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[CRT Circuit]
6. Focus
Measuring
Instrument
Test Point
External Trigger
Measurement
Range
Input Signal
Adjustment
Sharpness of picture
purpose
Symptom when
Poor sharpness of picture.
incorrectly adjusted
VG-814 (No.14)
CHARA WINDOW
Note : This adjustment should be performed after adjustment 3 (Cut Off).
1. Supply a CHARA WINDOW signal (No.14).
2.
Press the "WINDOW" button on VG-814 to produce a crosshatch signal only.
3. Cover the Red and Blue Lenses with Lens caps to produce a Green
monochrome picture.
4. Adjust G (Green) on FOCUS controls of VR-FOCUS so that a black line and
peripheral 4 edges shown in enlarged Fig. 1 are best focused.
Note : VR-FOCUS is installed at the left bottom of the screen observing from the
front.
5. Cover the G (Green) and B (Blue) tube side (Lens) with Lens caps to produce
a Red monochrome picture.
Input Terminal Mini D-SUB 15 Pin Input Terminal
6. Adjust Red on the FOCUS controls in the same manner as the step 4.
7. Cover the tube side (Lens) of the Red and Green CRTs to produce a Blue
monochrome picture.
8. Adjust 8 (Blue) on the FOCUS controls in the same manner as shown in the
step 4.
9. Turn each front Lens of Green, Red, and Blue CRT Assemblies to adjust so
that the enlarged figure shown in Fig. 1 is best focused when producing a
Green or Red or Blue monochrome picture.
1 0. Confirm if the black line is visible in the entire screen in Fig. 1.
If not, adjust the steps 3 to 8 again.
Adjustment Point
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- .,
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Enlarged figure of Adjustment Points
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Each color line of
1
/
R,G andB
\
~~~~~-Black
Line
'r---.:-.. ./
~~
I~
Each color line of
-1
r--...._
R, G
and B
~-+1-~-r+-r+TB+-r+-P~r+-r~
'-........_
~-+1-~-r+-r+~+-r+~+-r+~~
~~=~=td:!d~;:t~=~=~4=}~~+=;~;~~~:jv----::=::::::=7
4 Sides Peripheral to the Screen
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Fig. 1
.000
~
Front Lens
Fig. 2
-22-
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