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7-3-4.
Aberration Adjustment
Mode
E-E
Signal
Dot pattern
Specified Value
T<2•D
F<D
Note: Refer to
~·9-1~3
How to set the.RECJpode in the
model without REC switch" in VIDEO SECTION
ADJUSTMENTS.
Adjusting method:
Order
Procedure
Adjust the aberration adjustment ring so that the
tracing of the dot becomes less than twice the
diameter of the dot, or the fan aberration becomes
less than the diameter of the dot.
2
If the centering becomes displaced here, perform
the centering adjustment from the beginning again.
T<2•D
F<D
Fig. 7-19.
7-3-5.
Horizontal Oscillation Frequency Adjustment
(VF-42 board)
Mode
Playback
Alignment tape:
Signal
For checking operations
(WR5-5CSP)
Measurement Point
Positive pole terminal of C516
Measuring Instrument
Digital voltmeter or oscilloscope (DC
range)
Adjustment Element
RV501
Specified Value
2.30
±
0.05 V de
Adjusting method:
~--------------------------~
Order
Procedure
Adjust to 2.30
±
0.05 Vdc using RV501.
7-3-6.
Horizontal Amplitude Adjustment (VF-42 board)
Mode
Signal
Playback
Alignment tape:
For checking operations
(WR5-5CSP)
Monoscopesection
Adjusting Element
Specified Value
6 ±2%
Adjusting method:
Order
r---------------------------~
Procedure
Rotate RV502 on the VF-42 board, and adjust the
top and bottom sides of the monoscope image to
the top and bottom edges of the display.
2
Rotate RV504 on the VF-42 board so that the
brightness is the normal level.
3
-194-
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).
-1
f-
12.5%
D
Fig. 7-20.
®
Oo
12.5%
VF-42
board (Component side)
Section A
Slze.H
Open
Small
Short
Big
Fig. 7-21.
7-3-7.
Vertical Amplitude Adjustment (VF-42 board)
Mode
Signal
Playback
Alignment tape:
For checking operations
(WR5-5CSP)
Monoscopesection
Adjusting Element
RV502
Specified Value
5
±2%
Adjusting method:
r-------------------------------~
Order
Procedure
7-3-8.
Mode
Signal
Adjust RV502 so that the vertical direction over
scan becomes 5
±
2% (Top and bottom totals).
2.5%
16.5%
Fig. 7-22.
Brightness, Contrast Adjustments
(VF-42 board)
Playback
Alignment tape:
For checking operations
(WR5-5CSP)
Monoscopesection
Adjusting Element
Brightness: RV504
Contrast: RV503
Adjusting method:
r---------------------------~
Order
Procedure
Rotate RV504 and RV503 alternately, and adjust
so that the bright/dark sections of the gray scale are
displayed correctly. (The bright section should not
be so bright that the cross hatch in the monoscope
circle appears vague. The dark section should not
be so dark that 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".
-195-
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