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Idiomas disponibles
Idiomas disponibles
X-RAY PROTECTION
Polo monitors include an x-ray protection circuit, which blocks the horizontal oscillator by a change in a
reference potential generated from pulses from the e.h.t. transformer via an electronic circuit comprising T107
- T106.
If, for any reason whatsoever, the e.h.t. exceeds the value at which X-radiation reaches a level of 0.5 mR/h, the
reference voltage on pin 10 of the line output transformer rises to such a value that it brings transistor T107 into
conduction. This condition takes the voltage on pin 4 of IC TDA2593 to 6 V d.c. thus blocking the output drive
pulse appearing at pin 3, and consequently turns off the e.h.t.
The circuit continues to block the oscillator until the fault has been remedied. In any case the monitor must be
turned off and turned on again before the circuit can be reset.
EARTH SAFETY CONNEXION (Ref. A)
A
NOTE: Polo monitors are supplied with:
- . 1 input signal cable 1.5m long, code no. 61000142
- 1 3-way mains connector code no. 3407 4670
- 3 male mains input contacts code n. 34076400
- 1 earth eyelet terminal code no. 34077420
- 1 threaded earth fixing post code no. 40114007
- 1 shake proof washer 4.3 x 8 x 0.5 code no. 42000540
X RAY PROTECTION CIRCUIT
-g
PIN 4
IC1O4
� D �2 5 9 3
TH103
+12V
20103
36V
R225
R231
270K
120K
R224
47K
10
-200
Vpp
R23B
1R
D144
BYD
33G
C1B1
4u7
250V
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