Raytheon NSC 18 User Manual page 15

There is absolutely no danger in handling the external controls of the radar
while the radar is in operation. In the radar's interior, however, are high
voltages which are fatally dangerous to anyone careless handling interior
components. Be absoluteley sure that the radar power switch is OFF before
performing repair work or maintenance .
Furthermore, even when the power switch is turned off, a high voltage remains
in certain parts of the radar circuits. In particular, be careful of the magnetron
heater circuit, cathode−ray tube anode circuit, etc.. Utilizing a length of wire
with one end fully grounded or an insulated srewdriver, ground all high voltage
sections to discharge the residual charges and ensure that no charges remain
before touching any part of the high voltage sections. In any case, the most
dangerous thing to do is to touch any part of the high voltage sections without
making sure that the radar power switch is off.
Exercise care when approaching a rotating antenna. Be sure to turn off the
radar power switch before performing maintenance or inspection of the
antenna. Also, make sure that nothing or no one is near the antenna when
turning on the radar power supply.
3748DOC020102
Operator Manual
HIGH VOLTAGE
ATTENTION
1−2
Edition: 14.JAN.2005