Removing Rear Panel Assemblies; Removing The Filter Pca (A12); Removing The Encoder (A2) And Display Pcas; Removing The Keyboard And Accessing The Output Block - Fluke 5520A Service Manual

5520A
Service Manual
4-5.

Removing Rear Panel Assemblies

Proceed as follows to remove the transformer and the ac line input filter. Figure 4-1
shows an exploded view of the rear panel assemblies.
1. Remove the two rear handles by removing the six Allen screws from the handles.
2. Remove the eight Phillips screws from the bottom cover.
3. Remove the bottom cover.
4. Remove the three Phillips screws that are accessible through holes in the bottom
5. Remove the power switch pushrod.
6. Remove the rear panel. There are three large cables, plus one for fan power. This
4-6.

Removing the Filter PCA (A12)

Proceed as follows to remove the Filter PCA (A12):
1. Remove the top cover and guard box cover as described under "Removing Analog
2. Remove all the analog modules.
3. Remove the five Phillips screws from the front side of the rear guard box wall.
4. Lift out the Filter PCA.
4-7.

Removing the Encoder (A2) and Display PCAs

Proceed as follows to remove the Encoder PCA (A2) and display pcas. Figure 4-2 shows
an exploded view of the front panel assemblies.
1. Remove top and bottom covers.
2. With the bottom side up, unplug all the cables going to the front panel. One of these
3. Remove the two front handles by removing the six Allen screws from the handles.
4. Remove the front panel. The Encoder PCA (A2) and display pcas are now accessible.
4-8.

Removing the Keyboard and Accessing the Output Block

To remove the keyboard and access the output block, proceed as follows:
1. Do all four steps of the previous procedure.
2. Unlatch the plastic catches that fasten the front panel together.
3. Remove the four Phillips screws that are around the output block.
4. Remove the output cables.
5. Separate the two main parts of the front panel.
4-4
flange.
assumes that you have already removed the Main CPU (A9). If the Main CPU is still
installed, there will be one more cable.
Modules."
cables is fastened by a cable tie that must be cut, then replaced with a new one when
reassembling.