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Horizontal and Vertical Sync is fed to 7600 on Pins 23 and 24. IC 7600 processes the sync to provide
the geometry for the picture. Horizontal drive is output to the sweep circuit on Pin 8. Vertical drive is
output on Pins 1 and 2. East West drive is output on Pin 3. Sandcastle (SCO) is output on Pin 9.
Horizontal Feedback (HFB) from the sweep circuit is fed into the Phase Loop to phase correct the
Horizontal drive.
IC 7600 is controlled by the Microprocessor via the I2C buss on Pins 10 and 11. Geometry and Drive
settings are stored in the Memory IC located on the HOP panel.
HOP Sharpness Control
Figure 23
The Sharpness controls for the YUV/RGB signals are located on the HOP panel. Since all three
circuits are basically the same, only the Blue one will be discussed.
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