System board callouts
Sys Bd Label
Sys Bd
Connector
Color
Component
Sys Bd Label
Sys Bd
Connector
Color
Component
CHFAN2
Chassis fan
connector
Red
Fan
SPKR
Speaker
connector
White
Speaker
HSENSE
Hood sensor
connector
White
Hood sensor
FRONT USB
Front I/O
connector
Yellow
Front I/O
PWRCPU
Processor
power
connector
White
4-pin processor
power
CMOS
CMOS button
Yellow
Reset CMOS
XU1
Processor
Green
Processor
(soldered on)
BAT
Battery
socket
Black
RTC battery
CPUFAN
Processor fan
connector
White
Processor fan
FRONT AUD
Front I/O
connector
Blue
Front I/O
DIMM4
DIMM4
(Channel A)
White
Memory module
X4PCIEXP
PCI Express
x16
downshifted
to x4
Black
Expansion card
DIMM3
DIMM3
(Channel A)
Black
Memory module
X1PCIEXP2
PCI Express x1 Black
Expansion card
70
Chapter 4 Removal and replacement procedures – Microtower (MT) chassis