9 DATA8
27
In
bit 7: MSB
10
ACKNLG
28
out
This signal (negative pulse) indicates the printer has received
data and is ready to accept more data.
11 BUSY
29
out
This signal’s HIGH level means the printer is not ready to
accept data.
, 12 PE 28
out
This signal’s HIGH level means the printer has a paper-out
error.
13
SLCT
28
out Always HIGH when the printer is powered on.
14
AFXT 30 In
Not used.
31 M 30
In
This signal’s negative pulse initializes printer.
32 ERROR 29
out
This signal’s LOW level means the printer is in an error state.
36
SLIN 30
In
Not used.
18
Logic H ----
out This line is pulled up to + 5 V through 3.9KQ resistor.
35 +5V
----
Out
This line is pulled up to +5 V through
3.3KQ resistor.
17
Chassis ----
-–-
Chassis
GND.
16,33,
GND ---- ---
Signal GND.
19-30
15,34
NC ----
---
Not connected.
Rev.A
1-21