Panasonic PT51G36E - 51" PROJECTION TV Manuel d'entretien - Page 3

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5. Repeat for blue focus VR while projecting blue

only.

6. Repeat for green.

Focus - Optical Lens Adjustment

Optical Adjustments

Note: This adjustment normally should not require

resetting unless the lens has been replaced or

adjustment has changed.

1. Optical focus adjustment is located on the top of

each CRT lens system. Loosen the adjustment

knurled locking knob. (Figure 25)

Adjustment knurled

locking knobs

REAR VIEW

Figure 25. Optical Lens focus Adjustment

2. Turn the PTV ON. Apply and view a monoscope

pattern.

3. Adjust each lens focus for best focus while viewing

each CRT.

4. Cover the red and blue CRT, projecting green only.

Rotate the green lens for best focus around screen

center area.

5. Do the same for the red focus lens while projecting

red only.

6. Repeat for blue.

Electric & VM Focus Adjustment,

Complete adjustment

(Perform this adjustment when a CRT is replaced

or when major adjustment is required)

Preparation:

1. NTSC monoscope pattern.

2. NTSC cross hatch pattern with dots (pincushion).

3. Set DAC D0f from 0 to 1 (disabling digital

convergence.)

- 17 -

4. Position the longer tab of the four-pole magnet to

degrees

(uncorrected

Figure 27).

Figure 26. VM Coil with focus

correction magnet

Figure 27. 4-pole magnet

5. Position the long tab of all alignment magnets and

of the dummy ring together in an uncorrected

position. (See Figure 28).

Figure 28. Alignment magnet

(or dummy ring)

Procedure:

1. Apply an NTSC cross hatch pattern with dots.

2. Assure that digital convergence is disabled (Dac

D0F from 0 to 1).

3. Project red only. (Cover green and blue CRTs.)

4. Turn the red electrical focus adjustment VR (on

focus pack) fully counterclockwise and note the

position of the dots at the center of the picture.

5. Turn the red electrical focus adjustment VR

fully clockwise.

6. If the position of the dots at the center of the screen

moves from the position noted in step 4., adjust the

four pole magnets until the dots are in the same

position as noted in step4.

7. Turn the red electrical focus adjustment VR (on

focus pack) fully counterclockwise and confirm that

the position of the dots at the center of the screen

did not move from their position noted in ste p6.

8. If the position of the dots at the center of screen

moved, repeat from step 4.

position).

(See

6-pole magnet

(Dummy ring)

4-pole magnet

Alignment magnet

Set 90 degrees

Service Manual