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[Deflection Circuit]
9. Raster Distortion
Measuring
Instrument
Test Point
External Trigger
Measurement
Range
Adjustment To set up the horizontal and vertical linearity of the picture.
purpose
Symptom when
incorrectly adjusted
Distorted picture in horizontal or vertical direction.
Note : This adjustment shall be performed repeatedly together with adjustment 5
(Raster Size).
1. Supply a Crosshatch with circle signal (No.12).
2. Press the "R" and "8" buttons on VG-814 to produce a Green monochrome
picture.
3. Press the "TEST', "1", "1", "8" buttons ·on the remote hand unit in that order to
activate the TEST 1 .1.8 mode.
Input Signal
VG-814 (No.12)
Crosshatch with circle
4. Press the "R/8" button to select the "CONV" adjustment mode.
5. Press the R button on VG-814 to display Red overlapped. Select the "0 HSTA"
and "1 VSTA" respectively to adjust the center of the screen to be overlapped
with the screen center.
Input Terminal Mini D-SUB 15 Pin lnpu!Terminal
6. Select the item "2 HPCC" (SI DE-PCC) and perform adjustments so that the
vertical lines on the left and right edges of the crosshatch are straight.
7. Select the item "62 VPCC" (T-8-PCC) and perform adjustments so that the
horizontal lines at the top and bottom edges of the crosshatch are straight.
8. Select the item "89 H 11" and perform adjustments so that the vertical lines on
the left and right edges are perpendicular. Repeat this adjustment and the
adjustment item "94 H21" by turns when not perpendicular.
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H11
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1-'----ll--+--+---11
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1---TI---t--!l---rl
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H21
9. Select the adjustment item "1 02 V11" and perform adjustments so that the
horizontal lines on the top and bottom edges are horizontal. If not horizontal
simultaneously, repeat this adjustment and the adjustment item "1 03 V12" by
turns.
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V11
----- V12
1 0. Unless the vertical lines on the left and right edges in the step 8 are straight,
adjust the adjustment item "91 H13" and "95 H22".
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H13
H22
Continued on next page.
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