Keysight Technologies FieldFox N9913A Service Manual page 118

Repair and Replacement Procedures
Removing and Replacing the Case Group Parts
8. Position the cases side-by-side as shown in Figure 7-8.
9. Unplug the battery cable, W15, from the A5 System board at the location
indicated.
10.The front and rear cases are now completely separated.
Figure 7-8 Separating the Front and Rear Cases (3)
118 Keysight FieldFox Handheld Analyzers Service Guide