Tektronix 5441 Instruction Manual page 93

DIODES. A diode can be checked for an open or shorted
condition by measuring the resistance between terminals
with an ohmmeter scale having a low internal source cur-
rent, such as the R X l K scale. The resistance should be
very high in one direction and very low when the meter leads
are reversed.
RESISTORS. Check resistors with an ohmmeter. See
the Replaceable Electrical Parts list for the tolerance of the
resistors used in this instrument. Resistors normally do not
need to be replaced unless the measured value varies wide-
ly from that specified.
INDUCTORS. Check for open inductors by checking
continually with 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.
CAPACITORS. A leaky or shorted capacitor can usually
be detected by checking resistance with an ohmmeter on
the highest scale. Do not exceed the voltage rating of the
capacitor. The resistance reading should be high after initial
charge of the capacitor. An open capacitor can best be de-
tected with a capacitance meter or by checking that the
capacitor passes ac signals.
8. Repair and Adjustment. If any defective parts are
locatd, follow the replacement procedures given in Correc-
tive Maintenance. Be sure to check the performance of any
circuit that has been repaired or had any electrical compo-
nents replaced.
CORRECTIVE MAINTENANCE
Corrective maintenance consists of component replacement and instrument repair. Special techniques required to replace
components in this instrument are given here.
OBTAINING REPLACEMENT PARTS SOLDERING TECHNIQUES
All electrical and mechanical part replacements can be
obtained through your Tektronix Field Office or representa-
tive. However, many of the standard electronic components
can be obtained locally in less time than is required to order
them from Tektronix, Inc. Before purchasing or ordering re- To avoid electrical shock, disconnect the instrument
placement parts, check the parts list for value, tolerance,
from the power source before soldering.
rating, and description.
NOTE
When selecting replcement parts, remember that the
physical size and shape of a component may affect
the performance of the instrument, particularly at high
frequencies. All parts should be direct replacements
unless a different component will not adversely affect
instrument performance.
The reliability and accuracy of this instrument can be
maintained only if proper soldering techniques are used
when repairing-or replacing parts. General soldering tech-
niques, which apply to maintenance of any precision elec-
tronic equipment, should be used when working on this
instrument. Use only 40160 rosin-core, electronic-grade sol-
der. The choice of soldering iron is determined by the repair
to be made. When soldering on circuit boards, use a 15- to
40-watt pencil-type soldering iron with a 11Sinch wide,
wedge-shaped tb. Keep the tip properly tinned for best heat
parts are manufactured
Or
selected by Tektronixv
transfer to the solder joint. A higher wattage soldering iron
Inc. to satisfy particular requirements, or are manufactured
may separate the wiring from the base material. Avoid ex-
to specifications for Tektronix, Inc. Most of the mechanical
cessive heat; apply only enough heat to remove
the cornPo-
parts used in this instrument have been manufactured
nent or to make a good solder joint. Also, apply only enough
Tektronix, Inc. To determine the manufacturer of parts,
solder to make a firm solder joint; do not apply too much
refer to parts list Cross Index Mfr. Code Number to
solder.
Manufacturer.
REV MAY 1982