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3-6
When PON-1 goes High, Q9A21 turns Off, allowing
Q9A20 to turn On. With Q9A20 conducting, the 12V
supply is generated from the 12VS supply. The 12V
supply enables IC9A22 and the 5V-1 supply is gener-
ated.
Time Shift Supply Power Distribution
Figure 3-8 illustrates the Power Distribution for the Time
Shift supplies. The 5V-1 supply is used by the MLink,
3DYC and Signal Select circuitry. It is also the source
for the 3.3V-2 supply, which is directed to the Conver-