E8257D/67D, E8663D PSG Signal Generators Service Guide
Troubleshooting
Troubleshooting Assembly–Level Problems
1-36
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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