HP 8711B Service Manual page 103

Category 2 Failures - No Error Message, but Nonfunctional
Measurement
Troubleshooting the A3 Fractional-N/Reference Assembly
Check the Output Power
If there is no source output or noisy trace at about 25 dB:
If the signal is not steady (i.e. appears unlocked), or if the frequency doesn't change
properly):
Phase Lock Problems
To verify the 10 MHz reference signal:
Note
6
4-14 T roubleshooting and Block Diagrams