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Under Voltage Detection
Figure 4
If the 15-volt supply drops below 11.2 volts, transistor 7221 will turn Off. The 5-volt standby supply will
be applied to the base of 7220 via resistors 3262 and 3263. This will cause the +15UV line to go High.
In the Standby mode, the Standby line is High turning transistor 7222 On. When the set is turned On,
7222 turns Off. Capacitor 2296 provides a delay to prevent the +15UV line from going High before the
+15V supply turns On.
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