Panasonic CT-25G6UE Servicehandleiding - Pagina 11
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Purity and Convergence Procedure
Adjustment is necessary only if the CRT or the
deflection yoke is replaced or if the setting was
disturbed. The complete procedure consists of:
1. Vertical Raster Shift Adjustment. (Only for Models
with Purity/Convergence Assembly with 4 Pairs of
Rings).
2. Initial static convergence.
3. Setting the purity.
4. Final static convergence.
When the CRT or the Yoke is Replaced
Place the yoke on the CRT neck (do not tighten
the clamp).
For a 2-piece assembly
Position purity/convergence assembly as shown and
tighten clamp snugly. Remove the hot-melt glue seal
on assembly and position like tabs of purity device
together at 12 o'clock to reduce its magnetic field
effect.
Figure 5.
Positioning of Purity/Convergence Assembly
(2-piece assembly)
For models using 4 pairs of rings, place the vertical
raster shift tabs at 3 o'clock (90
convergence tabs, see Fig. 6 and Fig. 7) .
Figure 6. Positioning of Purity/Convergence
Assembly (4 Pairs of Rings)
Figure 7. Positioning of Purity/Convergence
Assembly (4 Pairs of Rings)
For a 1-piece assembly
Position like tabs of purity devices together at 12
o'clock to reduce any magnetic field effect. (For better
:
(see Fig. 5)
o
from the purity and
:
(see Fig. 8)
- 11 -
results, note part number and look for specifications at
Service Center)
Figure 8. Positioning of Purity/Convergence
Assembly (1-piece assembly)
For either assemblies:
Turn the Receiver ON. Operate the Receiver for 60
minutes using the first Purity Check field (white screen)
to stabilize the CRT.
Fully degauss the Receiver by using an external
degaussing coil.
Slide the deflection yoke back and forth on the neck of
the CRT until it produces a near white, uniform raster.
Vertical Raster Shift Adjustment
Models with Purity/Convergence Assembly with 4 Pairs
of Rings).
Apply a green pattern with a horizontal line, adjust the
Deflection Yoke so that has no tilt, then secure it.
Adjust center line of the pattern with the mechanical
center of the CRT, this center is determined by two
marks at the side edges of the screen. To adjust the
line, once the vertical raster shift tabs are place at 3
o'clock to reduce its magnetic field effect (see Fig. 6
and Fig. 7) open the tabs the same angle from the
center, until the center line of the pattern becomes a
straight line, centered with the marks of the CRT. (see
Fig. 9.)
Figure 9. Vertical Raster Shift Adjustment
(4 pairs of rings assembly)
Initial Center Static Convergence
Connect a dot/cross hatch generator to the Receiver
and tune in a signal. Observe misconvergence at
center of the screen only.
Adjust the R & B pole magnets; by separating tabs and
rotating to converge blue with red.
Adjust the R & B and R & B & G pole magnets: by
separating tabs and rotating to converge blue and red
(magenta) with green.
Note: Precise
convergence
not important.
(Only for
at
this
point
is