Agilent Technologies 8590 Series Service Manual page 325

Use the two-prong board-puller tool to remove the IF board assemblies
CAUTION
that do not have attached covers. Traces on the printed circuit boards
can be damaged if tools with sharp edges are used to remove the IF
board assemblies.
Figure 7-12 A15 Motherboard Replacement
11.Remove the five IF board assemblies (8) from the IF extrusion and
12.Remove the five screws (9) that secure the A15 motherboard to the
Chapter 7
place them in a static-safe container.
instrument chassis.
Replacing Major Assemblies
A15 Motherboard and IF Extrusion
325