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3-1
Chapter 3
Power Supply
From the above diagram, it is apparent that the V23
Chassis has four Power Supply Operational Modes.
1) Low Energy Mode
2) Standard Standby Supply Mode.
3) Time Shift Recording Mode.
4) Conventional PTV On Mode.
Low Energy Mode
When the Low Energy Mode is activated the TV uses
less than 3 Watts while the set is Off. The Low Power
Standby Supply generates a 9VS supply. Three addi-
tional supplies are derived from the 9VS supply, 5VS,
3.3V-ES and 3.3VS-1.
These supplies furnish power for the PTV Control Cir-
cuitry. This is the only circuitry active in the Low En-
ergy Mode when the PTV is Off.
In the Low Energy Mode the set is booted up each time
the TV is switched On. When switched On, the LED
will flash for approximately one minute before the TV
powers On.
Low Energy Mode Activation
The Low Energy Mode is activated from the user's On-
screen Menus. To activate the Low Energy Mode:
1) Press "MENU".
2) Select the Setup Menu (Shown in Figure 3-1).
3) Use the Remote Direction Keys to activate, or
deactivate the Low Energy Mode.
Low Energy Standby Regulator
Figure 3-2 illustrates the Low Energy Mode Regulator
Circuitry. IC9A10 is the same is the same type of regu-
lator used in the V20.