Epson LX-300 Service Manual

LX-300 Sanka Manual
Opamting Principk
2.3.9 Interface Circuit
Figure 2-20 shows the parallel interface circuit block diagram. Data from the host mmputer is
latched within the system
IC by a WOOSTROBE signal. The system IC outputs a BUSY signal
automatically to stop the host computer from sending further data. The CPU block reads the data
latched in the gate array block periodically without generating an interrupt.
STSTEM IC
PARALLEL l/F
ICI
“w.
y////y///////// ‘ND7-0
--h
5’ STROBE
. . . . . .
Figure 2-21 shows
EIA-232D. RXD is
Figure 2-20. Parallel Interface Block Diagram
the
serial interface circuit block diagram. The serial interface conforms to
data received by the serial 1/0 of the CPU block from the host commter via
driver/receiver
IC2. Data is trans%tted to an irmut buffer in the svstem IC from the Cl% block.
Printing starts when a CR code is received or whe~ the input but%r & filled.
Driver/Reciver (IC2)
SYSTEM IC (ICI)
TXD ●
365 Pm
DTR
PB3
RXD
35‘
Pcl
CTS
6.
~
I
Figure 2-21. Serial Interface Block Diagram
Rev.A
2-17

Epson LX-300 Specifications

General

Print Method	9-pin impact dot matrix
Interface	Parallel
Paper Handling	Friction feed, tractor feed
Weight	4.4 kg
Operating Environment	Temperature: 5 - 35°C, Humidity: 10 - 80%