Service manual

Page 16 Alignments and Adjustments
MD 1998LE (B1997PNST)
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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
Figure 4-1. Convergence Magnets on the CRT
4-2-3 Focus Adjustment
CONDITION
Display image : “e” character pattern
PROCEDURE
1. Set Brightness and Contrast used for a normal display.
2. Adjust the static focus control on the high voltage resistor block to obtain the best focus over the entire
display area.
4-2-4 Static Convergence Adjustments
Static convergence involves alignment of the red, blue and green lines in the center area of the display.
Note : The monitor requires 30 minutes of warm-up time for convergence adjustment.
CONDITION
Display image : Crosshatch pattern
Warm-up Time : 30 minutes
PROCEDURE
1. Set Brightness and Contrast to display a well-defined pattern.
2. Ensure the convergence magnet rings are correctly positioned on the CRT.
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.