J18: Front Bezel Connectors - TMC TI7NBA User Manual

5.15 J18: Front Bezel Connectors

The front bezel of the case has a control panel, which provides light
indication of the computer activities and switches to change the computer
status. J18 is a 20-pin header that provides interfaces for the following
functions.
Hard Disk Drive LED
Turbo LED Connector
SMI / Hardware Switch
Speaker
Speaker: Pins 1 - 4
This connector provides an interface to a speaker for audio
tone generation. An 8-ohm speaker is recommended.
Power LED and Keylock: Pins 11 - 15
The power LED indicates the status of the main power
switch. The keylock switch, when closed, will disable the
keyboard function.
TI7NBA Socket 370 ATX Motherboard User's Manual
Chapter 5 Installation
Reset Switch
ATX Power On Switch
Power LED and Keylock
Pin # Signal Name
1 Speaker out
2 No connect
3 Ground
4 +5V
Pin # Signal Name
11 Power LED
12 No connect
13 Ground
14 Keylock
15 Ground
25