Keysight Technologies N5244/5B Service Manual page 615

Repair and Replacement Procedures
Removing and Replacing the A70 or A75 Low Frequency Extension (LFE) Board
5. Disconnect the 8121-2919 and N5245-60005 ribbon cables. Refer to
Figure 7-33 on page 7-75.
Figure 7-33 Disconnect Ribbon Cables from Rear Panel Connectors (8121-2919,
N5245-60005)
Keysight N5244B/45B Service Guide 7-75