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R128 movable arm
Fig. 5-1
d. Connect
a monitor
set up
to receive
an
off-the-air telecast signal.
e. Check
to
see
that
the
sync
tip of the
composite
signal
sinks
below
the second
division
(See
Fig. 5-2)
by
approx.
0.5V.
Measure
the
exact
voltage
by which
the
sync
tip sinks
below
the champ reference
level set in Step 7-c (Fig. 5-2).
See Fig. 5-3.
Fig. 5-3
Sync tip level shift
f. Disconnect
the monitor.
Keep
the VTR
in the record mode.
:
g. Adjust
scope
STABILITY
to
observe
a
horizontal
trace
on
the same
position
as
seen on Fig. 5-2.
10.
12.
13.
14.
15.
16.
17.
18.
19.
h. Adjust
R128
so that the horizontal
trace
on
the
scope
moves
up
by
the
voltage
measured in Step 7-e (Fig. 5-3). See Fig. 5-4.
Fig. 5-4
Clamp level
Connect
scope
to TP-104.
Set
time
base
to
0.5us/cm,
and
check
that approx.
22 rectan-
gular pulses per
10 divisions
is seen
on the
scope.
Sync
tip clamp
level
is now
set to
3.8 MHz.
Note: No-signal
frequency
is
about
4.4 MHz (22 cycles) as a result of these
adjustments,
but
sync
tip
frequency
will be set correctly to 3.8 MHz.
Connect scope to TP-304. Set up 5 ms/cm range.
Connect a monitor.
Play back the video alignment
tape.
Adjust R343 (video output level) for 1.0 V(p-p).
Output level is now set to 1.0 V(p-p).
Thread
a blank tape instead
of the alignment
tape.
Record a telecast signal for approx.
15 seconds.
Play back the tape and check the video level.
If video
level is other
than
1V(p-p),
adjust
R106.
Turn R106
slightly
CW
if the video
level is less than 1.0 V(p-p).
Record
the
telecast
signal
again
and check
the video
level.
Readjust R106
until video
level is 1.0V(p-p).
This completes maximum
deviation
adjustments (3.8 MHz to 5.2 MHz).
Set up the record mode using a telecast signal.
Connect
scope to TP-102.
5-2
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