198 Chapter 4
Assembly Replacement
A21 Motherboard
A21 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.
CAUTION Use ESD precautions when performing this replacement procedure.
NOTE The motherboard assembly consists of the A21 motherboard and the
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 “Top Brace” removal
procedure.
2. Remove the front frame. Refer to the “Front Frame” removal
procedure.
3. Remove the A17, A18, and A19 assemblies. Refer to the “A17 RF,
A18 Reference, and A19 Synthesizer Assemblies” removal
procedure.
4. Remove the A10 and the A12 assemblies. Refer to the “A10 Digital
IF and A12 Analog IF Assemblies” removal procedure.
5. Remove the A7 assembly (if installed). Refer to the “A7 Baseband I/Q
Assembly (Option B7C)” removal procedure.
6. Remove the A6 assembly. Refer to the “A6 Power Supply” removal
procedure.
7. Remove the A22 assembly. Refer to the “A22 Processor Assembly”
removal procedure.
8. Remove the mid-web/fan assembly. Refer to the “Mid Web/Fans”
removal procedure.
9. Remove the A15 daughter board/center-web assembly. Refer to
“Center Web Cables W9, W11, and W12” removal procedure.
10.Remove the W8 front panel ribbon cable from the motherboard.
Detach the disk drive cover (refer to Figure 4-5 on page 178) and
remove the W10 disk drive flat flex cable from the motherboard.
11.Using the T-10 driver, remove the 7 screws (2) from the bottom of
the instrument as indicated in Figure 4-20.
12.Refer to Figure 4-19. Remove the 5 screws (1) securing the A21
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