Dell OptiPlex Gs Service Manual (.pdf) - Page 27

DC Power Distribution for the Midsize Computer, riser board

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keyboard controller system board +3 VDC system power supply P1 PWRGOOD PSON# +5 VFP +5 VDC -5 VDC +12 VDC -12 VDC POWER1 power management logic RTC/ NVRAM battery PSON# +5 VFP +5 VDC -5 VDC +12 VDC -12 VDC RISER +5 VDC --5 VDC +12 VDC -12 VDC P7 +3.3 VDC POWER2 riser board +3.3 VDC +5 VDC +12 VDC -12 VDC PCI1- PCI3 +5 VDC -5 VDC +12 VDC -12 VDC ISA1- ISA3 internal P2 hard-disk drive internal P3 hard-disk drive P4 3.5-inch diskette drive P5 optional drive P6 optional drive +12 VDC FAN main memory sockets SIMM_A +5 VFP +5 VDC SIMM_B SIMM_C fuse +5 VDC SIMM_D +5 VDC MICROPROCESSOR processor core regulator +3.3 VDC core VCC +2.1 to +3.5 VDC PANEL KYBD MOUSE Figure 1-13. DC Power Distribution for the Midsize Computer System Overview 1-15

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System Overview
1-15
Figure 1-13.
DC Power Distribution for the Midsize Computer
–12 VDC
P7
+3.3 VDC
POWER1
system
power
supply
power man-
agement
logic
RTC/
NVRAM
+3.3 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–
ISA3
PCI1–
PCI3
MICROPROCESSOR
PANEL
KYBD
MOUSE
SIMM_A
SIMM_B
SIMM_C
SIMM_D
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
fuse
core VCC +2.1 to +3.5 VDC
+3.3 VDC