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PVM-8020
:
| PvM-8020
PVM-80:
VF-501
VF-501
VF-501
SECTION
4
CIRCUIT ADJUSTMENTS
4-1.
BA BOARD ADJUSTMENTS
HUE BIAS ADJUSTMENT
2.
Connect an oscilloscope to pin @) of the BA-6
3.
Turn
RV254
fully
counterclockwise,
then
slowly
return RV254 untill the waveform at pin @ of BA-6
connector begin to change.
SUB COLOR ADJUSTMENT
1.
Input a color bar signal.
PICTURE
80%
BRT
50%
COLOR
50%
2.
Adjust RV264
for the waveform
at connector BA-6
@
to become
as illustrated.
Adjust
for
"an even height
oscilloscope
APC ADJUSTMENT
digital
7.
Input a color bar signal.
multimeter
PICTURE
80%
BRT
50%
COLOR
50%
2.
Connect a 100 kQ. resistor between IC253 pin
(3)
and ground.
(Killor circuit goes off)
3.
Ground 1C253 pin
with a 10u/16V chemical
capacitor and remove
color sync.
4,
Adjust RV256 to get color sync.
KILLER POINT ADJUSTMENT
oscilloscope
1.
Tune in an off-air signal.
2.
Connect
digital
multimeter
between
R255
and
R378.
3.
Adjust RV255 so that the voltage is 8.3V dc.
CHROMA TRAP ADJUSTMENT
we ehrotpe Component
1.
Input a color bar signal.
PICTURE
80%
BRT
50%
2.
Observe
connector BA-6 pin @
waveform
on the
oscilloscope and adjust L252 for minimum
chroma
component.
—20—
—
=21—
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