Samsung CK331EZR4X/BWT Service Manual page 32

Alignment and Adjustments
4-3-8 Center Convergence Adjustment
1. Warm up the receiver for at least 20 minutes.
2. Adjust the two tabs of the 4 pole magnets to
change the angle between them. Superimpose
the red and blue vertical lines in the center
area of the screen.
3. Adjust the Brightness and Contrast controls
for a well defined picture.
4. Adjust the two-tab pairs of the 4 pole mag-
nets, and change the angle between them.
Superimpose the red and the blue vertical
lines in the center area of the screen.
BLUE
BLUE
RED
4-Pole Magnet Movement
4-3-9 VCO Adjustment
SIGNAL
SD : ON
DETECTOR
IN BELOW
AFA
TUNER
(TDA8374)
IF (38.9MHz)
4-18
RED
Fig. 4-5 Center Convergence Adjustment
SET
VCO 63
AFB
RGB
8V
5V
2
I C-BUS
IC201
IC902
Fig. 4-6
5. Turn the both tabs at the same time, keeping
the angle constant, and superimpose the red
and blue horizontal line in the center of the
screen.
6. Adjust the two-tab pairs of the 6-pole magnets
to superimpose the red and blue line onto the
green. (Changing the angle affects the vertical
lines, and rotating both magnets affects the
horizontal lines.)
7. Repeat adjustments 2~6, if necessary.
8. Since the 4-pole magnets and 6-pole magnets
interact, the dot movement is complex
(Fig. 4-5).
RED/BLUE
RED/BLUE
GREEN
6-Pole Magnet Movement
1. Turn on the TV.
2. Set IF port of tuner to 38.9MHz.
(Use a pattern generator).
3. Input a color bar pattern (PAL-B/G system).
4. In the Factory Service Mode, select
"Adjustment → VCO" and set VCO data to
63.
5. Ensure "SD On" (Signal Input) and "SD Off"
(No Signal).
6. Adjust T201 (connected to TDA8374A pins3,4)
so that AFA Bit is "INSIDE WINDOW" (the
AFB Bit is above~below).
GREEN
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