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Chapter 6 Service and Repair
Troubleshooting
4
6
Main Board LED Does not Light up after Boot
This indicates that the processor was unable to program the FPGA. Most
likely there is a communications failure from the processor board to the
main board. Probe the following serial data lines at power up with an
oscilloscope:
J201, pin 23
J201, pin 24
J201, pin 26
J201, pin 32
• If all of the above SPI lines show activity during FPGA
programming, then the main board is the most likely cause of the
failure.
• If any of the SPI lines fail to show activity, then processor board is
the most likely cause of the failure.
10 MHz Out
If the power supplies are functional and self-test passes. Check the 10
MHz out at the rear panel. This output is present whenever the
instrument has powered on and the processor and main board are
operational. If the 10 MHz is present, but the display is not working,
suspect the front panel board or display assembly.
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