Read Panasonic TX-47PT1F (serv.man2) Service Manual online
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12
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TX-47PT1F
CRT Set Up
Caution: Insure yoke plugs on the A-Board are recon-
nected before turning the Reciever ON to prevent
damage to the horizontal output transistor and/or
CRTs.
nected before turning the Reciever 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 patern.
2. Loosen yoke clamp, seat yoke against bell of CRT
and rotate to correct yoke tile (compare to adjacent
CRT). Tighten yoke clamp.
CRT). Tighten yoke clamp.
3. Remove adhesive from centering tabs and set
centering tabs for zero correction. (Fig. 1)
4. Cover replacement CRT lens and static converge
the tubes not replaced, if needed. Check size and
linearity of pattern and adjust as required.
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.
(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. Disre-
gard non-convergence in areas other than center
area.
area of screen only) with other two CRTs. Disre-
gard non-convergence in areas other than center
area.
7. Perform White Balance adjustments.
Dynamic Focus Adjustmenet
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
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)
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 260V ±
20V. (Fig. 3)
7. Adjust R726 VR so that waveform (B) is 570V ±
20V. (Fig. 3)
11. Proceed with Focus Adjustments.
Focus - Electrical Adjustment
1. Cover the Red and Blue CRT, projecting Green
only.
The electrical focus controls are locaated on the
front. Adjust the Green Focus VR for best focus of
overall picture. (Fig. 2)
The electrical focus controls are locaated on the
front. Adjust the Green Focus VR for best focus of
overall picture. (Fig. 2)
2. Repeat for Red focus VR while projecting Red
only.
3. Repeat for Blue. (Best focus at bottom left corner
of screen)
Focus - Optical Lens ADjustment
Note: This adjustment nomally should not require
resetting unless the lens has been replaced or
adjustment has changed.
adjustment has changed.
1. Optical focus adjustment is located on the top of
each CRT lens system. Loosen the adjustment
knurles locking knob. (Fig. 4)
knurles 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
screencenter area.
screencenter area.
5. Do the same for the Red focus lens while project-
ing Red only.
6. Repeat for Blue.
Adhesive
Fig. 1
+
+
+
+
+
+
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
locking knobs
B
G
R
Optical lens focus adjustment
Fig. 4
(Rear view)
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