S y s t e m m o t h e r b o a r d
MS660 OWNER’S HANDBOOK 8/5
System Connectors
The following system connectors are used to connect various
features to the motherboard. You should not normally need to disturb
these connections but they may become dislodged during work inside
the system casing.
PL3
Pins
Pins
PL4
Power switch (PSU control)
1
1
Standby switch
return
2
2
Standby switch return
PL6
3
Vcc
(Connected to pin 6)
1
4
Keyed
Keyed
2
5
IRDA input
Hard disk LED signal
3
6
Ground
Hard disk LED return
4
7
IRDA output
Ground
5
8
Ground (speaker return)
Keylock switch
6
9
Not used
Keylock switch return
7
10
Not used
Power ON LED signal
8
11
Speaker out (BEEP)
Power ON LED return
9
12
Message LED
Standby LED signal
10
13
Message LED return
Standby LED return
11
PL7
Reset switch return
12
1
Not used
Reset switch
13
2
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
