Maintenance-2225 Service
NOTE
that affects circuitry for which a selected component
has been specifically chosen.
Physical size and shape of a component may
affect instrument performance, particularly at
high frequencies. Always use
direct-
replacement components, unless it is known
that a substitute will not degrade instrument
performance.
Special Parts
In addition to the standard electronic components,
some special parts are used in the instrument.
These components are manufactured or selected by
Tektronix, Inc., to meet specific performance
requirements, or are manufactured for Tektronix,
Inc., in accordance with our specifications. The
various manufacturers can be identified by referring
to the Cross Index-Manufacturer's Code number to
Manufacturer at the beginning of the Replaceable
Electrical Parts list. Most of the mechanical parts
used in this instrument were 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., be sure to include all of the following
information:
1. lnstrument type (include all modification and
option numbers).
2. lnstrument serial number
3.
A description of the part (if electrical, include
its full circuit component number).
4.
Tektronix part number
Selectable Components
MAINTENANCE
AIDS
The maintenance aids listed in Table
6-5
include
items required for performing most of the
maintenance procedures in this instrument.
Equivalent products may be substituted for those
given, provided their characteristics are similar.
INTERCONNECTIONS
Interconnections in this instrument are made with
wire-trap connectors soldered onto the circuit
boards. If any individual wire in the cable is faulty,
the entire cable assembly should be replaced. To
remove a cable from a wire-trap connector, press
down on top of the connector and lift out cable.
Reinstallation is the reverse of this procedure. To
provide correct orientation of a cable, a number
"
1
"
is stamped on the circuit board. The cable is either
color-coded, so the index is the brown wire, or the
index wire is striped a different color than the rest of
the cable. Be sure the index wire is aligned with the
"1"
when a cable is reinserted into the connector
(see Figure
6-1
,
shown previously).
TRANSISTORS AND INTEGRATED
CIRCUITS
Transistors and integrated circuits should not be
replaced unless they are actually defective. If
removed from their sockets or unsoldered from the
circuit board during routine maintenance, return
them to their original board locations. Unnecessary
replacement or transposing of semiconductor
devices may affect the adjustment of the
instrument. When a semiconductor is replaced,
check the performance of any circuit that may be
affected.
Several components in the instrument are selectable Any replacement component should be of the
to obtain optimum circuit operation. Value selection original type or a direct replacement. Bend transistor
of these components is done during the initial leads to fit their circuit board holes, and cut the
factory adjustment procedure. Usually, further leads to the same length as the original component.
selection is not necessary for subsequent See Figure 9-2 in the Diagrams section for
lead-
adjustments unless a component has been changed configuration illustrations.
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