Medion B1997PNST Service Manual page 19

Blue
Blue
Red
4-pole m agnets
Note : The 4-pole magnets and the 6-pole magnets interact, making dot movement complex.
4-2-5 Degaussing
Degaussing is required when poor color impurity appears on the screen. This monitor uses an automatic
degaussing circuit that is activated when the power is on. The manual degaussing will be fully functional after
the monitor has been in operation for 20 minutes through OSM degaussing function.
The degaussing effect is confined to the picture tube since the coils are mounted at the back of the tube.
Should any part of the chassis or cabinet becomes magnetized, it is necessary to degauss the affected area
with a external degaussing coil.
4-2-6 External Degaussing
1. Apply line voltage to the degaussing coil and move it in a rotary motion over the front, sides, and top of the
monitor. The coil should be kept away from the rear of the monitor to avoid damaging the magnetic neck
components.
2. Slowly rotate and move the coil away from the monitor to about 6 feet beyond the point where no effect
on the CRT will be noticeable.
For proper degaussing, it is essential that the field be gradually reduced by moving the coil slowly away from
the monitor. The degaussing coil must never be shut off or disconnected while near the monitor, as this would
introduce a strong field instead of canceling the effect of the stray fields.
Alignments and Adjustments
Figure 4-2. 4-pole and 6-pole Magnets Movement
Red
m ovem ent
MD 1998LE (B1997PNST)
Red/
Blue G reen
Red/
Blue
Green
6-pole m agnets
m ovem ent
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