BCM QS440VA User Manual download pdf (Page 22)

3. INSTALLATION

3.5.5 Front Panel connectors (J20-J26)

Front Panel includes headers for the following seven

I/O connectors:

Speaker, Reset Switch, Power LED, Hard drive

activity LED, Infrared (IrDA) port, Sleep Switch,

Power Switch. Please refer to the following figure.

Front Panel connectors:

Speaker Connector or Onboard Buzzer (J20, 4-pin)

It is used to drive a chassis-mounted speaker.

This header can select between the chassis

speaker and internal buzzer by installing a cap

over pin1&2. When the chassis mounted speaker

is needed the jumper should be removed.

Reset Switch Connector (J21, 2-pin)

This connector supports the front panel case-

mounted reset button. It is advised that the reset

switch be used for rebooting the system in order to

extend the life of the system’s power supply.

Speaker Reset Pwr LED HD LED IrDA Sleep Pwr

J20 J21 J22 J23 J24 J25 J26

Speaker J20

SpkrDat

Buzzer/Speaker Sel

Logic Ground

Reset J21

Ground

Reset

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BCM QS440VA User Manual Page 22