
ADJUSTMENT OF TAPE DRIVE TRAIN
Remove the cassette housing control assembly.
Check and adjust the position of the tension
pole. (See page
Check and adjust the video search rewind back
tension. (See page
Set the tilt angle of the A/C head. (See page
Rough adjustment of tape drive train.
Connect the oscilloscope to the test point for
envelope output
Set
the synchronism of the oscilloscope to EXT.
The
signal is to be triggered by
the head switching pulse
Loosen the setscrew at the lower part of the
guide roller, and adjust it with an adjusting
screw driver
so that the guide
roller turns smoothly. (Do not overloosen the
setscrew, which causes insecurity of the guide
roller.) (See Figure
Set the alignment tape (monoscope pattern)
on the reel disk, and place the unit in the
playback mode.
(Place a
g weight on the cassette tape to
prevent floating of the cassette tape.)
Guide roller
Hexagon
Figure
Figure
Change the envelope waveform from MAX to
and
to MAX by pushing the
or
tracking button, and check a flat response
is obtained on the waveform.
a flat response cannot be obtained, roughly
adjust the guide rollers on the supply side and
take-up side using an adjusting screw driver
until a flat response can be obtained.
Turn the
head tilt adjusting screw with a
s c r e w d r i v e r t o p r e v e n t t h e t a p e f r o m
wrinkling at the upper and lower flanges of
the fixed guide.
Wrinkles at the upper flange Turn the
above adjusting screw clockwise, as shown
in Figure
(a).
Wrinkles at the lower flange : Turn the
above adjusting screw counterclockwise, as
shown in Figure
Wrinkles at upper flange
Clockwise
Wrinkles at lower flange
Counterclockwise
Figure
Notes:
Place the tracking control in the center position,
and adjust the X-position adjusting nut so that
the
envelop becomes maximum for
easier rough adjustment of the tape drive train.
In the rough adjustment, pay particular
attention to the outlet side.
. .
Loosen the setscrew
Figure
X-position
adjusting nut
Figure
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