Hitachi MB-6890, Руководство по обслуживанию

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549
ACM
Peripheral
circuit
7.
Cassette Remote control
circuit
Fig 6-40 shows the
cassette remote control circuit. This circuit is
to
control the
operation of
remote
terminal in
cassette recorder. The remote
terminal
of the
cassette recorder is
usually connected to
power
supply of the recorder.
Ry
ON/OFF
of the
relay RLI, remote
terminal is closed
and/or opened
then
cassette recorder
operation
is
controlled.
ICl26
output Q becomes
"H"
level when
REMOTE
and D7
are
"H" level. Then transistor
Q4
goes
ON
and the
cassette recorder becomes
in
operable state by closed relay. If
REMOTE and D7
are
"L" level, the
cassette
recorder is
non
operable.
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Fig.
54
Cassette
remote
control circuit
6-8-2 Printer
Interface Circuit
In printer interface
circuit,
PIA (Peripherals Interface
Adaptor:
use
for data
output.
HD4682lP) is in
Fig. 6-41 shows the printer interface
circuit.
STRB is the
control signal which inform
the printer that the
data
is
outputted
on
peripheral data bus PBo-PB7.
This
signal is
outputted
from CB2 of
PIA through the buffer.
BUSY"becomes"H"
level
when the printer is in
the
process
of data transaction
and
then
If’
level when
finished.
During this time,
ACK
becomes"L"level1
CBl
is
the OR input control
signal of
BUSY and ACK and inform
that the
printer
receivedthe
data and
print
output
is
done.
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