High Voltage Block - Sony TVP-08 Training Manual

High Voltage Block

Overview
The High Voltage circuit uses the H Drive signal to produce the heater,
+210, High Voltage, Focus Voltage and ABL output. This block also uses
the H Drive signal to produce a PWM signal. This signal is compared to
a voltage tapped off of the High Voltage Block to create a HV Regulation
signal. The High Voltage is regulated to keep brightness changes from
causing changes in the size of the picture.
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There are also two HV Stop circuits, one that monitors the +12, +135 and
the tap from the High Voltage Block, and another that monitors a tap from
the FBT and the ABL signal. Both of these circuits mute the H Drive
circuit and alert IC1009 OSD Processor of a failure. If there is a High
Voltage Protect problem, the set will not shut down since there is no con-
nection between the High Voltage Protect circuit and the latch circuit.