Panasonic TX-43P800X / TX-43P800HM / TX-43P800HQ / TX-43P800HZ / TX-51P800X / TX-51P800HM / TX-51P800HQ Service Manual ▷ View online
7 CRT Set Up
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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.
to the horizontal output transistor and/or CRTs.
7.1 Dynamic Focus Adjustment
7.2 Electrical Focus Adjustment
7.3 Optical Lens Focus Adjustment
7.4 Centering Magnet Adjustment
7.5 Alignment magnet Adjustment
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7.1 Dynamic Focus Adjustment
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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
)
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 380V ± 20V. (
Fig. 3
)
9. Adjust H-PARA (Service mode1) so that waveform (B) is 560V ± 40V. (
Fig. 3
)
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. Proceed with Focus Adjustments.
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7.2 Electrical Focus Adjustment
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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. (
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)
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