Panasonic PT51G36E - 51" PROJECTION TV 서비스 매뉴얼 - 페이지 2

{카테고리_이름} Panasonic PT51G36E - 51" PROJECTION TV에 대한 서비스 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Panasonic PT51G36E - 51" PROJECTION TV 27 페이지. Color video projection system

페이지 인쇄

CAUTION: Insure yoke plugs on the A-Board

are reconnected before turning the PTV

ON to prevent damage to the horizontal

output transistor and/or CRTs.

1. Connect test generator to the antenna terminal and

set for a monoscope pattern.

2. Loosen yoke clamp, seat yoke against bell of CRT

and rotate to correct yoke tilt (compare to adjacent

CRT). Tighten yoke clamp.

3. Remove adhesive from centering tabs and set

centering tabs for zero correction. (Figure 21)

Centering Magnets

Figure 21. Adhesive Removal

4. Cover replacement CRT lens and static converge

the tubes not replaced, if needed. Check size and

linearity of pattern and adjust as required.

5. Uncover replacement CRT lens and cover other

two CRT lenses. Adjust electrical and optical focus

(lens), if required.

6. Uncover all CRT lenses and use yoke centering

magnet to converge replacement CRT (in center

area of screen only) with other two CRTs.

Disregard non-convergence in areas other than

center area.

7. Perform White Balance adjustments.

Dynamic Focus Adjustments

1. Focus adjustments should be performed after 1

hour of aging.

2. Use oscilloscope with 100 : 1 probe.

3. Apply monoscope pattern.

4. Adjust the red, blue and green focus VR on the

focus block for best focus of overall picture of each

CRT. (Figure 24)

350_V ± 100_V

Figure 22. D. Focus Adjustment Waveform

5. Connect the scope probe to TPA16, GND to

TPA17. Scope set at 20V/div & 5m sec/div.

6. Confirm that level of A is 550_V ± 100_V and B is

350_V ± 100_V.

If level of A and B are not within the specification adjust

as follows:

1. Enter to DAF-MODE as follows:

Service Manual

CRT Set Up

Adhesive

16.7ms (V Rate)

550_V ± 100_V

- 16 -

•

On Service Mode DAC V02 press Vol

2. DAF4 (H_DAF) appears, adjust by pressing

Vol

until waveform is within specification.

3. Set DAF6 (V_DAF) by pressing TV/VIDEO on the

remote until appears.

4. Adjust by pressing Vol

within specification.

5. Then press ACTION (Menu appears), press

ACTION to save changes or other button to exit

without saving.

6. Proceed with Focus Adjustments.

Focus - Electrical & Optical Adjustments

(use for minor adjustment or for final adjustment,

for complete adjustment see following section.)

Electrical Adjustment

1. Apply NTSC monoscope pattern.

Adjust electric focus VR

and lens focus on this circle

Figure 23. Lens focus adjustment

Table 4: Focus Points

RED

Electric focus

Optical Focus

2. Cover the green and blue CRTs, projecting red

only. The electrical focus controls are located on

the front (Figure 23). Adjust the red focus VR for

best focus as indicated in Table 4).

+ + +

R G

+ +

R G

Figure 24. Focus Pack

3. Adjust red lens focus (mechanical) until focus is

best.

4. Adjust red focus VR again.

. until waveform is

GREEN

BLUE

A/B

Screen

Focus