Troubleshooting
TLA7AXX Logic Analyzer Module Service Manual
6- 31
The Primary Troubleshooting Tree (Figure 6--15 on page 6--32) 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
LPU 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 steps 3a and 3b 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 circuit board indicated by the
troubleshooting tree. For further confirmation, you can correlate the failed
test displayed with a board using Table 6--5 on page 6--33.
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.
H
If the kernel group passes, but there are other failures, replace the
Acquisition board. Also, ensure that the probes are disconnected from
the module before running the diagnostics.
H
If multiple tests fail, the problem could be power-supply related
problems or the mainframe. If replacing the Acquisition board does not
remedy the failures, try replacing the LPU board.
NOTE
. Due to the module design, there are no accessible test points on the
module to connect external test equipment, to help isolate faults to an individual
circuit board.
Fault Isolation Procedure
Summary of Contents for TLA7AA1
Page 5: ......
Page 17: ...Service Safety Summary xii TLA7AXX Logic Analyzer Module Service Manual...
Page 23: ...Preface xviii TLA7AXX Logic Analyzer Module Service Manual...
Page 27: ...Introduction xxii TLA7AXX Logic Analyzer Module Service Manual...
Page 63: ...Operating Information 2 20 TLA7AXX Logic Analyzer Module Service Manual...
Page 157: ...Troubleshooting 6 38 TLA7AXX Logic Analyzer Module Service Manual...
Page 163: ...Electrical Parts List 8 2 TLA7AXX Logic Analyzer Module Service Manual...
