Service manual

Page 19
MD 1772LB (B1770NSL/T)
MEDION
Figure 4-1. Convergence Magnets on the CRT
+
8 7 6 5 4 3 2
10
1
11
CRT
FRONT
P
9
1) Setup Bolt 2) Bow Ma
g
net 3) Band 4) 2-Pole Ma
g
net
5) Spacer 7) Spacer
9) Holder
6) 4-Pole Ma
g
net
8) 6-Pole Ma
g
net
11) Tabs10) Band
3. Rotate the individual rings of 4-pole convergence magnets by changing the spacing between the 2 tabs to
converge the vertical red and blue lines at the center of the screen.
4. Rotate the pair of rings of 4-pole convergence magnets by maintaining spacing between the 2 tabs to
converge the horizontal red and blue lines at the center of the screen.
5. Rotate the individual rings of 6-pole convergence magnets by changing the spacing between the 2 tabs to
converge the vertical red, blue and green lines.
6. Rotate the pair of rings of 6-pole convergence magnets by maintaining spacing between the 2 tabs to
converge the horizontal red, blue and green lines.
7. Repeat the steps from 3~6 until the best convergence is obtained.
Note : The 4-pole magnets and the 6-pole magnets interact, making dot movement complex.
Blue Red
Blue
Red
Red/
Blue Green
Red/
Blue
Green
4-pole magnets
movement
6-pole magnets
movement
Figure 4-2. 4-pole and 6-pole Magnets Movement