Corrective Maintenance; Obtaining Replacement Parts; Component Replacement - Tektronix 7B92 Instruction Manual

Maintenance-7B92 Service
g. Capacitors. A leaky or shorted capacitor can best
be detected by checking the resistance with an ohm-
meter on the highest scale. Do not exceed the voltage
rating of the capacitor. The resistance should be high
after the initial charge of the capacitor. An open
capacitor can best be detected with a capacitance meter
or by checking whether the capacitor passes AC signals.
7. Repair and Readjust the Circuit. If any defective
parts are located, follow the replacement procedures given
in this section. Be sure to check the performance of any
circuit that has been repaired, or that has had any electrical
components replaced.
CORRECTIVE MAINTENANCE
General
Corrective maintenance consists of component replace-
ment and instrument repair. Special techniques required to
replace components in the instrument are given here.
Obtaining Replacement Parts
All electrical and mechanical part replacements for the
7B92 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 Tektronix, Inc. Before
purchasing or ordering replacement parts, check the parts
list for value, tolerance, rating, and description.
NOTE
When selecting replacement parts, it is important to
remember that the physical size and shape of a
component may affect the performance in the instru-
ment, particularly at high frequencies. All replace-
ment parts should be direct replacements unless it is
known that a different component will not adversely
affect instrument performance.
When ordering replacement parts from Tektronix, Inc.,
include the following information.
1. I nstrument Type.
2. Instrument Serial Number.
3. A description of the part (if electrical, include circuit
number).
4. Tektronix Part Number.
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Component Replacement
I
WARNING]
Disconnect the equipment from the power source
before replacing components.
Relay Replacement. The relay in the 7892 is manu-
factured by Tektronix, Inc. If the relay fails, a replacement
may be ordered from your local Tektronix Field Office or
representative. The eight-pin DPDT relay may be replaced
in its socket either way, since this relay is symmetrical.
Semiconductor Replacement. Semiconductor devices
used in this instrument should not be replaced unless
actually defective. If removed from their sockets during
routine maintenance, return them to their original sockets.
Unnecessary replacement may affect the calibration of this
instrument. When a semiconductor is replaced, check the
operation of the part of the instrument that may be
affected.
Replacement devices should be of the original type or
direct replacement. Re-install in the same manner as the
original. Fig. 6-1 (located in diagrams section) shows the
lead configurations of the semiconductor devices used in
this instrument. When replacing, check the manufacturer's
basing diagram for correct basing.
Interconnecting Pin Replacement. Two methods of
interconnection are used in this instrument to connect the
circuit boards with other boards and components. When the
interconnection is made with a coaxial cable, a special
end-lead connector plugs into a socket on the board. Other
interconnections are made with a pin soldered onto the
board. Two types of mating connectors are used for these
interconnecting pins. If the mating connector is mounted
on a plug-on circuit board, a special socket is soldered into
the board. If the mating connector is on the end of a lead,
an end-lead pin connector is used that mates with the
interconnecting pin. The following information provides
the replacement procedure for the various interconnecting
methods.
a. Coaxial-Type End-Lead Connectors.
Replacement of the coaxial-type end-lead connectors
requires special tools and techniques; only experienced
maintenance personnel should attempt replacement of
these connectors. It is recommended that the cable or
wiring harness be replaced as a unit. For cable or wiring
harness part numbers, see the Mechanical Parts List. An
alternate solution is to refer the replacement of the
defective connector to your Tektronix Field Office or
representative.
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