IBM 7026-H80 - RS/6000 - 256 MB RAM - Four-Character Checkpoints; Replacing the Primary Drawer Operator Panel; Replacing the Network Adapter; Analyzing SPCN Errors on Secondary Drawers

c. If the same hang occurs with the new diskettes, replace the following FRUs one
at a time in this order:
1) Diskette drive
2) I/O backplane in the primary I/O drawer
d. If this procedure does not fix the problem, call service support.
Chapter 4. Checkpoints 145