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2-6 Dell Dimension 900 System Reference and Troubleshooting Guide
System Board
Figure 2-4 shows the system board connectors and sockets, and Table 2-1 describes
their functions.
Figure 2-4. System Board Features
processor fan
connector (FN1)
USB port
connector (CN6)
DC main power input
connector (CN2)
power button connector (JP1)
audio signal cable
connector (CN13)
DIMM sockets (DIMMn)
diskette-drive interface connector (CN16)
keyboard (lower)
and mouse (upper)
connectors (CN1)
secondary IDE interface
connector (CN7)
battery socket (BT1)
parallel port, video,
and serial port
connectors (CN3)
primary IDE interface
connector (CN8)
front audio/USB board interface
connector (CN12)
processor
mode jumper (JPX1)
NVRAM jumper (JPX2)
line-out
connector (PH1)
microprocessor
socket (U9)
riser-board
connector (SL1)
USB port
connector (CN5)
headphone
connector (CN5)
microphone
connector (CN5)
power-button indicator
connector (JP2)
hard-disk drive activity
indicator connector (JP3)
boot-block
select jumper (JP7)
password
jumper (JP6)
system board power
indicator (LED1)
front audio/USB
board audio signal
cable connector
(CN4)
jumper (not used)