CRT Removal
and
Replacement
(Serial Number Prefixes: 2403A-3001A)
This procedure should
be
performed
by
qualified personnel only. Voltages
are
present which,
if
contacted, could cause serious personal injury. Approximately
-4000
V dc is
present
on the
A1A3 High Voltage Regulator assembly even
when
the ac
line cord
is
disconnected.
The CRT can
hold
a +18 kV dc
charge
for several days
if the
post accelerator cable
is not
discharged.
Do
not
handle
the
A1V1
CRT, the A1A3
High-Voltage Regulator Assembly
or
Al Al 1
High-Voltage Multiplier until
the
following high-voltage discharge
procedure
has
been performed.
Removal Procedures
1.
Remove the ac line cord from both instrument sections.
With
the ac
power cords disconnected, voltages
can
still
be
present which,
if
contacted, could cause serious personal injury.
2.
Remove the feet ® from the rear of the instrument by removing the screws (2) shown in
Figure 1. Remove the feet (3) by removing the screws © and loosening the thumbscrews
©-
3.
Separate the instruments by holding the RF Section in place and pulling forward, toward
the front panel, on the IF-Display Section.
Figure
1. CRT
Replacement, Instrument Rear View
4.
When the instruments have been separated, remove the top cover from the IF-Display
Section by loosening the screw (6) shown in Figure 1.
A1A3
5
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