Deflection Adjustments; H Center Adjustment; Vertical Linearity(V-C), V-Size And V-Position Adjustment; V-S, V-Size Adjustment - Panasonic CT-32HX40B Service Manual

Service Adjustments (Electronic Controls, cont.)

Deflection Adjustments

Note: Deflection adjustment for RF, 1080i,
480p, doble
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)
Figure 32. H-Adjustment
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.
Vertical Linearity(V-C), V-Size and
V-Position 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)
a=b
a
b
Figure 33. Linearity adjustment
3. If the v-position is not at the CRT center, adjust V
position "V RAS" DATA again.
window mode are
- 26 -

V-S, V-Size Adjustment

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
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
5. Confirm to make outermost circle of monoscope
pattern a correct circle.
a
b
Figure 34. V-Adjustment
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)
Min. Adjustment
Correct Adjustment
Figure 35. Trapezoid Adjustment
 
± 1.5mm
b-a
 
± 1.5mm
b-a
Max. Adjustment