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Service Adjustments (Electronic Controls, cont.)
Deflection Adjustments
Note:
V-S, V-Size Adjustment
Deflection adjustment for RF, 1080i,
480p, doble window mode are
provided differently.
H Center Adjustment
Preparation:
1. Apply a crosshatch pattern.
Procedure:
1. If horizontal linearity is poor, in Serviceman Mode,
adjust data “H LIN” (See Fig. 32)
Preparation:
1. Apply a Crosshatch pattern.
Procedure:
1. Apply a crosshatch pattern.
2. Enter Serviceman Mode
3. Check a and b sizes, If b-a < -1.5mm (in top &
bottom extending case)
a. Increase “V-S” DATA by one step .
b. Adjust “VEAMP” so that V-SIZE is regular size
again.
Note: Repeat “a” and “b” until b-a ± 1.5mm
4. Check a and b sizes, If b-a > -1.5mm (in top &
bottom shortening case)
a. Decrease “V-S” by one step.
b. Adjust “VEAMP” so that V-Size is regular size
again.
Note: Repeat “a” and “b” until b-a ± 1.5mm
5. Confirm to make outermost circle of monoscope
pattern a correct circle.
Figure 32. H-Adjustment
a
2. Apply a Monoscope pattern.
3. If the horizontal center is not aligned, in
Serviceman Mode adjust “H POS” DATA to adjust
the horizontal center of the monoscope pattern to
the CRT center.
b
Vertical Linearity(V-C), V-Size and
V-Position Adjustment
Figure 34. V-Adjustment
Preparation:
1. Apply a Crosshatch pattern
Procedure:
1. Enter Serviceman Mode, Select DAC adjustment
“V RAS” and adjust crosshatch pattern to center
vertical position to the CRT center.
2. Adjust linearity data “V-C” so that interval of “a” is
same as “b” (a=b). (See Fig. 33)
Trapezoid, Parallelogram and E-W PCC
Adjustment
Trapezoid Adjustment
Preparation:
1. Apply a Crosshatch pattern
2. Normalize the Picture Icon Video adjustments.
Procedure:
1. Enter Serviceman Mode, select “TRAP” and Adjust
DATA so that lines at right and left are vertical like a
solid line (See Fig. 35)
a=b
a
b
Min. Adjustment
Figure 33. Linearity adjustment
Correct Adjustment
Max. Adjustment
Figure 35. Trapezoid Adjustment
3. If the v-position is not at the CRT center, adjust V
position “V RAS” DATA again.
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