IBM 8203-E4A Manual page 24

Note: When installing a new signal cable you can replace the control panel while the disk-drive
backplane is still outside the system. After you have replaced the control panel, replace the disk-drive
backplane as instructed in the Backplanes topic collection.
Related information
Exchange a part using the Hardware Management Console
Backplanes
16
Control panel, control panel fillers, and signal cables