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3-4.
Audio/control
(A/C)
head adjustment
ded
and
k
Since the height of A/C head (service part
adjusted when the VCR leaves the factory,
do not turn
the height
adjustment
screw,
tilt
adjustment
screw or azimuth
adjustment
screw
unnecessarily.
Rough adjustment
Preparation
for Adjustment
Test
equipment/jig
State of VCR
Adjustment
points
Blank tape
> Run the blank tape.
Azimuth adjustment
screw
Height adjustment screw
-Tilt adjustment screw
Adjustment
procedure/adjustment
diagrams
1) Load a blank
tape and set
the VCR to the
playback mode.
2) Check that
there
is no conspicuous
curling or
riding
over
of the tape around
the A/C head,
If conspicuous curling or riding over, etc.
occurs,
adjust
the tilt adjustment
screw
and
azimuth adjustment screw.
AZIMUTH
ADJUSTMENT SCREW
GROOVE
FOR ADJUSTMENT
THE X-VALUE
A/C HEAD
RETAINING SCREW
HEIGHT
A/C HEAD BASE
ADJUSTMENT SCREW
RETAINING SCREW
A/G HEAD BASE (1)
A/C HEAD
BASE (2)
Ls
CHASSIS BASE
Precise
adjustment
Test equipment
Test equipment/jig
connection point
When adjusting the height of the A/¢ head
Set the VCR to the playback mode.
[f the height
of the A/C head drifts
greatly,
adjust
it by the
following procedure.
1) Adjust the height so the tape's bottom edge
is approximately 0.25mm above the bottom
edge of the control
head core.
2) Check that
there
is no conspicuous
curling or
riding over of the tape around the A/C head.
3) Continue the precise adjustment.
AUDIO HEAD
CONTROL HEAD
Approx.
0, 25mm
State of VCR
Adjustment points
Oscilloscope
Alignment tape
+ Azimuth
adjustment
screw.
+ Tilt adjustment screw
+ Height
adjustment
screw
+ Play alignment
tape
(Stairsteps
section)
Adjustment
procedure
1) Adjust the azimuth adjustment screw and tilt
adjustment
screw
alternately
little by little
so the audio
output
is maximum
and flat
(with
minimum fluctuations).
Supplement:
When
the A/C head
height
has been
adjusted,
also
adjust
the height
adjustment
screw
alternately
with
the azimuth and tilt adjustment
Screws.
Waveform
diagram
: Minimum
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