Timing Option; Troubleshooting; Diagnostic Flow Charts; Substitution-The Easiest Test - Tektronix PM 101 Instruction Manual

Timing Option. The Self Test Stimulus Circuitry also
provides stimulus for the Timing Option probe, P6451.
This stimulus is the reference for the TIMI NG OPTION test
(Test B) on the Diagnostic Monitor menu. Sub-test 1 is
internal to the 7D02 and runs even without the Timing
Option Probe connected.

Troubleshooting

While the Logic Analyzer-Personality Module system
is quite complex, it has built in diagnostic routines which
simplify troubleshooting. Power-up Diagnostics, which
are a limited version of the full diagnostic program, run
every time the instrument is turned on. If a failure is
detected, the "Power-up Verification" test results are
displayed. This display offers the operator the choice
between beginning operation or displaying the Diagnostic
Monitor menu. That menu in turn offers the operator the
choices of running any or all of the Module Tests, or of
exiting the Diagnostic Monitor,
Signature Exerciser menu within the Diagnostic Monitor.
Depressing and holding any keyboard button within
approximately three seconds of pulling the POWER
switch on will simulate a failure and allow the operator to
access the Diagnostic Monitor.
Some problems may only occur when the instru­
ment is fully warmed up. Allow 20 minutes for this
purpose.
Diagnostic Flow Charts. When the diagnostic routines
detect a failure these flow charts will help the technician
isolate a particular IC or group of IC's for signature
analysis or conventional troubleshooting. Refer to Figs. 6-
4 through 6-9.
@
or displaying the
NOTE
Maintenance and Troubleshooting-PM 101
Substitution-the easiest test. If other Logic Analyzers
or Personality Modules are available, try substituting them
and running the diagnostics again.
Exercise caution with power supply problems, since
a seriously out of tolerance power supply could
cause secondary damage in more than one unit.
"Check ... ". The word "check" as used in the
Diagnostic Flow Chart means:
A VISUAL INSPECTION for damage, connection con­
tinuity, or shorts.
SIGNATURE ANALYSIS-See the signature analysis
subsection below.
VOLTAGE CHECK of local power supply line(s).
WAVEFORM ANALYSIS of the signal quality. For
example, rise and fall times, amplitude, ringing, noise
or glitches, as applicable.
Intermittent Problems. A whole section of the flow
chart deals with intermittent failures. If the problem is
known to occur infrequently, skip ahead in the Flow Chart
and begin LOOPING the test most likely to exercise the
affected area.
Setup and Hold Performance Checks. The Diagnostic
Flow Chart sometimes directs the reader to PM 101 or
7D02 Setup and Hold Performance Checks. These tests
check the response speed of portions of the system and
may be useful in finding some intermittent problems.
Performing them requires additional equipment and con­
siderable time, however. Refer to Section 5 of this manual.
6-5