JVC TK-C675BU Service Manual page 17

Measuring
No. Item instrument &
Input signals
10 Color • Color bar chart
difference (just scan)
balance(2) • Oscilloscope
adjustment (H-rate, 10:1)
• Vectorscope
0.65 Vp-p
11 Carrier • Vectorscope
balance • It is not neces-
adjustment sary the infinity
adjustment lens
for this adjust-
ment.
12 Burst phase • Vectorscope
adjustment
(E Ver. only)
Measuring point (
Adjustment parts (
Mode
Adjustment level (
VIDEO output
LENS IRIS
0.65Vp-p
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
VIDEO output
31h (1H delay gain
(Cyan))
Chroma (colored) dots
should be superim-
posed.
VIDEO output
27h
(Blue carrier balance)
28h
(Red carrier balance)
R-Y R-Y
B-Y
R-Y
B-Y
VIDEO output
2Ah (Burst phase)
Angle of burst phase
is 90 degrees.
)
)
Adjustment procedure
)
1) Set lens iris so that the white level of the color
bar chart is 0.65Vp-p.
2) Adjust the 1H delay gain (Cyan) data so that
the dots of different colors are superimposed
on the vectorscope.
1) Close the lens iris.
2) Adjust the Blue carrier balance and Red car-
rier balance data alternately so that the dot
on the vectorscope is center.
(It is recommended to be easier to see that
the gain of vectorscope is boosted.)
B-Y
1) Close the lens iris.
2) Adjust the Burst phase data so that the angle
of burst phase is 90 degrees on the
vectorscope.
90° 90°
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