Dell Precision 400 Service Manual (.pdf) - Page 25

Power Distribution

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keyboard controller system board +3.3 VDC system power supply P1 PWRGOOD PSON# +5 VFP +5 VDC -5 VDC +12 VDC -12 VDC POWER1 power management logic PSON# +5 VFP +5 VDC -5 VDC +12 VDC -12 VDC RTC/ NVRAM battery RISER +5 VDC -5 VDC +12 VDC -12 VDC riser board +5 VDC +12 VDC -12 VDC +5 VDC -5 VDC +12 VDC -12 VDC PCI1 through PCI5 ISA1, ISA2 P7 +3.3 VDC POWER2 +12 VDC FAN internal P2 hard-disk drive1 internal P3 hard-disk drive1 P4 3.5-inch diskette drive P5 optional drive P6 optional drive P9 optional drive 2 main memory sockets DIMM_A DIMM_B DIMM_C DIMM_D +5 VFP +5 VDC FUS +5 VDC FUS +5 VDC +5 VDC 2.5-V 1.5-V converter converter PANEL USB KYBD MOUSE SLOT1_PRI +1.8-2.8 VDC +2.5 VDC +1.5 VDC SLOT1_SEC +1.8-2.8 VDC +2.5 VDC +1.5 VDC processor core regulator 1 When a third SCSI hard-disk drive is installed (mini tower computers only), a Y-cable from P2 connects the first two devices and P3 connects the third SCSI hard-disk drive. 2 The third optional drive bay (5.25-inch) is available only in mini tower computers. Figure 1-10. Power Distribution System Overview 1-13

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System Overview
1-13
Figure 1-10.
Power Distribution
+5 VFP
–12 VDC
+12 VDC
–5 VDC
+5 VDC
PSON#
+1.5 VDC
P3
+5 VDC
+12 VDC
–12 VDC
+12 VDC
+12 VDC
–12 VDC
3.5-inch
diskette drive
system
power supply
PWRGOOD
PSON#
+5 VFP
+5 VDC
–5 VDC
+12 VDC
–12 VDC
power
management
logic
keyboard
controller
battery
+3.3 VDC
P1
POWER1
+5 VDC
–5 VDC
+12 VDC
–12 VDC
+5 VDC
–5 VDC
ISA1,
ISA2
PCI1
through
PCI5
SLOT1_PRI
+5 VDC
+5 VDC
+5 VDC
+5 VDC
PANEL
USB
KYBD
MOUSE
DIMM_A
DIMM_B
DIMM_C
DIMM_D
main memory
sockets
P4
FAN
RISER
internal
hard-disk drive
1
P2
optional
drive
P5
P6
+5 VFP
RTC/
NVRAM
P7
+3.3 VDC
riser board
system board
optional
drive
internal
hard-disk drive
1
POWER2
processor
core regulator
+1.8–2.8 VDC
+2.5 VDC
FUS
FUS
2.5-V
converter
1.5-V
converter
+1.5 VDC
SLOT1_SEC
+1.8–2.8 VDC
+2.5 VDC
P9
optional
drive
2
1
When a third SCSI hard-disk drive is installed (mini tower computers only), a Y-cable from
P2 connects the first two devices and P3 connects the third SCSI hard-disk drive.
2
The third optional drive bay (5.25-inch) is available only in mini tower computers.