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Sanyo M7790K - Page 9

Sanyo M7790K
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ELECTRICAL
ADJUSTMENTS
(continued)
Audio
Signal
Generator
1kHz
and
12kHz
Attenuator
31.5mV
(—30dB)
LINE
IN
Dummy
Load
47k
Oy)
LINE_OUT
OUTPUT
1kHz
>
1
2kHz,
(0.5dB
+1dB)
2.
Alternately
record
the
1kHz
and
12kHz
signals
from
the
audio
signal
generator
at
31.5mV
{—-30dB)
on
the
tape
several
times.
3.
Check
that
the
12kHz
signal
output
is
identical
to
the
1kHz
signal
output
or
the
deviation
is
0.5dB
(+1dB)
on
the
VTVM
while
playing
back
the
recorded
signals.
4.
If
necessary,
adjust
the
output
by
turning
the
potentiometer
(P101)
and
re-check
the
output
of
each
signal
by
playing
back
the
signals
after
recording
operation
of
the
signals.
5.
Repeat
the
above
adjustment
until
the
specified
output
is
obtained.
RIGHT
CHANNEL
Connect
the
audio
signal
generator
and
the
attenuator
to
the
right
channel
LINE
IN,
and
the
VTVM
to
the
right
channel
LINE
OUT.
Then,
adjust
the
potentiometer
(P201)
for
the
right
channel
by
following
the
same
procedure
as
in
LEFT
CHANNEL.
RECORD
&
PLAYBACK
SENSITIVITY
ADJUSTMENT
e
Metal
Tape
Set
the
Tape
Select
Switch
to
“METAL”
and
insert
a
metal
tape
(Example:
AC-7
11)
into
the
cassette
compartment.
Then,
perform
the
adjustment
by
the
following
procedure.
LEFT
CHANNEL
1.
Connect
an
audio
signal
generator
and
an
attenuator
to
the
left
channel
LINE
IN,
and
a
VTVM
to
the
left
channel
LINE
OUT
as
illustrated.
Audio
Signal
Generator
1kHz
Attenuator
LINE
IN
2.
Set
the
unit
in
the
record
stand-by
mode
by
pressing
the
Pause
Button
first,
and
then,
the
Record
and
Play
Buttons
simultaneously.
3.
Feed
a
1kHz
signal
from
the
audio
signal
generator
into
the
unit
and
adjust
the
attenuator
until
the
VTVM
reads
300mV
(~12dB).
Then,
record
the
signal
on
the
tape
by
releasing
the
Pause
Button.
4.
While
playing
back
the
recorded
signal,
check
that
the
signal
output
is
300mV
(—12dB)
on
the
VTVM.
5.
If
necessary,
adjust
the
potentiometer
(P103)
and
re-check
the
reading
of
the
VTVM
by
playing
back
the
signal
after
the
recording
operation
for
the
signal.
6.
Repeat
the
above
adjustment
until
the
specified
output
is
obtained.
RIGHT
CHANNEL
Connect
the
audio
signal
generator
and
the
attenuator
to
the
right
channel
LINE
IN,
and
the
VTVM
to
the
right
channel
LINE
OUT.
Then,
adjust
the
potentiometer
(P203)
for
the
right
channel
by
following
the
same
procedure
as
in
LEFT
CHANNEL.

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