Samsung WS-32M204D, Руководство по обслуживанию

Страница: 120 / 127

Circuit Description
Samsung Electronics 13-3
13-2 Partial Block Description
13-2-1 Vertical & Vertical Correction Circuit
V 1
V 2
ⓐ
Understanding of Vertical Circuit and Operation Principle.
▶
What is a Vertical correction circuit?
- If the bias angle of a picture widens, the distance from the center of a picture to each corner becomes farther as it moves to
periphery. This causes the picture being distorted (Picture Lowering) vertically in a shape of a spool because of the strong
bias at four corners which are the farthest from the center.
Correction effect to the amount of a correction signal can be made by crossing Parabolic current of a vertical period over the
vertical bias current and applying it.
▶
Vertical Circuit Constitution and Operation Principle.
- Consists of L304, C305, C439, R312. Symmetrize the up and down amplitude using the saturable reactor of L304 and adjust
Vertical Gain by controlling the capacity value of C305 and C439
If the correction vector is excessive, one can slightly reduce the resistance of R312