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Alignment and Adjustments
3-3-8 Center Convergence Adjustment
Note: Before attempting any convergence
adjustment, make sure that the receiver has
been powered ON for at least twenty minutes.
1.
Input a crosshatch pattern from a color bar
generator.
2. Adjust the Brightness and Contrast controls
for a well defined pattern.
3. Adjust the two tabs of the 5-pole magnets.
Change the angle between the tabs, and
superimpose red and blue vertical lines in the
center area of the picture screen.
BLUE
BLUE
RED
4-Pole Magnet Movement
3-3-9 AGC Adjustment
1. Input a COLOR-BAR pattern. (CH2)
2. Set the RF input signal to 70 dBmV.
3. Use Generator for PM5518 & PM5418.
4. Set AGC (in the Factory Mode) so that the DC level of IC TDA8377
Pin 53 is 3.0±0.05V.
3-3-10 AFT (VCO Adjustment)
1. Input an AGC adjustment signal.
2. Select Factory Mode VCO and press the MUTE key one time.
3. GEOMATRIX adjustments
VS
EWA
VA
EWP
VSL
EWC
HS
EWT
3-8
RED
Fig. 3-3 Center Convergence Adjustment
4. Next, turn both tabs at the same time. Keep
the angle between the tabs constant, and
superimpose the red and blue horizontal lines
at the center of the screen.
5. Adjust the two tabs of the 6-pole magnets.
Superimpose the red/blue lines on the green.
Adjusting the angle affects the horizontal
lines.
6. Repeat adjustments 3, 4 and 5. The dot
movement is complex because the 4-pole and
6-pole magnets interact.
RED/BLUE
RED/BLUE
GREEN
6-Pole Magnet Movement
GREEN
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