Remove and Replace 4-4 Opening the MS2721B Case
MS2721B MM PN: 10580-00177 Rev. D 4-5
5. Under the DC Power In connector is a ribbon cable. Disconnect either side of this ribbon cable.
6. Unplug the two RF cables (100M SPA and 37.8M IN) that are plugged into the Main PCB.
7. Unplug the Ext Ref In and Ext Trigger In cables from the Main PCB.
8. If the instrument has Option 31, then push the connector downward through the panel. The two halves of
the MS2721B can now be completely separated.
9. If the instrument has Option 31, then securely tape the Option 31 connector to an RF shield on the Main
PCB so that the weight of the GPS connector does not strain the GPS wire.
10. Reassembly is the reverse of disassembly.
Note
Verify that gasket material around the edge of the instrument is in good condition and pressed
securely into the grooves in the covers before reassembling the instrument. If necessary, replace
damaged gasket material. (For the part number, refer to “Replaceable Parts” on page 1-4.)
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