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