198 Chapter3
Assembly Replacement
Procedure 9. A14 and A15 Assemblies
CAUTION DO NOT fold the board assemblies out of the spectrum analyzer one at
a time. Always fold the A14 and A15 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 spectrum analyzer right
side frame with two hinges. Fold both the A14 and A15 assemblies
out of the spectrum 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 8 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 3-26 on
page 199. When connecting W34 to A15, torque the SMA connector
to 113 Ncm (10 in-lb).
3. Lay the A14 and A15 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 spectrum analyzer as a unit.
Use caution to avoid damaging any cable assemblies.
5. Secure the assemblies using the eight screws removed in step 3
under "Removal." See Figure 3-25 on page 197.
6. Secure the spectrum analyzer cover assembly as described in
"Procedure 1. Spectrum Analyzer Cover."
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