Keysight Technologies Option 503 Service Manual page 477

Assembly Replacement Procedures
RF Area (Options 543, 544, 550)
10.Refer to
Figure 16-58 Wire Harness Disconnect
N9030A PXA Signal Analyzer Service Guide
Figure 16-58. Disconnect the wire harness connector (1) located
between the switch and the frame. Remove the ribbon cable from the rear
of the top switch.
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