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ADJUSTMENT OF TAPE DRIVE TRAIN
Remove the cassette housing control assembly.
Make a short-circuit between TP8804 and
on the VCR PWB, with a 22 ohm resister. Now
turn on the power.
Check and adjust the position of the tension
pole. (See page 26.)
Check and adjust the video search rewind back
tension. (See page 25.)
Set the tilt angle of the A/C head. (See page 29.)
Rough adjustment of tape drive train.
a) Connect the oscilloscope to the test point for
the synchronism of the oscilloscope to EXT.
The PB CHROMA signal is to be triggered by
the head switching pulse (TP2204).
guide roller, and adjust it with an adjusting
screw driver (JiGDRIVERH-4) so that the guide
roller turns smoothly. (Do not overloosen the
setscrew, which causes insecurity of the guide
roller.) (See Figure l-35.)
on the reel disk, and place the unit in the
playback mode.
(Place a 500 g weight on the cassette tape to
prevent floating of the cassette tape.)
Guide roller
Figure l-35.
Electrical Adjustment), change the envelope
waveform from MAX to MIN, and MIN to MAX
by pushing the ( + ) or (-) tracking button, and
check a flat response is obtained on the
waveform.
adjust the guide rollers on the supply side and
take-up side using an adjusting screw driver
until a flat response can be obtained.
screwdriver to prevent the tape from
wrinkling at the upper and lower flanges of
the fixed guide.
above adjusting screw clockwise, as shown
in Figure 1-37 (a).
above adjusting screw counterclockwise, as
shown in Figure 1-37 (b).
Figure l-36.
Wrinkles at upper flange
Wrinkles at lower flange
Figure l-37.
Notes:
and adjust the X-position adjusting nut so that
the PB CHROMA envelop becomes maximum for
easier rough adjustment of the tape drive train.
attention to the outlet side.
Loosen the setscrew
Figure l-38.
Clockwise
Counterclockwise
X-position
adjusting nut
Figure l-39.
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