ASRock H77TM-ITX manual Chassis Fan Connector

3W Audio AMP Output Wafer Header

(4-pin SPEAKER1) (see p.13/15/17, No. 28)

Front_R-

Front_R+

Front_L+

Front_L-

1

Please connect the chassis speaker to this header.

Power LED Header

(3-pin PLED1)

(see p.13/15/17, No. 11)

PLED-

PLED+

PLED+

1

Please connect the chassis power LED to this header to indicate system power status. The LED is on when the system is operating. The LED keeps blinking in S1/S3 state. The LED is off in S4 state or S5 state (power off).

Chassis Fan Connector

(4-pin CHA_FAN1) (see p.13/15/17, No. 4)

FAN_SPEED_CONTROL

FAN_SPEED

+12V GND

1 2 3 4

Please connect a fan cable to the fan connector and match the black wire to the ground pin.

CPU Fan Connectors

(4-pin CPU_FAN1) (see p.13/15/17, No. 22)

FAN_SPEED_CONTROL 4

FAN_SPEED3

+12V2

GND1

Though this motherboard provides a 4-Pin CPU fan (Quiet Fan) connector, 3-Pin CPU fans can still work even without fan speed control. If you plan to connect a 3-Pin CPU fan, please connect it to Pin 1-3.

Serial Port Header

(10-pin COM1)

(see p.13/15/17, No. 18)

COM PWR/DCD	DSR
RXD	RTS
TXD	CTS
DTR	COM PWR/RI
GND	NC
1

This COM1 header supports a serial port module.

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