Epson Equity 286 PLUS - Manual (Page 176)

6. Locate the hard disk drive ribbon cable that you removed
from the drive in the vertical mounting position. Follow the
instructions below to attach the connector on the end of
this cable to the drive that will be mounted vertically.
As shown below, there are two rows of holes in the
connector. One of the holes is blocked with a plastic plug.
7. Pick up the hard disk drive that you removed from the
vertical mounting position. Notice the ribbon cable socket
on the back of the drive; you see two rows of pins. In one of
the rows, a pin is missing.
missing pin
Installing and
Removing Disk Drives
B-37