Component Replacement - Tektronix 2A61 Instruction Manual

Maintenance—Type 2A61
Obtaining Replacement Parts
Standard Parts. Al! electrical and mechanical parts
replacement for the Type 2A61 can be obtained through
your local Tektronix Field Office or representative. However,
many of the standard electronic components can be obtained
locally in less time than is required to order them from Tek-
tronix, Inc. Before purchasing or ordering replacement parts,
consult the Parts List for value, tolerance and rating.
NOTE
When selecting replacement parts, it is important
to remember that the physical size and shape of a
component may affect its performane at high fre-
quencies. All replacement parts should be direct
replacements unless it is known that a different
component will not adversely affect instrument
performance.
Special Parts. In addition to the standard electronic com-
ponents, some special parts are used in the Type 2A61.
These parts are manufactured or selected by Tektronix, Inc.
to meet specific performance requirements, or are manufac-
tured for Tektronix, Inc. in accordance with our specifications.
These special parts are indicated in the Parts List by an
asterisk preceding the part number. Most of the mechanical
parts used in this instrument have been manufactured by
Tektronix, Inc. Order all special parts directly from your
Tektronix Field Office or representative.
Ordering Parts. When ordering replacement parts from
Tektronix, include the following information:
1. Instrument Type.
2. A description of the part (if electrical, include the cir-
cuit number).
3. Tektronix Part Number.
4. Instrument Serial Number.
Soldering Techniques
WARNING
Disconnect the instrument from the power source
before soldering.
Ceramic Terminal Strips. Solder used on the ceramic
terminal strips should contain about 3% silver. Ordinary
tin-lead solder can be used occasionally without damage to
the ceramic terminal strips. Use a 40 to 75 watt soldering
iron with a Y, inch wide chisel-shaped tip. If ordinary solder
is used repeatedly, or if excessive heat is applied, the solder
to ceramic bond may be broken. Silver solder should be
available locally, or it can be purchased directly from Tek-
tronix, Inc.; order by Tektronix Part No. 251-0514-00.
Observe the following precautions when soldering ceramic
terminal strips:
1. Use a hot iron for a short time. Apply only enough heat
to make the solder flow freely.
2. Maintain a clean, properly tinned tip.
3. Avoid putting pressure on the ceramic terminal strip.
4-2
4. Do not attempt to fill the terminal strip notch with
solder; use only enough solder to cover the wires adequately.
5. Clean the flux from the terminal strip with a flux remover
solvent to maintain good enviromental characteristics.
Metal Terminals. When soldering metal terminals (e.g.,
switch terminals, potentiometers, etc), ordinary 60/40 solder
can be used. The soldering iron should have a 40 to 75 watt
rating with a Ys inch wide chisel-shaped tip.
Observe the following precautions when soldering metal
terminals:
1. Apply only enough heat to make the solder flow freely.
2. Apply only enough solder to form a solid connection.
Excess solder may impair the function of the part.
3. If a wire extends beyond the solder joint, clip off the
excess.
4. Clean the flux from the solder joint with flux remover
solvent to maintain good environmental characteristics.
Component Replacement
WARNING
Disconnect the instrument from the power source
before replacing components.
Ceramic Terminals Strip Replacement. A complete cer-
amic terminal strip assembly is shown in Fig. 4-1. Replace-
ment strips (including studs) and spacers are supplied under
separate numbers. The old spacers may be re-used if they
are not damaged.
Noth YU UU UU
Ceramic Strip
Chassis Spacer Stud Pin
Fig. 4-1, Ceramic terminal strip assembly.
To replace a ceramic terminal strip, first unsolder all con-
nections. Then the damaged strip can be pried or pulled
loose from the chassis. If the spacers come out with the
strip, remove them from the stud pins to be used for installa-
tion of the new strip.
After the damaged strip has been removed, place the
undamaged spacers in the chassis holes. Then, carefully press
the studs into the spacers until completely seated. If neces-
sary, use a soft mallet and tap lightly, directly over the stud
area of the strip.