Tektronix 503, Инструкция по эксплуатации

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SECTION 4
M AINTENANCE
Type 5 0 3
Introduction
This section of the manual contains maintenance inform a­
tion for use in preventive maintenance, corrective main­
tenance or troubleshooting of the Type 503.
PREVENTIVE MAINTENANCE
Visual Inspection
Every few months, the oscilloscope should be visually
inspected so that possible circuit defects may be detected.
These defects may include such things as loose or broken
connections, damaged binding posts, improperly seated
tubes, scorched wires or resistors, missing tube shields,
and broken terminal strips. For most visual troubles the
remedy is apparent; however, particular core must be taken
when heat-damaged components are detected. Overheating
of ports is often the result of other, less apparent, defects
in the circuit. It is essential to determine the cause of over­
heating before replacing heat-damaged parts, in order to
prevent further damage.
Calibration
The Type 503 Oscilloscope is a stable instrument which
should provide many hours of trouble-free operation. H ow ­
ever, to insure the reliability of measurements we suggest
calibration of the instrument after coch 500 hours of opera
tion (or every six months if used intermittently}. A complete
step-by-step procedure for calibrating the instrument is pre­
sented in the C alibration section of this manual.
CORRECTIVE MAINTENANCE
General
Procedures required for replacement o f many parts in
the Type 503 Oscilloscope are obvious. Detailed instruc­
tions for their removal arc therefore not required. Other
parts, however, can best be removed if a definite procedure
is followed. Instructions for the removal o f some o f these
parts are contained in the follow ing paragraphs. Because
of the nature of the instrument, replacement of certain
parts w ill require recalibration o f sections of the oscilloscope
to insure proper operation. Refer to the C alibration section
of this manual.
Obtaining Replacement Parts
Standards Parts. All electrical and mechanical part
replacements for the Type 503 can be obtained through
your local Tektronix Field Office or representative. H ow ­
ever, 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 replace­
ment parts, consult the Parts List for value, tolerance, and
rating.
Special Parts. In addition to the standard electronic
components, some speciol parts are used in the Type 503.
These parts are manufactured or selected by Tektronix, Inc.
to meet specific performance requirements, or are manu­
factured for Tektronix, Inc. in accordance with our specifi­
cations. These special parts are indicated in the Parts List
by an asterisk preceding the part number. Most of the
mechanical parts used in this instrument have been manu­
factured by Tektronix, Inc. O rder all special parts directly
from your Tektronix Field O ffice or representative.
Ordering Parts. When ordering replacement parts from
Tektronix, include the following information:
1. Instrument Type.
2. A dcscirpition of the part (if electrical, include circuit
number).
3. Tektronix Part Number.
4. Instrument Seriol Number.
Removal of Panels
The panels of the Type 503 Oscilloscope are held in
place by scrcwhead fasteners. To remove the side panels,
use a screwdriver to rotate the fasteners approximately
two turns counterclockwise; then pull the upper portion of
the panels outward from the carrying handles (sec Fig.
4-1). Panels are replaced by reversing the order of their
removal.
©
4-1
Fig. 4 -1 . Removing the oscilloscope side panels.