Tektronix 310A, Instruction Manual, Page: 48 / 132

Maintenance-Type 310A
C. RESISTORS. Check the resistors w ith an ohmmeter
See the Electrical Parts List fo r the tolerance o f the resis­
tors used in this instrument. Resistors normally do not need
to be replaced unless the measured value varies widely from
the specified value.
D. INDUCTORS. Check fo r open inductors by check­
ing continuity w ith an ohmmeter. Shorted or partially
shorted inductors can usually be found by checking the
waveform response when high-frequency signals are passed
through the circuit. Partial shorting often reduces high-
frequency response (roll-off).
E. CAPACITORS. A leaky or shorted capacitor can
best be detected by checking resistance with an ohmmeter
on the highest scale. Do not exceed the voltage rating o f the
capacitor. The resistance reading should be high after initial
charge o f the capacitor. An open capacitor can best be
detected with a capacitance meter or by checking if the
capacitor passes AC signals.
8. Repair and Readjust the Circuit. If any defective
parts are located, fo llo w the replacement procedures given
in this section. Be sure to check the performance o f any
circuit that has been repaired or that has had any electrical
components replaced.
CO RRECTIVE M A IN TEN A N C E
General
Corrective maintenance consists of component replace­
ment and instrument repair. Special techniques required to
replace components are given here.
Obtaining Replacement Parts
Standard Parts. A ll electrical and mechanical part
replacements for the Type 310A can be obtained through
your local Tektronix Field Office o r representative. How­
ever, many of the standard electronic components can be
obtained locally in less tim e than is required to order them
from Tektronix, Inc. Before purchasing or ordering replace­
ment parts, check the parts lists fo r value, tolerance, rating
and description.
NOTE
When selecting replacement parts, it is important to
remember that the physical size and shape of a com­
ponent may affect its performance in the instrument,
particularly at high frequencies. 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 components are used in the Type
310A. These components are manufactured or selected by
Tektronix, Inc. to meet specific performance requirements,
or are manufactured fo r Tektronix, Inc. in accordance with
our specifications. These special components are indicated
in the Electrical Parts List by an asterisk preceding the part
number. Most of the mechanical parts used in this instru­
ment have been manufactured by Tektronix, Inc. Order all
special parts directly from your local Tektronix Field
Office or representative.
Ordering Parts. When ordering replacement parts from
Tektronix, Inc., include the following information:
1. Instrument type.
2. Instrument serial number.
3. A description of the part (if electrical, include circuit
number).
4. Tektronix Part Number.
Soldering Techniques
WARNING
Disconnect the instrument from the power source be­
fore soldering.
Ceramic Terminal Strips. Solder used on the ceramic
terminal strips should contain about 3% silver. Use a 4 0 -to
75-watt soldering iron w ith a 1/8-inch wide wedge-shaped
tip. Ordinary solder can be used occasionally w itho ut
damage to the ceramic terminal strips. However, if ordinary
solder is used repeatedly or if excessive heat is applied, the
solder-to-ceramic bond may be broken.
A sample roll of solder containing about 3% silver is
mounted on the rear o f the instrument. Additional solder
of the same type should be available locally, or it can be
purchased from T ektronix, Inc. In one-pound rolls; order
by Tektronix Part No. 251-0514-00.
Observe the follow ing precautions when soldering to
ceramic terminal strips.
1. Use a hot iron fo r a short time. A pply only enough
heat to make the solder flow freely. Use a heat sink to
protect heat-sensitive components.
2. Maintain a clean, properly tinned tip.
3. Avoid putting pressure on the ceramic terminal strip.
4. Do not attem pt to fill the terminal strip notch w ith
solder; use only enough solder to cover the wires adequately.
5. Clean the flu x from the terminal strip w ith a flux-
remover solvent.
Metal Terminals. When soldering metal terminals (e.g.,
switch terminals, potentiometers, etc.), ordinary 60/40
solder can be used. Use a soldering iron w ith a 40- to 75-
w att rating and a 1/8-inch wide wedge-shaped tip.
Observe the follow ing precautions when soldering metal
terminals:
1. A pply only enough heat to make the solder flow
freely. Use a heat sink to protect heat-sensitive compo­
nents.
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