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KV-20/13VM30/31
RM-Y138/W
10-8. PRECISE ADJUSTMENT
A
:
Test Equipment
t
:
F
Test Equipment/Fixture
Connection Paint
VCR State
Adjustment Points
@ Oscilloscape
@ Audio output jack
@ Play an alignment tape
@ Azimuth Adjustment Screw
FN
ape
dece men! TOP NY
1KHz, 7KHz sections
@A/C Head adjuster
@ Alignment tapes
@ M3 Nut Driver
@ Cone point screw
Adjustment Procedure
1) Connect the probe of oscilloscope to audio output
jack
2) Adjust the Azimuth Adjustment Screw, A/C Head
adjuster and cone point screw slightly and alternately
so that an Audio 1KHz output is maximum
and flat.
(minimum fluctuation).
3) Adjust the Azimuth Adjustment Screw slightly and
alternately so that the Audio 7KHz output is maximum
Waveform Diagram
A.Maximum
— BB':Minimum
Fig. C-6-5
10-9. X-VALUE ADJUSTMENT
Purpose:To obtain compatibility with other VCRs
@ Oscilloscope
@CH-1 PB RF Envelope
@ Play an alignment tape
@ Adjust X
@CH-2 SW 30Hz
@ Alignment tapes
@ Head Switching Output
Test Point
@ Post Height Adjusting
@ RF Envelope Output
Driver
Test Point
RE SWITCHING
.
OUTPUT TEST POINT
rH
Aquetment Diagram
HEAD SWITCHING
OUTPUT TEST POINT
Adjustment Procedure
1) Insert a cassette tape, and then "AUTO TRACKING"
will be displayed on the Digitron, then push the Tra-
cking @ or © Keys one time as soon as possible to
make the VCR release the Auto Tracking
Turn the Adjust X to the maximum RF Envelope level
when the VCR is free from the Auto tracking
If RF envelope output is maximized from the center
click position in the right direction (clockwise), set the
tracking control to the center and turn the X Adjust
counterclockwise.
If in the left direction
(counterclockwise),
turn it
clockwise by the same method.
In case of the 30um, head will trace over a 604m
width track, readjust it so that RF Envelope output be-
gins falling at the same angle when tracking control is
turned either left or right
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