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
64 Chapter 5 Removal and replacement procedures – Microtower (MT) chassis
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