NEC Express5800/120Rd-2 Service Manual page 305

When connecting the SCSI cable to an optional SCSI controller, route the SCSI cable
connected to the SCSI connector on the system board close to the power supply unit.
Confirm that the SCSI cable does not cover the ventilation hole of
NOTE:
cooling fan of the power supply unit.
Cable connected to the SCSI backplane
25. Install the components you removed previously.
26. Make the setup according to "SCSI BIOS" in Chapter 3.
Removal
Remove the backup device in reverse order of the installation steps.
SCSI backplane
<Example of connecting the SCSI cable of a backup device
to the SCSI connector on the system board>
Disassembly and Reassembly 7-61
Do not cover the ventilating holes of
the cooling fan with any cable.
Power supply unit
Route the cable connected to the SCSI connector
on the system board close to the power supply unit.