S y s t e m m o t h e r b o a r d
LS/VS550 OWNER’S HANDBOOK 5/5
Fan Connectors, PL73 & PL74
Pins
CPU Fansink PL73
Pins
Main fan PL74
1
Ground
1
Ground
2
Fan Fail
2
Controlled supply
3
+ 12 volts
3
Ground
Front and panel connectors, PL70 & PL71
Row A - PL70
Pins
Row B - PL71
Power (PSU control)
1
Standby switch
Power return
2
Standby switch return
(Connected to pin 6)
3
Vcc
Keyed
4
Keyed
Hard disk LED signal
5
IRDA input
Hard disk LED pullup
6
Ground
Ground
7
IRDA output
Keylock switch
8
Ground
Keylock switch return
9
Not used
Power on LED signal
10
Not used
Power on LED return
11
Speaker out (BEEP)
Standby LED signal
12
Message LED signal
Standby LED return
13
Message LED pullup
Reset switch return
14
Not used
Reset switch
15
Not used
Front panel connector, PL20
Analogue ground
1
2
KEYED
No connection
3
4
No connection
No connection
5
6
No connection
Message LED (control 2)
7
8
No connection
Message LED (control 1)
9
10
5 V supply (fused)
IR transmit
11
12
RTS
IR receive
13
14
Digital ground