Eliminate Other Problem Sources; Troubleshoot The Module - Tektronix TLA7B Series Service Manual

Eliminate Other Problem Sources

Substitute Good Module

Troubleshoot the Module

Equipment Required
TLA7Bxx Logic Analyzer Module Service Manual
The module is part of the Tektronix Logic Analyzer Family, which consists
of one or more instrument modules installed in either a benchtop or portable
mainframe. The following procedures will help you eliminate the mainframe and
other modules as possible sources of failures.
If you have a known-good module available, perform the following procedure:
1. Remove the suspect module from the mainframe.
2. Install a known-good module in the same slot as the suspected module (verify
that address switches on the rear of the module are set to same address as
the module that you are replacing).
3. Power-on the instrument and check for normal operation.
4. If the failure symptoms are still present with the known-good module
installed, the problem most likely is in the mainframe or in the attached
probes, not in the module.
5. To eliminate the probes, use known-good probes and verify that the probes
are properly connected to the SUT.
NOTE.
Viewing the diagnostic window from the TLA application can help you
isolate failures to individual modules or to the mainframe.
6. If the instrument operates normally with the known-good module and
with known-good probes, the suspect module needs to be repaired. (See
Troubleshoot the Module.)
Follow the procedures in this section to identify the failed part within the
module. These procedure require that the module is installed in a fully functional
mainframe. If you have not determined that the mainframe is functional, or if
you suspect the problem might be in a probe or in another module, you need to
eliminate those possibilities. (See page 15, Eliminate Other Problem Sources.)
The basic troubleshooting procedures require minimal test equipment. There are
no accessible test points to measure voltages.
Troubleshooting
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