Tektronix TM 503 User Manual

System Maintenance--TM 503
TROUBLESHOOTING AIDS
Introduction
The following is provided to augment information
contained elsewhere in this and other TM 500 Series family
manuals when troubleshooting becomes necessary.
Circuit Descriptions
Each manual has a section devoted to explaining circuit
operating theory. Used conjointly with the schematics, this
can be a powerful analytic tool.
Diagrams
Block diagrams and detailed circuit schematics are
located on foldout pages in the service section of most of
the TM 500 Series family manuals, The schematic diagrams
show the component values and assigned circuit reference
numbers of each part necessary to the circuit design.
Usually the first page of the service sections defines the
circuit symbols and reference designators used in that
particular instrument, Major circuits are usually identifi-
able by a series of component numbers. Important wave-
forms
and voltages may be shown within the diagrams or on
adjoining aprons. Those portions of the circuits located on
circuit boards are enclosed with a blue tint outline.
Cam Switch Charts
Cam switches shown on the diagrams are coded on
comprehensive charts to locate the cam number of the
switch contact in the complete switch assembly, counting
from the front, or knob end, toward the rear of the switch,
The charts also indicate with a solid dot when each contact
is closed.
Circuit Board Hlustrations
Line Hlustrations showing component locations keyed
with a grid scheme for each circuit board are usually placed
on the back of a foldout page and sequenced as close as
possible to an associated schematic. The GRID LOC
column in the Electrical Parts Lists keys each component to
the Location illustrations.
Component and Wiring Color Codes
Colored stripes or dets on electrical components signify
electrical values, tolerances, etc., according to EIA
standards. Components not color-coded usually have
information printed on the body. The wiring coding follows
the same EIA standards.
Testing Equipment
Generally, a wide-band oscilloscope, a probe, and a
multimeter are all that is needed to perform basic waveform
and voltage checks for diagnostic purposes. The calibration
procedures in the manual for each plug-in module list
specific test equipment and the features necessary to
adequately check out that particular module.
TROUBLESHOOTING TECHNIQUES
Introduction
This troubleshooting procedure is arranged in an order
which checks the simple trouble possibilities before pro-
ceeding to extensive troubleshooting.
Control Settings
Incorrect control settings can indicate a trouble that does
not exist. {f there is any question about the correct
function or operation of any control, see the Operating
Instructions section of the manual for the instrument
involved,
System and Associated Equipment
Before proceeding with troubleshooting the TM 500
Series system, check that the instruments in the system are
operating correctly. Check for proper interconnection
between the power module and the plug-in modules. Check
the line voltage at the power source. Check that the signal is
properly connected and that the interconnecting cables and
the signal source are not defective.
The associated plug-in modules can be checked for
proper operation quickly by substituting other like units
REV.B, AUG, 1976

Tektronix TM 503 Specifications

General

Brand	Tektronix
Model	TM 503
Category	Control Unit
Language	English