Agilent Technologies HP 8719D Service Manual page 416

Source Assemblies
Replacement
1. Reverse the order of the removal procedure.
Note
When replacing the A9 source control board, push the board
evenly on ah the microcircuit pins.
Check all the pin sockets from the back of the A9 board to
ensure that all of the pins are inserted. For HP 8722Ds, you
may need an eye glass to inspect the shallow pins of the Sl high
band switch.
When replacing the source module into the analyzer, push the
cables aside before seating the module.
Assembly Replacement and Pest-Repair Procedures