Chapter 4 201
Assembly Replacement
A21 Motherboard
Replacement
1. Using the T-10 driver, assemble the motherboard to the motherboard
shield with the 13 screws (1) indicated in Figure 4-21. For
alignment purposes, tighten the screws marked on the mother board
with a #1 and a #2 first, then tighten the remaining screws. Torque
to 9 inch pounds.
2. Refer to Figure 4-19. Place the motherboard into position in the
deck. Using the T-10 driver, replace the screws that secure the
mother board to the deck. For alignment purposes, tighten the
screws in the order marked on the motherboard #1 and #2 first, then
tighten the #3, #4, and #5 screws. Torque to 9 inch pounds.
3. Using the T-10 driver, replace the 7 screws on the bottom of the
instrument as indicated in Figure 4-20. Torque to 9 inch pounds.
4. Reattach the W10 flat flex cable and W8 ribbon cable to the
motherboard.
5. Replace the A15 daughter board/center-web assembly. Refer to the
“A15 Daughter Board” replacement procedure.
6. Replace the mid-web/fan assembly. Refer to the “Mid Web/Fans”
replacement procedure.
7. Replace the A6 assembly. Refer to the “A6 Power Supply”
replacement procedure.
8. Replace the A22 assembly. Refer to the “A22 Processor Assembly”
replacement procedure.
9. Replace the A10 and the A12 assemblies. Refer to the “A10 Digital
IF and A12 Analog IF Assemblies” replacement procedure.
10.Replace the A7 assembly (if installed). Refer to the “A7 Baseband I/Q
Assembly (Option B7C)” replacement procedure.
11.Replace the A17, A18, and A19 assemblies. Refer to the “A17 RF,
A18 Reference, and A19 Synthesizer Assemblies” replacement
procedure.
12.Replace the front frame assembly. Refer to the “Front Frame”
replacement procedure.
13.Replace the instrument top brace. Refer to the “Top Brace”
replacement procedure.
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