HP 8711B Service Manual page 110

Category 3 Failures - Inaccurate (but reasonably functional)
Measurements
Troubleshooting Spurious Responses and Inaccurate Data
Spurious Signals
To check RF at A4J4:
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If there are spurs in source RF output only OR receiver LO output only (not both):
If there are spurs in source AND receiver outputs:
To check 10 MHz at A3J3:
If the 10 MHz signal has spurs:
Otherwise:
T roubleshooting and Block Diagrams 4-21