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[Deflection Circuit]
5. Raster Size
Measuring
Instrument
Test Point
External Trigger
Measurement
Range
Adjustment To set the linearity in horizontal and vertical directions in the picture.
purpose
Symptom when
Distorted picture in horizontal or vertical direction.
incorrectly adjusted
1. Supply a crosshatch with circle signal (No.12).
2. Press the "R" and "B" buttons on VG-814 to produce a Green monochrome
picture.
3. Press the "TEST", "1 ", "1 ", and "8" buttons on the remote hand unit in that order
to set to the TEST 1.1.8 mode.
4. Press the "R/B" button to select the item "V-WIDTH" in the "DAC" adjustment
mode.
5. Set the initial data for "V-WIDTH" to "0". ("
<C"
or"~"
button)
Input Signal
VG-814 (No.12)
Crosshatch with circle
6. Press the "R/B" button on the remote hand unit to select the "CONV"
adjustment mode.
Input Terminal Mini D-SUB 15 Pin Input Terminal
7. Confirm that each adjustment data of the adjustment items "HWID", "VWID" and
"VLIN" is "12T'.
8. Press the "R/B" button to select the "H-POSI" and "V-POSI" again in the "DAC"
adjustment mode respectively.
9.
Perform adjustments so that the center of the picture is at the screen center.
(" <C"
or
"~"
button)
Note : The position of the screen center should be 453mm away from the Top
Board of the product and 570mm away from the Side Board.
1 0. Adjust the "H-WIDTH" and "HLIN" in the "DAC" adjustment mode of the TEST
1.1.8 mode so that A point in Fig. 1 is overlapped with the left and right frame of
the screen.
11. Adjust VR452 (Vertical Height) and VR451 (Vertical Linearity) so that B point
shown in Fig. 1 is overlapped with the top and bottom frame of the screen.
12. Confirm the steps 8 to step 11 again.
PCB-DEFL V (COMPONENT)
13. Adjust the "H-POSI" and "V-POSI" of the "DAC" adjustment mode in the TEST
1.1.8 mode so that 1 line of 4 sides of the Picture (mark
0)
shown in Fig. 2
goes to hide on the Screen Edge without any return.
i!I)VR452
i!I)VR451
IC451
14. After adjustment, press "ENTER" to write the data into memory.
15. Press the ''TEST" button to terminate the TEST 1.1.8 mode.
Note :
If there is a return in the step 13, perform adjustment 4 (Centering) again.
, ,
~
Raster Size
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'----~-----
Screen
;
Edge
'.....A
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I
I
I
B
B
"'
"
I
/
I
- /
I
I
I
A.
I
I
I
I
\
I
I
I
- - - - - - · - - - - - -
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I
L-/_,...<:.--------'-'...,,::-' \
/
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....
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""
' , \
~,""
'~
Fig.1
-21-
/Screen Edge
... V
Picture
(_~
Fig.
2
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