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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 (see Fig. 23):
Position purity/convergence assembly as shown and
tighten clamp snugly. To reduce its magnetic field
effect, remove the hot-melt glue seal on assembly and
position like tabs of purity device together at 12 o'clock.
Figure 23.
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. 24 and Fig. 25.)
Figure 24. Positioning of Purity/Convergence
Assembly (4 Pairs of Rings)
Figure 25. Positioning of Purity/Convergence
Assembly (4 Pairs of Rings)
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Purity and Convergence Procedure
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from the purity and
For a 1-piece assembly (see Fig. 26):
Position like tabs of purity devices together at 12
o'clock to reduce any magnetic field effect. (For better
results, note part number and look for specifications at
Service Center)
Figure 26. 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, and then secure it.
Adjust centerline 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. 24
and Fig. 25) open the tabs the same angle from the
center, until the centerline of the pattern becomes a
straight line, centered with the marks of the CRT. (See
Fig. 27)
Figure 27. Vertical Raster Shift Adjustment
(4 pairs of rings assembly)
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