Panasonic TX-47PT1F (serv.man2) Service Manual ▷ View online
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TX-47PT1F
Service Hints
Service position for Main chassis
1. Remove the Bottom Rear Cover by removing (11)
screws around its perimeter.
2. Remove lead wires and bundles from holders as
necessary.
3. Pull out main chassis and stand it.
Service Position for D/F/W/G/F2/
K-Board
1. Remove the each circuit board from A or E-Board.
2. Connect extension cables between individual cir-
2. Connect extension cables between individual cir-
cuit board and A or E-Board.
Note: Extension cable kit is supplied as service fix-
tures and tools. ( Part No. TZS709010 )
Service Position for CP, DC-Board
1. Remove the Bottom Rear Cover by removing (11)
screws around its perimeter.
2. Remove the Right Bottom Cover secured with (7)
screws around its perimeter.
3. Remove (2) screws secured the CP and DC
Board.
4. Pull out the CP and DC Board.
Service Position for P-Board
1. Remove the Bottom Rear Cover by removing (11)
screws around its perimeter.
2. Remove the Left Bottom Cover secured with (7)
screws around its perimeter.
3. Remove (2) screws secured the P Board.
4. Pull out the P Board.
4. Pull out the P Board.
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TX-47PT1F
Service Position for M/K2/RM-Boards
1. Remove the Top Cabinet Ass’y.
2. Remove M-Board by removing (3) screws.
3. Remove K2-Board by removing (2) screws.
4. Remove RM-Board by removing a screw.
2. Remove M-Board by removing (3) screws.
3. Remove K2-Board by removing (2) screws.
4. Remove RM-Board by removing a screw.
Disassembly For CRT Removal
To facilitate CRT replacement, the complete CRT
mounting chassis does not need to be removed.
1. Remove the Screen Frame Ass’y, Decorative
mounting chassis does not need to be removed.
1. Remove the Screen Frame Ass’y, Decorative
Panel and the Bottom Rear Cover Ass’y. ( See Dis-
assemble for Service ).
assemble for Service ).
2. From the Rear side, remove the defective CRT’s
anobe lead from the Flyback Transformer block
that is mounted secured to the Main chassis E-
Board.
that is mounted secured to the Main chassis E-
Board.
3. Grasp the anode lead protective cap body inside,
and rotate 1/4 turn counter clockwise and pull
anode lead sleeve out of the distributor.
anode lead sleeve out of the distributor.
4. Discharge anode lead to CRT chassis metal
frame.
5. Unplug the defective CRT Dag ( GND ), from the
CRT Board, LBGND for LB, LGGND for LG,
LRGND for LR.
LRGND for LR.
6. Remove lead wires ( DY, VM coil ) and anode lead
wire from holders as necessary.
7. Remove the CRT Board from the defective CRT
neck.
8. Loosen a screw that secured the VM Coil and
remove SR/SG/SB Board from CRT neck.
9. Note position of yoke with centering tabs and
remove from defective CRT.
10. Remove (4) screws from the defective CRT hous-
ing.
CAUION: Do not remove the 4 CRT lens screws.
CAUION: Do not remove the 4 CRT lens screws.
11. From the Rear side of the optical block, remove (2)
screws from the defective CRT.
12. From the Top, remove (2) screws from the defec-
tive CRT.
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TX-47PT1F
13. Release CRT anode lead from CRT chassis wire
clamp and all other wires from holders.
14. Wire the anobe lead wire.
15. Lift out CRT assembly with lens assembly and
other CRT neck asseblies.
16. Lay CRT face down on a soft cloth.
17. Remove CRT lens by removing (4) screws.
17. Remove CRT lens by removing (4) screws.
18. Install yoke and VM coil with other CRT neck
assemblies on CRT neck in the same order and
position as removed from the defective CRT.
position as removed from the defective CRT.
19. Push yoke against bell of CRT and tighten the
clamp just snug enough so it will not easily shift.
20. Assemble CRT focus lens assembly to new CRT
with (4) screws. Make sure focus lens adjustment
nut is in the same location as on other CRT focus
lens.
nut is in the same location as on other CRT focus
lens.
Note: Please assemble with screws in the order
shown in detail and tighten with same torque.
1
4
3
2
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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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