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b. In the case where
the cassette
tape is positioned
close
to the helical
lead
position,
the envelopes
will be as shown below.
Supply side
(Drum''s entry)
Take-up side
(Drum's outlet)
D
:
Figure 75-C
© Switching point adjustment
1. Triggering the output signal with switching pulse, ob-
serve
the waveform
of output
at the video
output
terminal.
Adjust so that the distance from the V-sync
front end to the switching point becomes 6.5 H + 0.5
H.
Carry it out for both channels (CH1
and CH2).
See Fig. 75-D.
|
Switching pulse
Switching pulse
2
Switching
point
V-sync. front end
Figure 75-D
64
@ Fine adjustment (2)
1.
Finely
adjust the guide roller's height so as to have
the envelope
as flat as possible.
Check,
then, that
such
a flatness is not affected
even
with a rotation
of the tracking knob.
Check,
with
a rotation
of the
tracking knob,
that
the ratio of A against B (of Fig. 75-E) is held at 10: 7.
Put the unit in RECORD
mode (to record colour bar
signal), reproduce
it and
check
that the envelope is
flat.
. After
the
adjustment,
tighten
the
setscrew
of the
guide roller firmly.
. Again check for the RF envelope.
Outlet
Maximum
Maximum
A:B
= 10:7
Envelope's flatness
Figure 75-E
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