Convergence Adjustment - Sylvania 6720FDF Service Manual

16. Convergence Adjustment

Purpose: To obtain proper convergence of red, green
and blue beams.
Symptom of Misadjustment: If Convergence
Adjustment 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
Figure
CRT
COIL
DY WEDGE
DEFLECTION YOKE
C.P. MAGNET (RB)
R
G
B
C.B. MAGNET (RB-G)
RB
G
1. Set the unit to the AUX mode which is located
before CH2 then input a dot or crosshatch pattern.
2. Loosen the Ring Lock and align red with blue dots
or crosshatch at the center of the screen by
rotating (RB) C.P. Magnets. (See Fig. 10.)
3. Align red / blue with green dots at the center of the
screen by rotating (RB-G) C.P. Magnet.
(See Fig. 11.)
Mode Input
Dot Pattern
--- or
Crosshatch
Spec.
See below
PURITY RB RB-G
SCREW
RING LOCK
SCREW
C.P. MAGNET CLAMPER
C.P. MAGNET
COIL CLAMPER
Fig. 9
R
G
B
Fig. 10
G
RB
Fig. 11
4. Fix the C.P. Magnets by tightening the Ring Lock.
5. Remove the DY Wedges and slightly tilt the
Deflection Yoke horizontally and vertically to
obtain the best overall convergence.
6. Fix the Deflection Yoke by carefully inserting the
DY Wedges between CRT and Deflection Yoke.
1-7-9 T1100EA