ASROCK A770DE User Manual page 25

D. MIC_RET and OUT_RET are for HD audio panel only. You don't
need to connect them for AC'97 audio panel.
E. Enter BIOS Setup Utility. Enter Advanced Settings, and then select
Chipset Configuration. Set the Front Panel Control option from
[Auto] to [Enabled].
System Panel Header
(9-pin PANEL1)
(see p.10 No. 23)
Chassis Speaker Header
(4-pin SPEAKER 1)
(see p.10 No. 17)
Chassis and Power Fan Connectors
(3-pin CHA_FAN1)
(see p.10 No. 19)
PWR_FAN_SPEED
(3-pin PWR_FAN1)
(see p.10 No. 35)
CPU Fan Connector
(4-pin CPU_FAN1) FAN_SPEED_CONTROL
CPU_FAN_SPEED
(see p.10 No. 5)
Though this motherboard provides 4-Pin CPU fan (Quiet Fan) support, the 3-Pin
CPU fan still can work successfully even without the fan speed control function.
If you plan to connect the 3-Pin CPU fan to the CPU fan connector on this
motherboard, please connect it to Pin 1-3.
ATX Power Connector
(24-pin ATXPWR1)
(see p.10 No. 8)
This header accommodates
PLED+
PLED-
PWRBTN#
several system front panel
GND
functions.
1
DUMMY
RESET#
GND
HDLED-
HDLED+
Please connect the chassis
1
speaker to this header.
SPEAKER
DUMMY
DUMMY
+5V
Please connect the fan cables
to the fan connectors and
match the black wire to the
GND
+12V
CHA_FAN_SPEED ground pin.
+12V
GND
Please connect the CPU fan
cable to this connector and
4
3
match the black wire to the
+12V
2
GND
1
ground pin.
Pin 1-3 Connected
3-Pin Fan Installation
Please connect an ATX power
12 24
supply to this connector.
1 13
2 5 2 5 2 5 2 5 2 5