Tektronix 5110, Instruction Manual

Page: 57 / 128

Maintenance-5110
Cathode-Ray Tube Replacement
The following procedure outlines the removal and
replacement of the cathode-ray tube. Refer to Fig. 4-7
WARNING |
Use care when handling a crt. Protective clothing
and safety glasses should be worn. Avoid striking it
on any object which might cause it to crack or
implode. When storing a crt, place it in a protective
carton or set it face down in a protected location on a
smooth surface with a soft mat under the faceplate to
protect it from scratches.
A. REMOVAL
1. Remove the bezel assembly, which is held in place
with two screws. (The bezel assembly includes a snap-in
implosion shield.)
O.arrn .ismtsly
CRT
2. Remove the crt base cover on the rear panel of the
instrument.
3. Remove the crt base socket.
4. Loosen the crt clamp. The crt and neck portion of
the shield will be removed
as a unit, and to facilitate
removal, it may be best to remove all hardware from the crt
clamp (bracket and positioning screws, and clamp­
tightening hardware).
NOTE
The red and black wires entering the crt shield are
connected to the trace-rotation coil inside the
shield. They will not hamper crt removal and need
not be unsoldered.
5. With one hand on the crt faceplate, push on the crt
base (and neck shield). Slide the crt and neck shield
forward, and pull the crt out of the instrument from the
front, then remove the neck shield.
B. REPLACEMENT
1.
Slide the neck shield onto the crt neck.
2. Make sure the soft plastic crt faceplate supports are
in place, then insert the crt into the main shield. Before the
crt is completely inserted, slidethe crt clamp overthe neck
shield.
3. With the crt fully inserted and loose in the shield,
mount the bezel assembly into place and tighten the bezel
screws.
1
Fig. 4-7. Replacing the cathode-ray tube.
21 14.14
4. Mount the crt clamp and positioning hardware,
temporarily leaving it loose.
5. Position the rear of the crt (socket end) so there is no
tilt of the faceplate in relation to the bezel assembly.
Tighten the positioning screws, then tighten the clamp
hardware.
6. Place the crt base socket onto the crt base pins.
Replace the cover.
7. Replacing the crt will require partial instrument
adjustment. Refer to the
Adjustment section of this
manual.
4-15