System Board - Dell Dimension V400 Service Manual

+3.3
GND
PWRGOOD
+12 VDC
power +5 VDC
supply
–5 VDC
+5 VDC
GND
+5 VSB
PSON#
power
switch
P1
POWER
PSON#
GND
DIMMs
+3.3
BANK 0
GND
+3.3
BANK 1
GND
+3.3
BANK 2
GND
2.1–2.8-V
converter
+2.1–2.8 VDC
microprocessor
SEPP/SEC
+1.5 VDC
cartridge
GND
connector
(J4J1)
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P6
P7
3.3
GND
+5 VSB
GND
+5 VDC
–5 VDC
–12 VDC
+12 VDC
fuse
1.5-V
converter
fuse

system board

5.25-inch
drive
P2
5.25-inch
drive
P3
3.5-inch drives
(second drive
uses Y-cable)
P5
3.5-inch
diskette drive
P4
primary
hard-disk drive
secondary
hard-disk drive
(uses Y-cable)
battery
RTC
ISA
connectors
PCI
connectors
GND
KEYBD
+5 VDC
GND
MSE
+5 VDC
GND
+5 VDC USB0,
USB1
GND
FAN1
+12 VDC
System Overview 1-9