Pin Keystone, Bow And Geometric Corrections - Sony CPD-420GS Training Manual

65
Pin, Keystone, Bow and Geometric Corrections
The DSP IC1002 (N Board) pin 64 (E/W) output is also used for Pin,
Keystone, Bow and Geometric corrections. IC1002 alters the parabola
waveform (H.SHAPE) that is input to IC805/2. IC805/20 outputs the nec-
essary PWM drive to Q506 H SIZE REG OUT to control the amount of B+
that is applied to Q505 H OUT. By adjusting the amount of B+, the circuit
can correct for Pin, Keystone and Bow.
IC805/20 PWM
IC805/2 H. SHAPE