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Troubleshooting
Troubleshooting Assembly–Level Problems
3. If both the I and Q signals are good, reconnect the cable removed in Step 2. Check the signals at
the A8 Output board.
a. At J53-8, repeat the Q offset check in Step 1.
• If the signal is good, replace the A8 Output board.
• If the signal is bad, replace the A31 Motherboard.
b. At J53-19, repeat the I offset check in Step 2.
• If the signal is good, replace the A8 Output board.
• If the signal is bad, replace the A31 Motherboard.
405 Gain Adjustment Test
• Replace the A8 Output.
406 Prelevel Bypass Test
• Replace the A8 Output.
407 Switched Filters Test
• Replace the A8 Output.
408 ALC Reference DAC Test
• Replace the A8 Output.
409 ALC Modulation Test
• Replace the A8 Output.
410 Burst Mod Driver Test
• Replace the A8 Output.
411 ALC Detector Test
• Replace the A8 Output.
412 Het Band Test
Measure the 1 GHz signal from the A7 Reference board:
1. Turn on the signal generator.
2. Set CW = 200 MHz.
3. Using a spectrum analyzer, probe P51-19.
There should be a 1 GHz signal, that is >−30 dBm.
• If the signal is good, replace the A9 Output.
• If the signal is not good, run the A7 self-tests.
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