Sony AV-3600 Service Manual page 96

5-1.
Maximum
Deviation
Adjustment
"Adjust
for: 1.0
V
(p-p)
video output with
3.3
MHz
to
4.7
MHz
modulator
input."
Procedure
A:
(page 5-2)
"6. Adjust
R
126 (Sync
Tip Carrier Freq.) for 3.3
MHz
as
indicated
on
the scope
screen.
a.
Adjust scope time base
for
1
usee
per division
(calibrated).
b.
Set
scope
controls to obtain a stable trace.
A
correct
carrier
frequency
of 3.3
MHz
is
indicated
when
there are
33 complete
square
waves
in
ten
divisions. Set
R126
to
produce
this
indication".
"12. Adjust
R155
so that
the negative spike
in the
vertical
blanking pulse
falls
30%
below
sync
tip
amplitude. See
Fig.
5-lb."
TP-105
-j.
i
i.i
i_
V
(50 %)
v
T
"A" V
60 Hz-
r
*****
30
T
^
V(30%)
Fig.
5-
1b.
White dip
and
dark
clip ieveis
Procedure B:
(page 5-3)
"5.
Adjust
R126
(Sync Tip
Carrier Freq.) for
a
stable
trace
of
3.3
MHz."
"6.
This trace indicates the
dc
level
of the modulator
input required
to
produce
3.3
MHz
at the
modulator
output."
*7.
Readjust
R126
for 4.7
MHz
as
indicated
on
the scope.
A
correct frequency of
4.7
MHz
is
indicated
when
there are 23.5 square waves
in
ten divisions
when
the time-base
is set
to
0.5
/xsec/cm."
'12.
Make
sure that a
carrier
frequency of about
3.7
MHz
is
indicated
on
the
scope with no
signal input."
TP-302
(3.3
MHz)
/»»
X
TP-105
Fig. 5-2a.
Waveforms
in
Steps
5
and 6
TP-302
(4.7
MHz)
\
TP-105
Fig.
5-2b.
Waveforms
in
Steps
7 and 8
modulator
input dc
level In
Step
8
producing 4.7
MHz
modulator output
4.7
MHz
3.3
MHz
modulator
Input dc
level In Step
6
producing 3.3
MHz
modulator output
Fig. 5-2c.
Maximum
deviation
setting