HP 8560A Service Manual page 120

Procedure 5. A2, A3, A4, and A5 Assemblies
Removal
1. Remove the analyzer's cover.
2. Place the analyzer on its right side frame.
3. Remove the eight screws holding the A2, A3, A4, and A5 assemblies to the top of the
analyzer. These screws are labeled (a), (3), and (4) in Figure 3-7. They are also labeled on
the back of the A2 board assembly.
4. Remove ribbon cable W4 from A2J6. See Figure 3-7.
Caution
Do not fold the board assemblies out of the analyzer one at a time. Always
fold the A2 and A3 assemblies as a unit and the A4 and A5 assemblies as
a unit. Folding out one assembly at a time binds the hinges attaching the
assemblies and may damage an assembly and hinge.
5. The board assemblies are attached to the analyzer's right side frame with two hinges. Fold
both the A2 and A3 assemblies out of the analyzer as a unit.
6. Fold both the A4 and A5 assemblies out of the analyzer as a unit.
7. Remove the cables from the assembly being removed, as illustrated in Figure 3-9.
8. Remove the two screws that attach the assembly being removed to its two mounting hinges.
Caution
Do not torque shield pozidrive screws to more than 5 inch-pounds. Applying
excessive torque will cause the screws to stretch.
Procedure 5. A2, A3, A4, and AS Assemblies
Assembly Replacement 3-13