Advertisement
3. PURITY AND CONVERGENCE
ADJUSTMENTS
NOTE
1. Turn the unit on and let it warm up for at least 30 minutes before
performing the following adjustments.
2. Place the CRT surface facing east or west to reduce the
terrestrial magnetism.
3. Turn ON the unit and demagnetize with a Degauss Coil.
3-1: STATIC CONVERGENCE (ROUGH ADJUSTMENT)
1. Tighten the screw for the magnet. Refer to the adjusted CRT for
the position. (Refer to Fig. 3-1)
If the deflection yoke and magnet are in one body, untighten the
screw for the body.
2. Receive the green raster pattern from the color bar generator.
3. Slide the deflection yoke until it touches the funnel side of the
CRT.
4. Adjust center of screen to green, with red and blue on the sides,
using the pair of purity magnets.
5. Switch the color bar generator from the green raster pattern to
the crosshatch pattern.
6. Combine red and blue of the 3 color crosshatch pattern on the
center of the screen by adjusting the pair of 4 pole magnets.
7. Combine red/blue (magenta) and green by adjusting the pair of 6
pole magnets.
8. Adjust the crosshatch pattern to change to white by repeating
steps 6 and 7.
3-2: PURITY
NOTE
Adjust after performing adjustments in section 3-1.
1. Receive the green raster pattern from color bar generator.
2. Adjust the pair of purity magnets to center the color on the
screen.
Adjust the pair of purity magnets so the color at the ends are
equally wide.
3. Move the deflection yoke backward (to neck side) slowly, and
stop it at the position when the whole screen is green.
4. Confirm red and blue colors.
5. Adjust the slant of the deflection yoke while watching the screen,
then tighten the fixing screw.
Fig. 3-1
DEFLECTION YOKE
DEFLECTION YOKE SCREW
MAGNET SCREW
6 POLE MAGNETS
4 POLE MAGNETS
PURITY MAGNETS
No. 52133
3-3: STATIC CONVERGENCE
NOTE
Adjust after performing adjustments in section 3-2.
1. Receive the crosshatch pattern from the color bar generator.
2. Combine red and blue of the 3 color crosshatch pattern on the
center of the screen by adjusting the pair of 4 pole magnets.
3. Combine red/blue (magenta) and green by adjusting the pair of 6
pole magnets.
3-4: DYNAMIC CONVERGENCE
NOTE
Adjust after performing adjustments in section 3-3.
1. Adjust the differences around the screen by moving the deflec-
tion yoke upward/downward and right/left.
(Refer to Fig. 3-2-a)
2. Insert three wedges between the deflection yoke and CRT funnel
to fix the deflection yoke.
(Refer to Fig. 3-2-b)
R G B
R
G
B
UPWARD/DOWNWARD SLANT
Fig. 3-2-a
WEDGE
WEDGE
WEDGE POSITION
Fig. 3-2-b
AV-20FD24
R G B
R
G
B
RIGHT/LEFT SLANT
WEDGE
23
Advertisement
