Panasonic PT51G36E - 51" PROJECTION TV Service-Handbuch - Seite 2
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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
B
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)
A
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.
A
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
B
GREEN
BLUE
B
A/B
A
B
A/B
A
Screen
B
Focus
B