NEC HX4600, User Manual

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1-20 System Overview
Factory-installed CD-ROM reader plus
three bays for removable media
drives.
Factory-installed 3 1/2-inch diskette
drive plus second bay for removable
3 1/2-inch drive.
(Exterior doors shown open)
Figure 1-10. Removable Media Drive Bays
On the upper right side of the system, below the LCD panel, are two built-in
3 1/2-inch bays. One contains a 3 1/2-inch diskette drive that supports both 720
KB and 1.44 MB media (see Figure 1-10).
Note: The SCSI termination resistors must be installed in
the last SCSI drive of the daisy chain cabling (bottom media
bay). All other devices must have terminators removed.
System Power
The system may be configured with up to three 560 Watt power supplies. Each
supply automatically switches between these input voltage ranges:
„
100-125 VAC at 50/60 Hz; 10.5 A maximum current
„
200-240 VAC at 50/60 Hz; 5.5 A maximum current
Each power supply provides DC outputs of +5 V, +12 V, +3.3 V, -5 V, and
-12 V. All output grounds connect to the power supply chassis and to earth
ground through the AC line cord. Each supply has:
„
Individual AC input line cord that plugs into the external side of the
power supply
„
Isolating device on each DC output so that the failure of one supply does
not affect the operation of the others
„
Cooling fan integral with each power supply enclosure. The fan circuit
implements fan failure detection.