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Maintenance
Access Procedures
6
6-11
4. If you want to completely remove the Digital assembly, remove the ribbon cable by
releasing the catches on the board-mounted connector.
Caution
When replacing the Digital assembly, make sure the ribbon
cable is pulled fully into the 5725A chassis. Be sure to leave no
fold trapped between the back of the pca and the metal panel or
else shorting to the component leads can occur.
6-10. Accessing the Current Amplifier Assembly (A2)
Warning
To avoid electrical shock, do not proceed with the following
access procedure until you have completed the initial access
procedure, which removes line power and checks for high
voltage on the power supply. This assembly drops into an area
of live line voltage.
The Current Amplifier assembly lays flat on the top of the instrument, toward the rear.
Proceed as follows to access the Current Amplifier assembly:
1. Perform the Initial Access Procedure.
2. Turn over the 5725A so that the bottom is facing up.
3. Remove the bottom cover by removing the six screws on the bottom surface.
4. Remove the two screws labeled _A and _B and turn the 5725A over again.
5. Remove the five retaining screws on the Current Amplifier assembly. Lift the
Current Amplifier assembly by pulling on the plastic wire-tie loops, and place the
assembly in the service position.
Caution
When reinstalling the assembly, refer to Figure 6-6 and make
sure cable harnesses are dressed as shown, to avoid shorting
wires to the bridge rectifier heat sink or chassis.
Note
When reinstalling the assembly, lower it into place squarely to make sure
its connector seats correctly in the Interconnect assembly connector.