Tektronix 2445, Инструкция по эксплуатации

Страница: 155 / 351

Maintenance— 2445 Service
CORRECTIVE MAINTENANCE
INTRODUCTION
Corrective maintenance consists of component replace­
ment and instrument repair. This part of the manual de­
scribes special techniques and procedures required to
replace components in this instrument. If it is necessary to
ship your instrument to a Tektronix Service Center for repair
or service, refer to the “Instrument Repackaging Instruc­
tions” at the end of this section.
MAINTENANCE PRECAUTIONS
To reduce the possibility of personal injury or instrument
damage, observe the following precautions.
1. Disconnect the instrument from the ac power source
before removing or installing components.
2. Verify that the line-rectifier filter capacitors are dis­
charged prior to performing any servicing.
3. Use care not to interconnect instrument grounds
which may be at different potentials (cross grounding).
4. When soldering on circuit boards or small insulated
wires, use only a 15-watt, pencil-type soldering iron.
OBTAINING REPLACEMENT PARTS
Most electrical and mechanical parts can be obtained
through your local Tektronix Field Office or representative.
However, many of the standard electronic components can
usually be obtained from a local commercial source. Before
purchasing or ordering a part from a source other than
Tektronix, Inc., please check the “Replaceable Electrical
Parts” list for the proper value, rating, tolerance, and
description.
N O T E
P hysical size an d shape o f a com ponent m ay affe c t
instrum ent perform ance, particularly a t high frequen­
cies. A lw ays use direct-replacem ent com ponents, un­
less it is know n th at a substitute w ill n o t degrade
instrum ent perform ance.
Special Parts
In addition to the standard electronic components, some
special parts are used in the 2445. 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 manufactures can be identified by referring to the
“Cross Index-Manufacturer’s Code number to Manufactur­
er” at the beginning of the “Replaceable Electrical Parts”
list. Many 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. Instrument type (include modification or option
numbers).
2. Instrument serial number.
3. A description of the part (if electrical, include its full
circuit component number)
4. Tektronix part number.
MAINTENANCE AIDS
The maintenance aids listed in Table 6-11 include items
required for performing most of the maintenance procedures
in this instrument. Equivalent products may be substituted
for the examples given, provided their characteristics are
similar.
6 - 1 8