Purity and convergence procedure
Adjustment is necessary only if the CRT orVetrtheical raster shift adjustment
deflection yoke is replaced or if the setting was(only for models with purity/convergence assembly
disturbed. The complete procedure consists of:
with 4 pairs of ring. s)
1. Vertical raster shift adj(Ousnlytmenft.or models
Apply a green pattern with a horizontal line, adjust the
with purity/convergence assembly with 4 pairs
deflection yoke so that has no tilt, then secure it.
of rings.)
Adjust center line of the pattern with the mechanical
2. Initial static convergence.center of the CRT, this center is determined by two
3. Setting the purity.marks at the side edges of the screen. To adjust the
4. Final static convergence.line, once the vertical raster shift tabs are place at 3
When theCRT or theyoke is replacedo?clock to reduce its magnetic field effect (see Fig. 9
and Fig. 10) open the tabs the same angle from the
Place the yoke on the CRT neck (do not tighten
center, until the center line of the pattern becomes a
the clamp).
ostraight line, centered with the marks of the CRT.
Place the vertical raster shift tabs at 3fro?omclock (90
(see Fig. 11)
the purity and convergence tabs)
R&B Convergence RingsPurity Rings Centered
R&B &G Convergence RingsOver G3/G4 GapCenter line
from pattern
Open the
same angle
from center
G3G4
Mechanical
Center Marks
Vertical raster shift tabs
Vertical Raster Shift Ring
Figure 9.Positioningofpurity/convergenceassembly
Figure 11.Verticalrastershiftadjustment
(4 pairs of rings)
(4 pairs of rings assembly)
R&B &G Convergence ringso
90
R&B Convergence rings
Vertical raster
shift rings
Purity rings
Figure 10.Positioningofpurity/convergence
assembly (4 pairs of rings)
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.
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ACEC
