Philips PM 3266 - 3.3.7. Removing the cathode ray tube (CRT)

143
3.3.7.
Removing
the
cathode ray
tube
(CRT)
Attention:
Be very
careful
with
the side
connections
of
the
CRT. If
these
pins
are
bent, the
CRT is
likely
to
develop
a
gas leak.
—
Remove
the top
cover,
bottom
cover,
black
metal screening
plate
and the
rear
plate.
—
Carefully
remove
the CRT
side
connections.
—
Unplug the stocko plug
that connects
the CRT
storage
electrodes
with
the
storage
amplifier
unit.
—
Disconnect
the trace
rotation
wires on the
final
X-amplifier.
—
Disconnect
the
EHT
cable and
discharge
it.
-
Remove
the
tube base.
—
Remove the
screen
bezel
by pulling
the lower edge.
—
Remove
the final
X-amplifier
as described
in section 3. 3. 6.
3.
—
Remove
the final
Y-amplifier
as described
in section
3.3.6. 5.
—
Slacken the
two screws
that secure the
upper CRT
screen support to
the
front
panel and disconnect
the
earth
connection for
the CRT shield.
—
Slacken
the brace round
the CRT neck.
—
Remove
the.two screws that
connect
the rubber CRT holder
to the rear
panel.
—
Carefully
slide the screen
side of
the CRT into the shield
—
Now there is enough space to take
the
CRT, shield and rubber
socket
upwards out of the instrument.
—
Now
the CRT,
shield and socket can be
separed.
Attention: If
the rubber socket
round the CRT neck must be slid
over the neck
of a replacement tube,
the use
of industrial talcum
powder is strongly recommended
to prevent the rubber
socket from sticking
on
the CRT neck.