HP 8560E Service Manual page 591

RF Section
A7 LODA (LO Distribution Amplifier)
12.If the voltage varies between 0 Vdc and −2 Vdc, adjust the GATE
BIAS for a DVM reading within ±10 mV of the GATE BIAS voltage
listed on A7 LODA label. If the voltage does not vary between 0 Vdc
and −2 Vdc, troubleshoot the A14 frequency control assembly.
13.Disconnect the jumper from A14J19 to A14J10. Press
spectrum analyzer off. Reconnect W12 to A14J10. Press
spectrum analyzer on.
14.If the DVM reading changes significantly, the A7 LODA is probably
defective.
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Chapter 11