Asrock 775twins-hdtv r2.0 User Manual

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USB 2.0 Header

HD 8CH I/O accommo-

(9-pin USB45)

dates 4 default USB 2.0 ports. If

(see p.9 No. 20)

those USB 2.0 ports on the I/O
panel are not sufficient, this
USB 2.0 header is available to
support 2 additional USB 2.0
ports.

Infrared Module Header

This header supports an

(5-pin IR1)

optional wireless transmitting

(see p.9 No. 25)

and receiving infrared module.

Internal Audio Connectors

This connector allows you

(4-pin CD1)

to receive stereo audio input

(CD1: see p.9 No. 29)

from sound sources such as
a CD-ROM, DVD-ROM, TV
tuner card, or MPEG card.

Front Panel Audio Header

This is an interface for front

(9-pin HD_AUDIO1)

panel audio cable that allows

(see p.9 No. 27)

convenient connection and
control of audio devices.

USB_PWR

P+5

P-5

P+4

P-4

GND

DUMMY

CD-R

GND

CD-L

CD1

IRTX

IRRX

GND

+5VSB

DUMMY

J_SENSE

OUT2_L

MIC_RET

PRESENCE#

GND

OUT2_R

MIC2_R

MIC2_L

OUT_RET

1. High Definition Audio supports Jack Sensing, but the panel wire on the

chassis must support HDA to function correctly. Please follow the
instruction in our manual and chassis manual to install your system.

2. If you use AC’97 audio panel, please install it to the front panel audio
header as below:
A. Connect Mic_IN (MIC) to MIC2_L.
B. Connect Audio_R (RIN) to OUT2_R and Audio_L (LIN) to OUT2_L.
C. MIC_RET and OUT_RET are for HD audio panel only. You don’t
need to connect them for AC’97 audio panel.
D. Enter BIOS Setup Utility. Enter Advanced Settings, and then select

Chipset Configuration. Set the Front Panel Control option from
[Auto] to [Enabled].
E. Enter Windows system. Click the icon on the lower right hand
taskbar to enter Realtek HD Audio Manager. Click “Audio I/O”, select
“Connector Settings”

, choose “Disable front panel jack

detection”, and save the change by clicking “OK”.