Maintenance— Type 544/RM544
H9 t * t . Crl b« i*l and ly tb ro w arrangement
Eyebrow
Retaining
Spring
Eyebrow
Polarized
Light
Filter
Crt Bezel
Nutt
Crt Viewing hole tor crt
Mounting icrew t for
crl ba te clamp bracket.
Fig. 4-3. loosening the crt bote clamp.
4. Using a Phillips screwdriver, loosen the crt base clomp
(see Fig. 4-3).
5. With your left hand, wiggle the crt socket to ensure
that the base of the crt is loose in the base clamp,
6. With a chisel-tipped plastic or wooden dowel, core-
fully work the crt socket loose from the crt base.
7. Grasp the face of the crt with the right hand. Push
the crt carefully towards the front of the Type 544
with the left hand. Be careful not to bend the neck
pins. Remove the crt through the front of the oscillo
scope.
8. Before reinstalling the crt, dust talcum powder on the
crt base. This keeps the base of the crt from sticking
to the neoprene bushing inside the base clamp.
9. Carefully insert the new tube into the shield and the
tube base clamp. Keep the anode button in line with
the anode connector hole so that the button is aligned
with the hole when the crt is fully inserted.
NOTE
Make sure that the crt base clamp is loose enough
to permit the crt base to slide through the neoprene
bushing inside the base clamp.
10. Connect the tube socket to the tube base. Check that
the socket is fully seated.
11. Align the crt so that the horizontal graticule lines are
parallel with the lop of the front ponel. Push the crt
inward until the crt face protrudes exactly Vit" beyond
the front pane!.
NOTE
If the crt face is not parallel with the front of the
oscilloscope, use a Jk* hexagonal wrench to loosen
the two mounting screws that fasten the base clamp
to its mounting brocket (see Fig. 4-3). The base
clamp and crt base may now be moved radially to
align the face of the crt parallel with the front of
the oscilloscope.
12. Reconnect the anode ond neck pin leads (observe color
code).
13. Tighten the base clamp.
14 Turn on the oscilloscope. Obtain a free-running sweep
on the crt.
15. Check the alignment of the trace with the gaticule
lines. If the trocc is not parallel with the graticule lines,
align the traces with the TRACE ROTATION control.
4
16. Replace eyebrow, eyebrow retaining spring, plastic
polarized light filter, crt bezel and bezel nuts.
Graticule Lamps
Proper illumination of the crt graticule depends upon the
proper positioning of the graticule lamps. When replacing
graticule lamps, slide the lamp and socket in or out until the
filament of the lamp is at the middle of the eyebrow
thickness.
Ceramic Terminal Strips
To remove a ceramic terminal strip, first unsolder all leads
and components connected to it. Use diagonal cutters to cut
4-3
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