Vertical Df - Sony CPD-420GS Training Manual

Vertical DF

The Vertical Dynamic Focus circuit is comprised of circuit elements Q706
and Q707. IC1002 DSP (N BOARD) pin 58 (VDF1) outputs the V.DF
correction waveform and is applied to Q707, buffered and applied to Q706.
Q706 inverts and amplifies the V.DF waveform and via R909 is applied to
the Focus voltage at T901/15 FBT.
NOTE: IC703/11 (STBY) is controlled by the 'REMOTE ON/OFF' logic to
disable the outputs of IC703 in the 'Active Off' and 'Standby/Suspend'
modes.
NOTE: T901 FBT has two Focus controls that can be individually ad-
justed to perform overall Horizontal and Vertical Focus respectively.
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Q707/B V.DF
Q706/C V.DF