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While the Automatic Beam Limiter is designed to start
its operation at approximately 0.5
rnA,
it is adjustable
up to 0. 7
rnA
by VR601.
Safety Circuit I is designed to
protect against beam limiter failure.
·Photo Coupler,
PC507 is provided to detect excessive current flow into
the high voltage transformer, T591.
When the beam
current increases, the voltage across R328 causes PC507
to conduct, and triggers SCR, TH301.
HV AND SAFETY CIRCUIT
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Safety Circuit is provided to prevent occasional
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increase of the high voltage that may cause radia-
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tion of harmful level.
No modification shall be
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applied on the high voltage and safety circuit.
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3.5.7
G 2 and Focus Voltage
Screen grid bias voltage and focus voltage are obtained
from high voltage and formed by potentiometers VR591
and HV resistor.
The HV resistor and focus resistor combination is a
potted assembly located
on
the deflection assembly.
3-17
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