Procedure 9. Al4 and Al5 Assemblies
Caution
DO NOT fold the board assemblies out of the analyzer one at a time. Always
fold the Al4 and Al5 assemblies as a unit. Folding out one assembly at a time
binds the hinges attaching the assemblies and may damage an assembly and
hinge.
4. The board assemblies are attached to the analyzer’s right side frame with two hinges. Fold
both the Al4 and Al5 assemblies out of the analyzer as a unit.
5. Remove all cables from the assembly being removed.
6. Remove the two screws that attach the assembly being removed to its two mounting hinges.
Caution
DO NOT torque shield screws to more than 5 inch-pounds. Applying
excessive torque will cause the screws to stretch.
Replacement
1. Attach the removed assembly to the two chassis hinges with two
panhead
screws.
2. Attach all cables to the assembly as illustrated in Figure 3-20.
3. Lay the Al4 and Al5 assemblies flat against each other in the folded out position. Make
sure that no cables become pinched between the two assemblies. Ensure that all coaxial
cables are clear of hinges and standoffs before continuing onto the next step.
4. Fold both board assemblies into the analyzer as a unit. Use caution to avoid damaging any
cable assemblies.
5. Secure the assemblies using the eight screws and washers removed in “Removal” step 3.
Place a washer (2) on the appropriate screws. See Figure 3-19.
6. Secure the analyzer’s cover assembly as described in Procedure 1, “Analyzer Cover.”
Assembly Replacement 3-35
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