Modifications; Adjustment; Picture Resolution Up; Audio Manual Control - Sony AV-3600 Service Manual

SERVICE
MANUAL
AV-3600
SUPPLEMENT
SUBJECT:
Picture
Resolution
Up and Audio Manual
Control
APPLICABLE
SERIAL
NUMBER:
Picture
Resolution
Up
..
..39,601
and
later
Audio Manual Control
52,101 and
later
No.
1
AUG. '71
"x
<L
1.
MODIFICATIONS
1-1.
Picture Resolution
Up
The following changes have
been
made on
the
machine, to assure
the
picture resolution better
than
300
lines
and
to
improve the picture quality.
(1)
To
change
the time-constant of the low-pass
filter
in
the
Modulator Drive
Amplifier
(V2
board),
for
the wider
frequency
re-
sponse
in
high
frequency range.
(2)
To
change
the time-constant of the low-pass
filter
in
the
next
stage
of the
Demodulator
Circuit,
for the
wider frequency response
in
high frequency range.
(3)
To
shift
up the
FM
Carrier
Frequency
for
100 kHz.
Sync
Tip frequency
>
from
3.2
MHz
to 3.3
MHz
White Peak frequency
from
4.6
MHz
to 4.7
MHz
(4)
To add
to the
Video Output Amplifiers
(Q307/Q308)
in
VI
board,
a
compensation
circuit
for
middle frequency range
(1.6
MHz
to
2 MHz).
(5)
To
rise
up
the
frequency response of the
PB
Amplifier
(V2 board)
for
about
2
dB,
which
has
been
flat
up
to
high frequency.
(6)
To
decrease the
Dark
Clip
Level
from
50%
to
30%.
1-2.
Audio Manual Control
AUDIO
MANUAL
Function
is
featured ad-
ditionally
to the
AGC
Operation.
(1)
The
"A
BOARD"
is
replaced
by the
"A
BOARD"
used
in
AV-3650.
,
(2)
An
Audio Level Meter,
Audio
Level Control
and
AGC
*+
MANUAL
Selection
Switch
are
added.
AGC/MANU
switch
AUDIO LEVEL
cdntrol
AUDIO
LEVEL meter
2.
ADJUSTMENT
The
following adjustment are
changed,
Sec. 5.
VIDEO SYSTEM ALIGNMENT
5-1.
Maximum
Deviation
Adjustment
5-4. Playback Preamplifier
Adjustment
Sec.
7.
AUDIO SYSTEM ALIGNMENT