A25 Motherboard; Removal - Agilent Technologies PSA Series Service Manual

Assembly Replacement Procedures

A25 Motherboard

A25 Motherboard

Removing the motherboard requires the removal of all the other
assemblies in the instrument. Take care to note the locations of cables
and screws for correct placement during reassembly.
Use ESD precautions when performing this replacement procedure.
CAUTION
The motherboard assembly consists of the A25 motherboard and the
NOTE
MP35 motherboard shield. A replacement motherboard does not
include the shield, so when you change a faulty motherboard you must
transfer the shield to the new motherboard.

Removal

1. Remove the instrument top brace. Refer to the
2. Remove the front frame. Refer to the
3. Remove the vertical assemblies. Refer to the
4. Remove the A5 assembly. Refer to the
5. Remove the A26 assembly. Refer to the
6. Remove the RF section. Refer to the
7. Remove the mid-web/fan assembly. Refer to the
8. Remove the attenuator assembly. Refer to the
9. Remove the W8 front panel ribbon cable from the motherboard.
10.Using the T-10 driver, remove the 6 screws (2) from the bottom of
11.Refer to
382
procedure.
procedure.
Assemblies (Standard Instrument)"
procedure.
removal procedure.
E4445A" removal procedure.
removal procedure.
E4440A, E4443A, E4445A"
Detach the disk drive cover (refer to
remove the W10 disk drive flat flex cable from the motherboard.
the instrument as indicated in
Figure 11-45 on page
the A21 motherboard to the deck. Lift the motherboard out of the
deck.
"Top Brace"
"Front Frame"
"Vertical Board
removal procedure.
"A5 Power Supply"
"A26 CPU Assembly"
"RF Section E4440A, E4443A,
"Fans/Mid Web"
"Attenuator Assembly
removal procedure.
Figure 11-45 on page
Figure 11-47.
379. Remove the 7 screws (2) securing
removal
removal
removal
379) and
Chapter 11