Purity And Convergence Procedure; When The Crt Or The Yoke Is Replaced - Panasonic CT-32SX31CE Service Manual

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).
Place the vertical raster shift tabs at 3 o'clock (90
the purity and convergence tabs)
R&B Convergence Rings
R&B&G Convergence Rings
G3
Vertical Raster Shift Ring
Figure 9.
Positioning of Purity/Convergence
Assembly (4 Pairs of Rings)
R&B&G Convergence Rings
R&B Convergence Rings
Vertical Raster
Shift Rings
Purity Rings
Figure 10.
Positioning of Purity/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.
o from
Purity Rings Centered
Over G3/G4 Gap
G4
o
90
- 13 -
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. 9
and Fig. 10) 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. 11)
Center line
from pattern
Mechanical
Center Marks
Figure 11.
Vertical Raster Shift Adjustment
(4 pairs of rings assembly)
(Only for
Open the
same angle
from center
Vertical Raster Shift tabs