Figure 1-24. Dc Power Distribution For The Midsize Computer - Dell OptiPlex GXa Service Manual

computer
power supply
internal
hard-disk drive
internal
hard-disk drive
3.5-inch
diskette drive
optional
drive
optional
drive
*
Some computers have an additional connector (P9) that may be used instead of P5 or P6.
1-30 Dell OptiPlex GXa and OptiPlex NX Systems Service Manual
keyboard
controller
power
management
and NIC logic
P1 POWER1
PWRGOOD
PSON# PSON#
+5 VFP +5 VFP
+5 VDC +5 VDC
–5 VDC –5 VDC
+12 VDC +12 VDC
–12 VDC –12 VDC
P7 POWER2
+3.3 VDC
main memory
P2 sockets
DIMM_A
P3
DIMM_B
DIMM_C
P4
*
P5
MICROPROCESSOR
+3.3 VDC
*
P6
core VCC +2.1 to +3.5 VDC

Figure 1-24. DC Power Distribution for the Midsize Computer

system board
+3 VDC
battery
RTC/
NVRAM
+5 VDC
–5 VDC
+12 VDC
–12 VDC
RISER
+12 VDC
FAN
+5 VFP
PANEL
+5 VDC
+5 VDC
USB
+5 VDC
KYBD
+5 VDC
MOUSE
processor
core regulator
riser board
+3.3 VDC
PCI1
+5 VDC
through
+12 VDC
PCI3
–12 VDC
+5 VFP
P1 (on EM
systems
+5 VDC
only)
ISA1
–5 VDC
through
+12 VDC
ISA3
–12 VDC
fuses (2)
NOTE: On EM systems,
+5VFP is routed to the inte-
grated NIC logic on the
system board and to P1 on
the riser board.