Audio Head Azimuth Adjustment; Level Metering Setting; Playback Level Setting; Overall Frequency Characteristics - Sony AV-3600 Service Manual

SECTION
7
AUDIO
SYSTEM ALIGNMENT
7-1.
Audio
Head
Azimuth Adjustment
1.
Connect a
scope
or a
VTVM
to
TP-502
on
the
A
Board.
2.
Play
back
the 7
kHz
part of the
SONY
alignment
tape.
3.
Adjust the
Azimuth
and
Tilt
Adjusting
Screws
shown
in
Fig. 7-1 for
maximum
output.
azimuth
adjustment screw
tilt
adjustment screw
Fig. 7-
1.
Audio /CTL head azimuth
and
tilt
adjustments
7-2. Level
Meter
Setting
1.
Set the
VTR
to
Manual
in
the
E-to-E
mode.
2.
Feed
a
1
kHz
signal,
-65 dB
to the
MIC
IN jack
in
CAMERA
or
LINE mode
or
a
1
kHz
signal,
dB
to
the
AUX
IN
jack.
Terminate the
LINE
OUT
jack with
a
10
kO
resistor
and
connect a
VTVM.
Adjust the
LEVEL
control
on
the
control panel so that
the
LINE
OUT
level
is
dB.
3.
Adjust
R532
so that
the pointer of the
level
meter reads
on
the
right
edge of the black zone,
as
shown
in Fig. 7-2.
7-3.
Age
Level Setting
1.
Set
the
VTR
to
AGC
in
the E-to-E
mode.
2.
Terminate the
LINE
OUT
jack
with
a 10
kH
resistor
and connect
a
VTVM.
3.
Feed
a
1
kHz
signal,
-65 dB
to the
MIC
IN
jack
in
the
CAMERA
or
LINE mode
or
a
1
kHz
signal,
dB
to
the
LINE
IN
jack.
4.
Adjust
R533
to obtain a
meter reading of
dB.
7-4.
Audio
Bias Setting
1.
3.
7-5.
1.
2.
Feed
a
1
kHz,
-65 dB
signal
to the
MIC
IN
jack
or a
1
kHz,
dB
signal
to the
LINE
IN
jack.
Thread
a
tape
onto
the
Videocorder.
Connect
a
camera and
a
monitor
to
the recorder
and
a
VTVM
to
TP-504 on
the
A
Board.
Point the
camera
at
the
VTVM
so that the meter
indications
is
visible
on
the
monitor
in
the
Record
mode.
Make
a
recording of the input audio signal while
varying
C530 (on
the
A
Board) throughout
its
range very slowly.
Rewind
and play
back
the tape.
Watching
the
monitor, note the
level
on
the
meter (the
play-
back picture)
at
which output
is
greatest,
as
indicated
by
the
playback sound
level.
Set the
VTR
to the
Record
mode
again and
adjust
C530
for the reading that
gave
maximum
output during playback.
Set the
VTR
to
the
Audio
Dub mode
and
adjust
L401 on
the
SV
Board
for the
same
reading
(at
TP-504/
A
Board)
that
gave
maximum
out-
put during playback.
7-6.
1.
2.
Playback Level Setting
Connect
the
VTVM
to
the
LINE
using a
10 k£2 load
resistor.
OUT
jacl
Fig. 7-2.
Meter
setting
Play
back
the
1
kHz
part of the
SONY
Alignment
tape and
adjust
R519
so that the line
out
level
isOdB.
Overall
Frequency
Characteristics
Connect
the
VTVM
to
the
LINE
OUT
jacl
using
a
1
k£2 load resistor.
Feed
a
1
kHz
signal,
-65 dB
to the
MIC
IN
jacl
and
make
a
recording. Play
back
the tape
and