Gigabyte GA-990FX - Onboard Buttons and Switch; Changing the Operational Amplifier

1-7 Onboard Buttons and Switch
Quick Buttons
This motherboard has 3 quick buttons: power button, reset button and clear CMOS button. The power button
and reset button allow users to quickly turn on/off or reset the computer in an open-case environment when
they want to change hardware components or conduct hardware testing. Use this button to clear the BIOS
congurationandresettheCMOSvaluestofactorydefaultswhenneeded.
PW_SW: Power Button
RST_SW: ResetButton
CMOS_SW: Clear CMOS Button
• Always turn off your computer and unplug the power cord from the power outlet before clearing
the CMOS values.
• NOTE:DonotusetheclearCMOSbuttonwhenthesystemison,orthesystemmayshutdown
and data loss or damage may occur.
• Aftersystemrestart,gotoBIOSSetuptoloadfactorydefaults(selectLoadOptimizedDefaults)or
manuallyconguretheBIOSsettings(refertoChapter2,"BIOSSetup,"forBIOScongurations).
Audio Gain Control Switch
This switch allows for audio gain control for the line-out jack on the back panel. Please make sure all of the
dipsaresetinthesamepositionandaresetaccordingtoyourheadphonespecication(actualeffectsmay
vary by the device being used).
F_USB30
F_U
B_ 
F_  F_ 

_
B
BS_
B
SB_
B
_S

S_
_
B
_U
_
B


 
S  
 
123
 
123
 
123
 
123
1
1
1
1
BSS
S
_S 
SSU
 
1 2 3  
 S3
BSSS
U
 __ 3
F_USB3F
S  _
S  _
S  _
SF


B_
F
_0
S
S
_0F
_F
_
_
__B


GainRatio
DIPSetting
DIP1 DIP2 DIP3 DIP4
2.5x
OFF OFF OFF OFF
6x
ON ON ON ON
1-8 ChangingtheOperationalAmplier
Step 1:
Use an IC extractor to carefully grip the IC's sides and extract it from
the socket.
Step 2:
Align the notch on your OP chip with the notch on the socket and gently
press the chip into the socket until seated.
For purchasing the IC extractor and OP Chip, please contact the local dealer.
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