Chapter 11 377
Assembly Replacement Procedures
Fans/Mid Web
Replacement
1. Place the mid-web into position in the deck with the fans on the front
side of the instrument. Take care to avoid pinching any cables or
wires underneath the mid web.
2. Using the T-10 driver, replace the 9 screws that secure the
mid-web/fan assembly to the deck. Torque to 9 inch pounds.
3. Plug the 3 fan connectors into the motherboard.
4. Replace the cables that were removed. Torque any semi-rigid cables
to 10 inch pounds.
5. Replace the power supply. Refer to the “A5 Power Supply”
replacement procedure.
6. Replace the vertical board assemblies. Refer to the “Vertical Board
Assemblies (Standard Instrument)” replacement procedure.
7. Replace the attenuator assembly. Refer to the “Attenuator Assembly
E4440A, E4443A, E4445A” replacement procedure.
8. Redress the cables in the mid-web so they will not be pinched under
the top brace or interfere with any fan operation.
9. Replace the front frame assembly. Refer to the “Front Frame”
replacement procedure.
10.Replace the instrument top brace. Refer to the “Top Brace”
replacement procedure.
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