Colour Purity; Convergence - Panasonic TX-34P180R Service Manual

TX-34P180R
5.7.

COLOUR PURITY

1. Operate the TV set for 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 63 DAC.
5. Adjust roughly the static convergence magnets.
6. Fully degauss the picture
degaussing coil.
7. Loosen a clamp screw for 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 the center of the screen.
9. Slowly press the deflection yoke and set it where a uniform
green field is obtained.
10. Adjust roughly the Low Light controls and make sure that a
uniform white field is obtained.
11. Tighten the clamp screw.
5.8.

CONVERGENCE

1. INSTRUMENT
a. Helmhortz device
2. PREPARATION
a. Set the Helmhortz device to local magnetic field.
Horizontal: 0 ± 0.03 x10
b. Receive the cross hatch pattern.
c. Picture menu: DYNAMIC Normal and adjust BRIGHT
DAC until gray portion of cross hatch.
tube using an external
-4
T
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.
c. After adjustment, secure magnets with magnet lock
of white lacquer.
*Beams move with rotating when static magnets are
turned.
Rotational reduce of beams differs by angle of two
magnets.
Therefore, repeat magnet adjustmentsseveral times
so that all are aligned completely.
b. YHC, YV, XV, Adjustment (Fig. 2)
a. Adjust so that Static and Dynamic convergence is
best with YHC, VR, YV and XV coil.
In case of static convergence is tilted, repeat (1)
Static convergence Adjustment.
c. Dynamic convergence Adjustment
a. When dynamic convergence is bad, fixing permalloy
between neck and DY so that dynamic convergence
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 side line to straight.
14
Fig. 1
Fig. 2