Tektronix TLA7N Series Service Manual page 141

Fault Isolation Procedure
TLA7Nx, TLA7Px, & TLA7Qx Logic Analyzer Module Service Manual
While the tests are executing, the word Running displays adjacent to the tests.
When the tests are complete, either a Pass or Fail indication displays adjacent to
each test.
The Primary Troubleshooting Tree (Figure 6- -15 on page 6- -35) provides
troubleshooting steps that test the logic analyzer module. Use the following
procedure with that tree.
To determine if module is recognized, perform the following steps:
1. Install the logic analyzer module into a known-good mainframe.
2. Before you power on the mainframe, look at the READY, ACCESSED
ARM'D, and TRIG'D front panel indicators.
3. Power on the mainframe and note how the front panel indicators respond.
a. Verify that the green READY indicator turns on while the diagnostics
are being checked. If the green READY indicator does not turn on, the
module is not being recognized which indicates possible problems on the
Local Processor Unit board.
b. Verify that after a few seconds the ACCESSED indicator turns on. The
indicator stays on while the module is accessed by the controller. After
the System window displays, the indicator blinks anytime the controller
accesses the module.
4. If a and b are verified, the module is recognized; if not verified, the module
is not recognized. Proceed as the troubleshooting tree instructs.
5. If diagnostic failures occur, replace the board indicated by the tree. For
further confirmation, you can correlate the failed test displayed with a board
using Table 6- -7 on page 6- -36. You should also first check the "special
cases" of diagnostic failures below:
H Note from the tree, that if all the diagnostics pass, but self calibration
fails, replace the Acquisition board.
H If any of the Kernel test groups fail (ROM check, LPU RAM, LPU
Address decode, etc.) replace the LPU board.
Troubleshooting
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