Tektronix 310A, Instruction Manual, Page: 49 / 132

Maintenance-Type 31OA
No,chW F im n n j^ ^
Ceramic Strip,_____
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■Stud
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Chassis
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js
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Spacer
K
Stud Pin
Fig. 4 -1 . Ceram ic term inal strip assembly.
2. A pply only enough solder to form a solid connection.
Excess solder may impair the function of the part.
2. Carefully press the studs of the strip into the spacers
until they are completely seated. If necessary, use a soft
mallet and tap lightly, directly over the stud, to seat the
strip completely.
3. If the stud extends through the spacers, cut o ff the
excess.
4. Replace all components and connections. Observe the
soldering precautions given under Soldering Techniques in
this section.
C ath o de-R ay Tube Replacement. 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 face down on a smooth surface w ith a protective
cover or soft mat under the faceplate to protect it from
scratches.
3. If a wire extends beyond the solder jo in t, clip o ff the
excess.
4. Clean the flu x from the solder jo in t w ith a flux-
remover solvent.
The CRT shield should also be handled carefully. This
shield protects the CRT display from distortion due to
magnetic interference. If the shield is dropped or struck
sharply, it may lose its shielding ability.
Component Replacement
The following procedure outlines the removal and
replacement o f the cathode-ray tube:
WARNING
Disconnect the instrument from the power source be­
fore replacing components.
Ceram ic Terminal Strip Replacement. A complete
ceramic terminal strip assembly is shown in Fig. 4-1.
Replacement strips (including studs) and spacers are
supplied under separate part numbers. However, the old
spacers may be re-used if they are not damaged. The
applicable Tektronix Part Numbers for the ceramic strips
and spacers used in this instrument are given in the Mechan­
ical Parts List.
To replace a ceramic terminal strip, use the following
procedure:
REMOVAL:
1. Unsolder all components and connections on the
strip. To aid in replacing the strip, it may be advisable to
mark each lead or draw a sketch to show location of the
components and connections.
2. Pry or pull the damaged strip from the chassis. Be
careful not to damage the chassis.
3. If the spacers come out w ith the strip, remove them
from the stud pins for use on the new strip (spacers should
be replaced if they are damaged).
REPLACEMENT:
1. Place the spacers in the chassis holes.
A. REMOVAL:
1. Remove the side panels and separate the chassis as
described previously.
2. Remove the fo ur bezel nuts and remove the graticule
cover, light filte r and graticule.
3. Remove the CRT socket.
4. Loosen the CRT clamp at the base o f the CRT shield.
5. Place one hand on the CRT faceplate and push fo r­
ward on the CRT base w ith the other. As the CRT starts
out o f the shield, grasp it firm ly . When the CRT is free of
the clamp, slide the CRT completely out of the shield.
B. REPLACEMENT:
1. Insert the CRT into the shield.
2. Replace the CRT socket.
3. Replace the graticule, light filte r, graticule cover and
the fo ur bezel nuts.
4. Push the CRT forward against the graticule. Tighten
the base clamp.
5. Check the CRT alignment and geometry adjustments
as given in the Calibration section. Also check the basic
vertical and horizontal gain.
4 -5