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n
5-3-2.
ADJUSTING
THE GUIDE
ROLLER
(Refer
to Fig. 5-3-2
and Fig. 5-3-3.)
.._
(1) Play the alignment
tape (NTSC:VHJ-OO06,
PAL:VHJ-
0009)
and check that the envelope
waveform
has
become
maximum
using the tracking
center. Then
L
rotate the "assy, roller, guide" of the supply and take
up sides in the counterclockwise
direction
to loosen
them,
and then tighten
them
alternately
until the
envelope
waveform
becomes
flat. If the envelope
waveform
is not maximum
at the tracking
center,
refer to section
5-3-3,
and temporarily
adjust
the
"tracking
(X value)"
of the "assy, head r/p ace VC".
Note: Pressing the "CHANNEL+
(A)"
and CHANNEL
- (7)
tracking
buttons together
resets to the
tracking
center.
(2) Adjust the "assy, roller guide"
at the supply side.
1)
Press the tracking
button
(channel
- (v)),
and
check that when the envelope
waveform
is set
to the maximum
30 to 507., the first half of the
envelope
waveform
is not flat.
If not flat, finely
adjust the "assy, roller guide"
of the supply
side according
to the following
procedure.
u.
a.
b.
If the first half of the envelope
waveform
is
as shown in Fig. 5-3-3 (a), as the "assy, roller,
guide"
of the
supply
side
is pressed
excessively,
loosen the "assy, roller, guide"
of the supply side to set the state shown
in
Fig. 5-3-3 (b), tighten
again until the position
that the envelope
waveform
becomes
flat.
If the first half of the enveloDe
waveform
is a
(4) When set to F-SEARCH + PLAY, R-SEARCH -+ PLAY,
check that the envelope
waveform
does not change.
1)
2)
If the
first
haif"of
the
envelope
wavefo~m
changes,
tighten
the "assy, roller, guide"
of the
supply
side in the clockwise
direction
by up to
20°.
If the
latter
half
of the
envelope
waveform
changes,
adjust the "assy, roller, guide"
of the
take up side of step (3) again.
Pressed
Pressed
Normal
excessively
inadequately
Eccentric screwdriver
(VI-IJ- 0003)
\
Take up side
P
Supply side
"assembly, roller, guide"
"assembl
'L
Adjust so that the envelope
waveform
becomes flat
when maximum
at the
radial
shape
as shown
in Fig.
5-3-3
(c),
tightening
the "assy,
roller,
guide"
of the
supply side even further will not correct the
radial
shape
as shown
in Fig. 5-3-3
(d). in
some cases, the flat part will bend in. In such
cases, since the state shown in Fig. 5-3-3 (c)
is normal,
loosen the "assy, roller, guide" of
the supply
side, and tighten
again until the
envelope
waveform
becomes
as shown
in
Fig. 5-3-3 (c).
2)
Check that the output
of the first
half of the
'L
envelope
waveform
is below
80%
of the
maximum
part at the tracking
center.
3)
Rotate the "assy, roller, guide" of the supply side
in the counterclockwise
direction
by 20°.
(3) Adjust the "assyr roller, guide"
of the take up side.
Adjust so that the tape path along the cylinder lead face.
1)
2)
Press the tracking
button
(channel
- (~)),
and
check that when the envelope
waveform
is set
to the maximum
30 to 50%, the latter half of the
envelope
waveform
becomes
flat.
If not flat,
slightly loosen the "assy, roller, guide" of the take
up side, and then slightlvtighten
until it becomes
flat.
Check that the output
of the latter
half of the
envelope
waveform
is maximum
at the tracking
center. If not maximum,
finely adjust the "assy,
roller, guide"
of the take up side.
tracking center.
ml"'
+
(a) Supply side "assembly,
roller, guide"
is excessively
pressed.
(c) When the radial
waveform
is normal.
D@50'0
Fig. 5-3-2
Normally, the envelope
waveform
becomes flat even
at 30
tO
50'%0.
~T"
-
5"%
—1
(b) Take up side "assembly,
guide" is inadequately
pressed.
~–
roller.
w~-'"'"
{d) Supply side "assembly, roller,
guide" is excessively
pressed.
p~"'"
Fallen part
Fig. 5-3-3
L
L
-31-
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