Keysight N5171B EXG Service Manual page 106

Troubleshooting
Amplitude Modulation Problems (N5173B/83B)
3. Using an oscilloscope, measure ALC TP 40
4. Go to
Keysight X-Series Signal Generators Service Guide
You should see a sine wave with an amplitude > 2.5 Vp–p and a period of
2.5 ms.
— If the measured voltage is not > 2.5 Vp–p on ALC TP 40, replace the
A3 RF assembly.
— If the measured voltage is > 2.5 Vp–p on ALC TP 40, replace the A7
Micro Deck.
Chapter 4, "Post-Repair Procedures and Operational Performance
Verification.".
(Figure 1-21).
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