Agilent Technologies 8590L Service Manual page 327

Replacing Major Assemblies
A15 Motherboard and IF Extrusion
The IF extrusion assembly contains one flat extrusion end-section.
NOTE
Make sure that the extrusion assembly is positioned with the flat
extrusion end-section next to the A8 Power Supply connector (18). See
Figure
19.Turn the A15 motherboard upside down and align it with the IF
20.Replace the 40 screws (12) that secure the IF extrusion assembly to
21.If the instrument came equipped with a card-cage:
Do not twist the motherboard sideways while inserting its connector
CAUTION
into the A16 board assembly connector. This prevents damage to either
connector.
22.Lower the motherboard assembly into the instrument chassis and
23.If it is difficult to insert the motherboard connector into the
24.Make sure that the holes in the motherboard assembly line up with
If the holes do not line up, loosen the screws that secure the A16
NOTE
Processor/Video Board assembly to the instrument chassis. Refer to the
"A16 Processor/Video Board and A16A1 Memory Board Assembly."
replacement procedure.
25.Replace the five screws (9) that secure the A15 motherboard to the
26.Replace the five IF board assemblies (8) in the IF extrusion.
27.Place each IF cover over its corresponding IF board assembly.
328
7-13.
extrusion assembly.
the motherboard.
a. Replace the card-cage bracket and align it with the two holes on
the motherboard.
b. Replace the two screws (11) that secure the card-cage bracket to
the motherboard without tightening. See
c. Turn the motherboard assembly right side up and replace the
four screws (10) that secure the card-cage bracket to the sides of
the IF extrusion assembly.
d. Tighten the two screws (11) on the bottom-side of the
motherboard.
align it with the connector on the processor/video board assembly.
processor/video connector, a slight rocking action, from front to rear,
will help it drop into place.
the holes in the instrument chassis.
instrument chassis.
Figure 7-13.
Chapter 7