Remove and Replace 4-13 Function Key Membrane and Switchpad Replacement
MS2721B MM PN: 10580-00177 Rev. D 4-11
3. Reverse the above steps to install the replacement assembly, with the following cautions:
a. Carefully close the locking tab on connector J2 to secure the flexible switchpad connection. The tab
should "snap" into position when fully closed.
b. Insert the membrane over the keypad PCB, and under the speaker. Take care to properly orient
the membrane so that the rubber pins are aligned with the keypad switches on the PCB.
c. The speaker is held in place by 4 locating pins on the inside of the keypad bezel. Verify that the
4 locating pins are properly seated into the 4 corner holes of the speaker when reinstalling the
bezel.
d. Verify that all locking tabs are fully seated into the main body of the case when reinstalling the
bezel.
4-13 Function Key Membrane and Switchpad Replacement
This procedure provides instructions for replacing the function key membrane and switchpad. All keypad parts
can be replaced without opening the MS2721B case.
1. Place the instrument face up on a static protected work surface.
2. Remove the keypad bezel and membrane as directed in the section immediately above.
3. Six locking tabs hold the function key bezel to the case. Using a small flat blade screwdriver or knife
blade, carefully pry the function key bezel locking tabs free of the main body of the case. This will expose
the function key membrane.
4. Remove the function key membrane by gently pulling the membrane up and away from the front panel
(Figure 4-12).
5. Disconnect the function key flexible switchpad from connector J2 of the keypad PCB by carefully lifting
the locking tab on connector J2 to release the flexible switchpad.
6. Reverse the above steps to install the replacement switchpad or membrane.
7. Carefully close the locking tab on connector J2 to secure the flexible switchpad connection. The tab should
"snap" into position when fully closed.
Figure 4-12. Function Key Membrane and Switchpad
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