Panasonic TX-51P100X, Service Manual

Page: 12 / 108

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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.
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 TPF1, GND to TPF2.
Scope set at 20V/div & 5m sec./dev.
6. Adjust R741 VR so that waveform (A) is 380V ±
20V. (Fig. 3)
7. Adjust R726 VR so that waveform (B) is 580V ±
30V. (Fig. 3)
11. Proceed with Focus Adjustments.
Focus - Electrical 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)
Focus - Optical Lens 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)
2. Turn the Receiver ON apply and view a mono-
scope 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 project-
ing Red only.
6. Repeat for Blue.
+ + +
+ + +
B G R
B G R
Screen adj. VR (3)
Focus adj. VR (3)
Focus Pack
Fig. 2
0
(B)
(A)
Fig. 3
Adjustment knurled
locking knobs
B G R
Optical lens focus adjustment
Fig. 4
(Rear view)