Epson EPL-9000, Руководство по обслуживанию

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Service Manual
Operating Principles
2.2.1.7
Circuit
This circuit uses the receiver/driver to change the signal level from the
signal level to the signal level (O V or +5 V) or from the signal level to the
signal level.
The standard cell changes serial data to parallel data.
Parallel Data
--------------
..... ----------””-
Serial
Data
Transmit
. . .
Receive
Figure 2-43. Circuit
2.2.1.8 LocalTalk Circuit
The LocalTalk is an optional I/F board. It uses three (ICI),
and The changes parallel data to serial data or serial data to parallel data.
It is controlled by at the C135 MAIN board.
The and the which are signal level change changes a TTL signal
level to a LocalTalk signal level (compatible with signal level).
Cl
35 MAIN Board
CN7
Data Bus
Address
Bus
l/F Board (Option)
CN1
LocalTalk
DTR
.
RxD+/-
4
CTS
Figure 2-44. LocalTalk Circuit
2.2.1.9 Optional
This printer supports an EPSON Type-B optional interface, which is controlled by the INH and
signals from the
Rev. A
2-29