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7-3-6.
Horizontal Amplitude Adjustment (VF-42 board)
Adjusting method:
1)
Rotate RV502, and adjust the top and bottom sides of the
monoscope
image to the top and bottom edges of the
display.
2)
Rotate RV504 so that the brightness is the normal level.
3)
Adjust the pattern (A) of the H size adjustment capacitor
(C504) to "short" or "open", so that the horizontal direction
over scan becomes 6 + 2% (Left and right totals). (Refer to
Fig. 7-26.)
Alignment tape:
For checking operations
(WRS-SNSP).
Monoscope section
rN
ae
LY
'74
ma
fe
Kae
EN
om
4
a
Fig. 7-25.
7-3-7.
Vertical Amplitude Adjustment (VF-42 board)
Alignment tape:
For checking operations
(WRS-5NSP)
Monoscope section
Adjusting Element
RV502
|
Specified Vai
Adjusting method:
1)
Adjust RV502
so that the vertical direction over scan
becomes 5 + 2% (Top and bottom totals).
mle
ace
Ny LN
Te)
AmVA
A
Nth
ml
an
im
|
EEE
-
lee
J a
sims
fata
ity +
4
KY
y
=
2.5%
16.5%
Fig. 7-27.
7-3-8.
Brightness, Contrast Adjustments
(VF-42 board)
Alignment tape:
'
For checking operations
Signal
(WRS-SNSP)
Monoscope section
AUSPE,
Brightness: RV504
Adjusting Element
Contrast:
RV503
Adjusting method:
1)
Rotate RV504 and RV503 alternately, and adjust so that the
bright/dark sections of the gray scale are displayed correctly.
(The bright section should be unsatisfactory till the cross
hatch appears vague in the monoscope circle. The dark
section should be unsatisfactory till the darkest section and
the second darkest section of the gray scale cannot be
differentiated.)
7-3-9.
Horizontal Amplitude, Vertical Amplitude,
Focus Check
"7-3-6. Horizontal Amplitude Adjustment" and "7-3-7. Vertical
Amplitude Adjustment" should both satisfy the specified values.
If not, perform the adjustments from the beginning again. In this
case, perform [7-3-8. Brightness, Contrast Adjustments] again.
Moreover, check the focus, and if it found to be vague, perform
"7-3-3. Focus Adjustment" and "7-3-4. Aberration Adjustment".
— 213 —
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