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System Overview 1-31
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The OptiPlex NX1 computers have an 80-W computer power supply. The
power supply can operate from an AC power source of 115 VAC at 60 Hz or
230 VAC at 50 Hz. The system power supply provides the DC operating volt-
ages and currents listed in Table 1-5.
NOTE: The power supply produces DC voltages only under its loaded condi-
tion. Therefore, when you measure these voltages, the DC power input
connectors must be connected to their corresponding power input connectors
on the system board and hard-disk drive.
–12 VDC
power
management
and NIC logic
P7
+3.3 VDC
POWER1
system
power supply
RTC/
NVRAM
+3.3 VDC
+5 VDC
+5 VDC
+5 VDC
+5 VDC
+5 VFP
+12 VDC
–12 VDC
+5 VDC
–5 VDC
+12 VDC
–12 VDC
+5 VDC
–5 VDC
PSON#
+5 VFP
+5 VDC
–5 VDC
+12 VDC
PWRGOOD
PSON#
+5 VFP
+5 VDC
–5 VDC
+12 VDC
–12 VDC
+3 VDC
keyboard
controller
P3
+5 VDC
+12 VDC
–12 VDC
+12 VDC
3.5-inch
diskette drive
battery
P1
ISA1
through
ISA4
PCI1
through
PCI5
MICROPROCESSOR
PANEL
KYBD
MOUSE
DIMM_A
DIMM_B
main
memory
sockets
P4
FAN
RISER
internal
hard-disk drive
P2
optional
drive
P5
P6
riser board
system board
optional
drive
internal
hard-disk drive
processor
core regulator
POWER2
core VCC +2.1 to +3.5 VDC
USB
+3.3 VDC
P9
optional
drive
P1
+5 VFP
DIMM_C
NOTE: +5 VFP is routed to
the integrated NIC logic on
the system board and to P1
on the riser board.