IBM RT PC Options Installation page 85

3. If the drive is to be reinstalled in drive position C, set the adapter to the
side. It will be reinstalled in a later procedure.
4. Remove the cooling fan assembly. See "Cooling Fan Removal" on
page 2-6.
5. Disconnect P15 on the power cable from the 4-pin connector on the
rear of the fixed-disk drive in position E. Disconnect the ground wire
from the ground tab on the drive.
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Options Installation