7. X-RAY Protection Circuit
The X-Ray protection circuit senses the CRT's high voltage or beam current and stops the horizontal oscillator if
excessive voltage or current exists. The circuit operates if the high voltage exceeds specifications by about 20%.
R541
C52'l
.......
t:ln
of
c:..
v
_0
AV
O
..
_f.,.,.,.,. .. :
__
f":.-_
•• :
...
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~
__________________________
'_'_'~_._'_'V
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A_-'_'~
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__________
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______________
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The
Pin
3 Winding of the flyback transformer supplies current to the protection circuit. 0510 rectifies the current
before
it
is
applied to the R539. This DC current is divided by R539
and
R541. Incase of normal operation, the
voltage
V1
is lower than the 0508's breakdown voltage. When the high voltage exceeds specifications by about
20%, voltage
V1
exceeds 0508's breakdown voltage.
If for any reason the horizontal oscillation output is stopped and the shut down circuit functions, turn off the power
and turn it
on
again after about 10 seconds later.
32
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