Agilent Technologies HP 8719D Service Manual page 239

Band-Related Problems
Assemblies Potentially Responsible for Band-Related
Low Band
Note
Problems in RF components, crimped RF cables, and improper
connections which generally cause power holes in an RF signal
may cause symptoms that indicate a band-related problem.
Start by measuring power from S2 (Sl, HP 8722D Only). If the power here
then
is good,
with "Broadband Power Problems" to check other components. Also keep the
following points in mind.
Remove the instrument covers.
n
Cables having improper connections can be the problem in all cases.
n
Use the flexible RF cable from the tool kit to measure power at otherwise
n
inaccessible connections.
Before replacing suspect assemblies, refer to "Al5 Interface Power Supplies"
n
to check bias voltages.
Low Band Problems:
1. Calibrate and zero a power meter and connect it to S2J3.
Problems
Mid Band
(HP 8722D Only)
Source Troubleshooting