Panasonic TX-34P300K / TX-34P300XM / TX-34P300XX Service Manual ▷ View online
5.8.
Colour Purity
1. Operate the TV set over 60 minutes.
2. Receive a purity pattern signal. (white pattern)
3. Set Bright and Contrast controls to their maximum
positions.
4. Set V-POS to 128.
5. Adjust roughly the static convergence magnets.
6. Fully degauss the picture tube by using an external
degaussing coil.
7. Loosen a clamp screwfor the deflection yoke and move the
deflection yoke as close to the purity magnet as possible.
8. Adjust the purity magnet so that a vertical green field is
obtained at center of the screen.
9. Slowly press the deflection yoke and set it where a uniform
green field is obtained.
10. Adjust roughly the LowLight controls and make sure that a
uniform white field is obtained.
11. Tighten the clamp screw.
5.9.
Convergence
1. INSTRUMENT
a. Helmhortz device
2. PREPARATION
a. Set the Helmhortz device to local magnetic field.
Hrizontal : 0 ± 0.03 × 10-4 T
b. Received the cross hatch pattern.
c. Picture menu : DYNAMIC Normal and adjust BRIGHT
DAC until gray portion of cross hatch.
d. Set DY to CRT not to tilt (up and down and left and
right).
3. ADJUSTMENT
a. Static convergence Adjustment
a. Make sure that magnets are positioned shown in
Fig. 1.
b. Adjust 4-pole magnets (Fig. 1.) to align center dots
of R and B and adjust 6-pole magnets to align center
dots to G.
dots to G.
c. After adjustment, secure magnets with magnet lock
of white lacquer.
*Beams move with rotating when static magnets
are turned.
are turned.
Rotational reduce of beams differs by angle of
two magnets.
two magnets.
Therefore, repeat magnet adjustments several
time so that all aligned completely.
time so that all aligned completely.
Fig. 1.
b. YHC, YV, XV, Adjustment (Fig. 2.)
a. Adjust that Static and Dynamic convergence is best
with YHC VR, YV VR and XV coil.
In case of static convergence is tilted, repeat (1)
Static converegnce Adjustment.
Static converegnce Adjustment.
Fig. 2.
c. Dynamic convergence Adjustment
a. When dynamic convergence is bad, fixing permalloy
between neck and DY so that dynamic convergence
is best.
is best.
4. Confirm that left upper side line is straight.
When left upper side line isn’t straight, put magnet on DY
and adjust the left upper scide line to straight.
and adjust the left upper scide line to straight.
17
TX-34P300K / TX-34P300XM / TX-34P300XX
Preparation
1. Receive a colour bar signal with colour “OFF”, and operate
the TV set more than 15 minutes.
2. Set the picture menu to “DYNAMIC NORMAL” and the AI to
off.
3. Connect an oscilloscope to TPL7 with DC mode.
4. Set the TV set to Service Mode 1 .
5. Screen VR : Min
6. Set the data level of SUB BRIGHT, R, G, B-CUTOFF and
R, G, B-DRIVE to the table values.
Display
Date Level
R High (R-CUT OFF)
128
G High (G-CUT OFF)
128
B High (B-CUT OFF)
128
R Low(R-DRIVE)
175
G Low(B-DRIVE)
175
B Low(G-DRIVE)
175
SUB BRIGHT
128
Adjustment
1. Select G-CUTOFF adjustment mode and collapse vertical
scan.
2. Adjust G-CUTOFF control to become the DC=0V to video
level at 180V as shown in.
3. Slowly turn the screen control clockwise until a green colour
horizontal line appears on the picture tube. This is the
setting point for the screen control.
setting point for the screen control.
Note that do not adjust the G-CUTOFF setting in the
following procedure.
following procedure.
4. Adjust the remained R and B-CUTOFF controls so as to get
a white horizontal line on the screen.
5. Return to full field SCAN by pushing the position 5 key on
the remote control.
6. Adjust the R-Drive and B-Drive controls as to obatain
uniform white on the white bar of the greyscale pattern.
7. Confirm correct B/W rendition and greyscale tracking or
repeat CUTOFF and drive control set up.
Note:
White down the original value for each address
adjustment before adjusting anything.
adjustment before adjusting anything.
8. Wedge A shown in Fig. 1 should be fixed within a range of
45° to the left of the vertical line as shown.
9. After inserting wedge A, insert wedges B, C and D.
The wedges should be set 90° apart from each other.
10. Be certain that the four wedges are firmly fixed and the
Deflection Yoke is tightly clamped in place. Otherwise the
Deflection Yoke may shift its position and cause a loss of
convergence and purity.
Deflection Yoke may shift its position and cause a loss of
convergence and purity.
5.10. CUT OFF
18
TX-34P300K / TX-34P300XM / TX-34P300XX
5.11. White Balance
Item/Preparation
Adjustment Procedure
1. Select Service Mode 1.
2. Aging should have been performed over 30 minutes.
3. Receive the white balance pattern.
4. Picture menu : DYNAMIC NORMAL.
AI : OFF
5. Degauss the CRT face.
6. Connect the photo sensors of the Colour Analyser to the CRT.
Note:
CRT cut off adjustment is completed.
1. Adjustment of LowLight.
a. Adjustment SUB BRIGHT, so that “Y“ axis indicates 6.5.
b. Adjustment R-CUT OFF, so that y axis indicates 0.293.
c. Adjustment B-CUT OFF, so that x axis indicates 0.273.
2. Adjustment of High Light.
a. Adjust SUB BRIGHT, so that “Y“ axis indicates 150.
b. Adjust R-DRIVE, so that y axis indicates 0.277.
c. Adjust B-DRIVE, so that x axis indicates 0.271.
5.12. Foucus
Item/Preparation
Adjustment Procedure
1. Receive a cross-hatch pattern signal.
1. Adjust the Focus to thin all the Lines by Focus 1 Control.
(Prefer to thin the Vertical Lines than Horizontal Line.)
2. Adjust the Focus to thin the Horizontal Lines by Focus2 Control.
5.13. Geomagnetic
Item/Preparation
Adjustment Procedure
1. Demagnetize
the
GM-Board
around
its
perimeter
with
the
Demagnetizer.
2. Set to control;
Geomagnetic..........Auto
1. Connect a DC voltage meter to TPGM1-2pin (GM-Board)
2. Adjust the R4863 (GM-Board) so that the Vx Out at TPGM1-2pin
becomes 4.9 ± 0.05 V.
3. Connect a DC voltage meter to TPGM1-1pin (GM Board).
4. Adjust the R4861 (GM-Board) so that the Vy Out at TPGM1-1pin
becomes 4.9 ± 0.05 V.
5.14. Sub Bright
Item/Preparation
Adjustment Procedure
1. Receive the sub bright pattern.
2. Picture Menu :
BRT...................CENTER
COLOUR..........CENTER
CONT................MAX
COLOUR..........CENTER
CONT................MAX
3. Connect the photo sensor of the Colour Analyzer to the center of
CRT.
1. Adjust Sub Bright so that brightness level became 1 ± 0.2 cd/m
2
19
TX-34P300K / TX-34P300XM / TX-34P300XX
6 Deflection Adjustment
6.1.
V-ADJUSTMENT/CONFIRMATION (4:3 MODE)
6.1.1.
V-HOLD CONFIRMATION
1. Receive PAL monoscope pattern.
2. Set scan mode to 100Hz by remote control key.
3. Set aspect to 4:3.
4. Confirm that V-hold is normal.
5. Set the fix data in the table 1.
6.1.2.
V-CENTER ADJUSTMENT (4:3 MODE)
6.1.2.1.
100i V-POS ADJUSTMENT
1. Receive PAL monoscope pattern.
2. Set scan mode to 100Hz by remote control key.
3. Adjust V-POS (100i / 4:3) so that the scale of the top and bottom side is equal.
6.1.2.2.
120i V-POS ADJUSTMENT
1. Receive NTSC monoscope pattern.
2. Set scan mode to 100Hz by remote control key.
3. Adjust V-POS (120i / 4:3) so that the scale of the top and bottom side is equal.
6.1.2.3.
50p V-POS ADJUSTMENT
1. Receive PAL monoscope pattern.
2. Set scan mode to progressive by remote control key.
3. Adjust V-POS (50p / 4:3) so that the scale of the top and bottom side is equal.
6.1.2.4.
60p V-POS ADJUSTMENT
1. Receive NTSC monoscope pattern.
2. Set scan mode to progressive by remote control key.
3. Adjust V-POS (60p / 4:3) so that the scale of the top and bottom side is equal.
Fig. 1
20
TX-34P300K / TX-34P300XM / TX-34P300XX
Click on the first or last page to see other TX-34P300K / TX-34P300XM / TX-34P300XX service manuals if exist.