Troubleshooting
Troubleshooting Assembly Level Problems
1-23
LEDs for +9, -6 or -5.2 Vdc Power Supplies Not Working
These supplies are generated on the A9 YIG Driver.
To troubleshoot, make sure the A9 YIG Driver is receiving the +32, +15, +10, -7, -15 Vdc supplies. These can
be measured at P112 on the A31 Motherboard. Refer to the Power Supplies vs. Assembly Matrix
(Table 1-13 on page 1-18) for pin numbers.
If the supplies are present at P112, use the Power Supplies vs. Assembly Matrix (Table 1-13 on page 1-18) to
find out where each supply is being used. To isolate the defective assembly, power down the signal generator
and remove one of the assemblies being biased by the faulty supply. Power the signal generator up again and
check the faulty supply. If the supply is still bad, power down the signal generator and re-install the first
assembly removed. Remove the next assembly and see if the problem is alleviated. Continue this process until
the supply is functioning properly. Replace the last assembly that was removed.
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