ⓐ Understanding and Constitution of HRS Correction
▶ What is HRS (Horizontal Raster Shift) circuit?
- When electron BEAM emanates from CRT, it must form the image evenly on the center of a screen. However, the left-right
linearity can be awry due to the micro-distortion of horizontal angle while producing CRT. HRS is a compensatory circuit
which crosses DC voltage over CS condenser on horizontal output board to correct the distortion.
ⓑ HRS Circuit Operation and Picture Movement
▶ Operational Principle.
- HRS circuit consists of R407, D415, D407, SW401, C415, L404. If switch SW401
(Service S/W) to the direction of R407, it raises the C426 CS condenser voltage through D415 and the picture moves to
right. If switch SW401 to the direction of D417, the picture moves to left.
C415 is functioning as a condenser which stops generating current. It can control the left-right movement since the
rechargeable voltage varies as the condenser capacity value varies.
That is, the larger the C415 capacity value becomes, the bigger the left-right movement will be.
▶ Picture Movement during 0HRS Connection
* Direction of SW407 Switch .... Center : Not corrected.
.... D415 : moves to the right of a picture
.... D417 : moves to the left of a picture
Condition
Total Length of a Picture Moved (m/m)
Left Center Right
To Left To Right To Left To Right To Left To Right
After 5.5 6.5 1.5 2 6.5 6
To Next Page
Loading...
