Crt Set Up; Dynamic Focus Adjustment; Electrical Focus Adjustment; Optical Lens Focus Adjustment - Panasonic TX-47P800HQ TX-47P800HZ Service Manual

7 CRT Set Up

Caution:
Insure yoke plugs on the A-Board are reconnected before
turning the Receiver ON to prevent damage to the
horizontal output transistor and/or CRTs.
7.1.

Dynamic Focus Adjustment

1. Focus adjustments should be performed after 1 hour of
aging.
2. Use oscilloscope with 100 : 1 probe.
3. Apply PAL monoscope pattern.
4. Set scan mode to 100Hz.
5. Set the picture menu to Dynamic.
6. Adjust the Red, Blue and Green focus VR on the focus
block for best focus of overall picture of each CRT. (Fig. 2)
7. Connect the scope probe to TPD20, GND to TPD21. Scope
set at 20V/div & 5m sec./div.
8. Adjust V-PARA (Service mode1) so that waveform (A) is
260V ± 20V. (Fig. 3)
9. Adjust H-PARA (Service mode1) so that waveform (B) is
560V ± 40V. (Fig. 3)
10. Set scan mode to PAL 100V Comp.
11. Set the picture menu to Dynamic.
12. Adjust V-PARA (Service model) so that waveform (A) is
180V ± 20V. (Fig. 3)
13. Adjust H-PARA (Service model) so that waveform (B) is
560V ± 20V. (Fig. 3)
14. Set scan mode to Progressive.
15. Repeat step 6-9.
16. Apply NTSC monoscope pattern.
17. Set scan mode to Progressive.
18. Repeat step 6-9.
19. Set scan mode to 100Hz.
20. Repeat step 6-9.
21. Apply monoscope pattern of PAL 1080i 50Hz.
22. Repeat step 6-9.
23. Proceed with Focus Adjustments.
Fig. 2
Fig. 3
7.2.

Electrical Focus Adjustment

1. Receive a monoscope pattern.
2. Cover the Red and Blue CRT, projecting Green only.
The electrical focus controls are located on the front. Adjust
the Green Focus VR for best focus of overall picture. (Fig.
2)
3. Repeat for Red focus VR while projecting Red only.
4. Repeat for Blue. (Best focus at bottom left corner of screen)
7.3. Optical Lens Focus
Adjustment
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 knurls locking knob.
(Fig. 4)
Fig. 4 (Rear view)
2. Turn the Receiver 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.
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TX-47P800HQ / TX-47P800HZ