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Chapter 6 Service and Repair
Troubleshooting
6
Main Board LED Lights up after Boot
This indicates that the FPGA is programmed and running. Most likely
there is a communications failure from the main board to the processor
board. Probe the J201, pin 27 line with an oscilloscope, and cycle power
on the unit (wait for full boot) to see if there is activity on the line.
Activity should be +3.3 V pulses (isolated). Note that activity ceases once
the waveform generator is booted.
• If there is no activity on the line even after the LED lights up,
then most likely the main board is the cause of the failure.
• If there is activity on the line, then the processor board is the most
likely cause of the failure
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