Agilent Technologies 856290216 service manual Procedure 9. Al4 and Al5 Assemblies

Procedure 9. Al4 and Al5 Assemblies

Caution	DO NOT fold the board assemblies out of the spectrum 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 right side frame of the spectrum analyzer with two hinges. Fold both the Al4 and Al5 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 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 4-19. Torque the W34/A15 SMA connection to 113 Ncm (10 in-lb).

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 spectrum analyzer as a unit. Use caution to avoid damaging any cable assemblies.

5.Secure the assemblies using the eight screws removed in “Removal” step 3. See Figure 4-18.

6.Secure the spectrum analyzer cover assembly as described in “Procedure 1. Spectrum Analyzer Cover.”

4-38 Assembly Replacement