X-Ray Protection; Earth Safety Connexion - Hantarex POLO 10" Manual De Servicio

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 1
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. 34077 420
- 1 threaded earth fixing post code no. 40114007
- 1 shake proof washer 4.3 x
of the line output transformer rises to such a value that it brings transistor T107 into
O
X RAY PROTECTION
PIN 4
x 0.5 code no. 42000540
8
TH103
CIRCUIT
+12V
10
-200
Vpp
R236
1R
0144
BYD
33G
C181
250V