Agilent Technologies HP 8719D Service Manual page 244

5.
For the HP 8722D:
If you measure at least -8 dBm (-3 dBm, Option 007) at the port: replace
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the A59 source interface board assembly.
If you measure less than -8 dBm (-3 dBm, Option 007) at the port:
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press m and R&l: lW 522 (B/R> or R&X:
measure power at the other port:-' ~
If you measure less than -8 dBm (-3 dBm, Option 007) at the other port:
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continue with "A69 Step Attenuator Check" next.
If you measure at least -8 dBm (-3 dBm, Option 007) at the other port
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either the directional coupler or the bias tee or the transfer switch (S4)
is faulty. The power loss through each of these components should be
negligible.
1. Measure the input and output power of the step attenuator; the loss should
be negligible if the attenuator is set to 0 dB.
2. If the 5 dB attenuation steps seem inconsistent, the "Operator's Check"
procedure in Chapter 4, "Start Troubleshooting Here," can be performed
again.
and