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Troubleshooting
6–66
TDS 684A, TDS 744A, & TDS 784A Service Manual
Replace the A11 DRAM
Processor/Display module.
Select the extended diagnostics
menu and run all the test suites (the
discussion of the Diagnostics on
page 6–57 explains how to do this).
Do the
Processor/Acq tests
pass now?
No
Yes
There is a problem in the
communication link between the A10
Acquisition and the A11 DRAM
Processor/Display module. The A10
Acquisition most likely failed, so
replace this module. Run the Extended
Diagnostics again.
This procedure helps
you determine whether the
A10 Acquisition or the A11 DRAM
Processor/Display module is bad.
Do the
Processor/Acq
tests pass now?
Yes
No
Done.
Done.
Replace the A14 D1 Bus module.
Be sure you connect the A14 D1
Bus module correctly (the
silkscreen on the module will help
you correctly orient the module).
Figure 6–33: Processor/Acquisition Troubleshooting Procedure