Horizontal Linearity - Sony CPD-420GS Training Manual

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Horizontal Linearity

The Micro IC1001/2 (N Board) outputs Horizontal Linearity control via
CN1001/28 to CN801/28 (H. LIN BAL) on the D Board. The Horizontal
Linearity circuit is comprised of L502 HLC (Horizontal Linearity Coil), T503
LCT (Linearity Coil Transformer) and Q507 HLC CTRL. Horizontal Lin-
earity can only be adjusted using the DAS Software. The H. LIN BAL
control is applied to Q507. L502 HLC and the primary of T503 LCT are in
parallel. The secondary of T503 is controlled by the conduction of Q507,
which varies the voltage across the winding. This voltage across the
secondary winding changes the inductance of the primary winding of T503.
Therefore, the Horizontal Linearity is controlled by varying the primary
inductance of T503. Horizontal Linearity is also maintained through each
of the Timing and Sync parameters of the video inputs.