Sylvania 6432TE Service Manual page 21

The following adjustments normally are not
attempted in the field. Only when replacing the
CRT then adjust as a preparation.
20. Purity Adjustment
Purpose: To obtain pure color.
Symptom of Misadjustment: If Color Purity Adjust-
ment is incorrect, large areas of color may not be
properly displayed.
Test Point Adj. Point
Deflection
--- Yoke Purity
Magnet
Tape M. EQ.
Pattern
---
Generator
Figure
GREEN RED
1. Set the unit facing east.
2. Operate the unit for over 30 minutes before adjust-
ing.
3. Fully degauss the unit using an external degauss-
ing coil.
4. Loosen the screw on the Deflection Yoke Clamper
and pull the Deflection Yoke back away from the
screen. (See Fig. 6)
5. Loosen the Ring Lock and adjust the Purity Mag-
nets so that a red field is obtained at the center of
the screen. Tighten Ring Lock. (See Fig. 5,6)
6. Slowly push the Deflection Yoke toward bell of
CRT and set it where a uniform red field is ob-
tained.
7. Tighten the clamp screw on the Deflection Yoke.
21. VRS Adjustment
1. Connect Oscilloscope and get the cross hatch pat-
tern.
2. Adjust the two magnets for VRS adjustment like
the below figure so that the cross hatch pattern be-
comes flat.
Mode Input
Red
---
Color
Spec.
See below.
BLUE
Fig. 5
5-7
22. Convergence Adjustment
Purpose: To obtain proper convergence of red, green
and blue beams.
Symptom of Misadjustment: If Convergence Adjust-
ment is incorrect, the edge of white letters may have
color edges.
Test Point Adj. Point
C.P . Magnet
(RB),
--- C.P . Magnet
(RB-G),
Deflection Yoke
Tape M. EQ.
Pattern
---
Generator
Figures
Deflection Yoke
C.P. MAGNET (RB)
R
G
B
C.B. MAGNET (RB-G)
RB
G
1. Loosen the Ring Lock and align red with blue dots
or Crosshatch at the center of the screen by rotat-
ing (RB) C.P. Magnets. (See Fig. 7)
2. Align red / blue with green dots at the center of the
screen by rotating (RB-G) C.P. Magnet. (See Fig. 8)
3. Paintlock the C.P. Magnets after adjustment.
4. Remove the DY Wedges and slightly tilt the De-
flection Yoke horizontally and vertically to obtain
the best overall convergence.
5. Fix the Deflection Yoke by carefully inserting the
DY Wedges between CRT and Deflection Yoke.
Mode Input
Dot Pattern
--- or
Crosshatch
Spec.
See below.
22mm
6-polar convergence magnet
4-polar convergence magnet
VRS magnet
Purity magnet
Fig. 6
R
G
B
Fig. 7
G
RB
Fig. 8
L2906EA