Daewoo DTQ-14N2FC Service Manual page 12

10-2. CONVERGENCE ADJUSTMENTS
NOTE
: Before attempting any purity adjustments, the
receiver should be operated for at least 15
minutes.
A. CENTER CONVERGENCE ADJUSTMENT
1) Receive crosshatch pattern with a crosshatch signal
generator.
2) Adjust the BRIGHTNESS and CONTRAST Controls for
a good picture.
3) Adjust two tabs of the 4-Pole Magnets to change the
angle between them (See Fig. 3) and superimpose red
and blue vertical lines in the center area of the picture
screen. (See Fig. 4)
4) Turn both tabs at the same time keeping their angles
constant to superimpose red and blue horizontal lines
at the center of the screen. (See Fig. 4)
5) Adjust two tabs of 6-Pole Magnets to superimpose
red/blue line with green on top of each other. Adjusting
the angle affects the vertical lines and rotating both
magnets affects the horizontal lines.
6) Repeat adjustments 3), 4), 5) keeping in mind red,
green and blue movement, because 4-Pole Magnets
and 6-Pole Magnets interact and make dot movement
complex.
PURITY
MAGNETS
CONVERGENCE MAGNET ASSEMBLY
BLUE RED
BLUE
RED
4-Pole Magnets Movement
Center Convergence by Convergence Magnets
4-POLE
MAGNETS
4DJUST THE
ANGLE
(VERTICAL
LINES)
RED/BLUE GRN
RED/BLUE
GRN
6-Pole Magnets Movement Incline the Yoke up(or down) Incline the Yoke right(or left)
Fig. 4 Dot Movement Pattern
B. CIRCUMFERENCE CONVERGENCE ADJUSTMENT
NOTE : This adjustment requires Rubber Wedge Kit.
1) Loosen the clamping screw on deflection yoke to allow
the yoke to tilt.
2) Place a wedge as shown in figure 2 temporarily. (Do
not remove cover paper on adhesive part of the
wedge.)
3) Tilt front of the deflection yoke up or down to obtain
better convergence in circumference. (See Fig. 4) Push
the mounting wedge into the space between picture
and the yoke to hold the yoke temporarily.
4) Place other wedge into bottom space and remove the
cover paper to stick.
5) Tilt front of the yoke right or left to obtain better
convergence in cicumference. (See Fig. 4)
6) Hold the yoke position and put another wedge in either
upper space. Remove cover paper and stick the wedge
on picture tube to hold the yoke.
7) Detach the temporarily mounted wedge and put it in
another upper space. Stick it on picture tube to fix the
yoke.
8) After placing three wedges, re-check overall
convergence. Tighten the screw firmly to hold the yoke
tightly in place.
9) Stick 3 adhesive tapes on wedges as shown in figur32.
ROTATE TWO TABS AT
THE SAME TIME
(HORIZONTAL LINES)
ADJUSTMENT OF MAGNET
Fig. 3
B G R
R
G
B
R G B
Circumference Convergence by DEF. Yoke
12
CONSTANT
B
G
B G R
R
B
G
R
B G R
R
G
B