Crt Set Up; Dynamic Focus Adjustment; Electrical Focus Adjustment; Optical Lens Focus Adjustment - Panasonic TX-47P500HM Service Manual

TX-47P500HM / TX-47P500HQ / TX-47P500HZ / TX-47P500X

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 monoscope pattern.
4. Adjust the Red, Blue and Green focus VR on the focus
block for best focus of overall picture of each CRT. (Fig. 2)
5. Connect the scope probe to TPD20, GND to TPD21. Scope
set at 20V/div & 5m sec./div.
6. Adjust V-PARA (Service mode1) so that waveform (A) is
380V ± 20V. (Fig. 3)
7. Adjust H-PARA (Service mode1) so that waveform (B) is
560V ± 40V. (Fig. 3)
8. Proceed with Focus Adjustments.
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)
Fig. 2
Fig. 3
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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