M550

{ Data from M550 manual ver5.6 }

M550 Mainboard

P1 - Power Supply Connectors
Pin Description Pin Description
1 Power Good 7 Ground
2 + 5V DC 8 Ground
3 + 12V DC 9 - 5V DC
4 - 12V DC 10 + 5V DC
5 Ground 11 + 5 V DC
6 Ground 12 + 5V DC

J1 - Keyboard Connector
Pin Description
1 Keyboard Clock
2 Keyboard Data
3 N.C.
4 Ground
5 + 5VDC

J3, J4 - Universal Serial Bus (USB) Connectors
J3 J4
Pin Description Pin Description
1 +5 VDC 1 +5 VDC
2 Data - 2 Data -
3 Data + 3 Data +
4 Ground 4 Ground

J7 (HDD-LED) - Hard Disk LED Connector
Pin Description
+ 5V
- Active Low

J7(RESET) - Reset Switch Connector
Setting Description
Open Normal Mode
Close Reset System

JP5-CMOS RAM
Internal Battery2-3
External Battery1-4
CMOS Clear3-4

J8(KB LOCK) - Keylock & Power LED Connector
Pin Description
1 LED Output
2 N.C.
3 Ground
4 Keylock
5 Ground

J8 (Speaker) - Speaker Connector
Pin Description
1 DATA Out
2 N.C.
3 Ground
4 + 5V

JP1, JP2 - DIMM Socket Voltage Selectors

JP3 - CPU External Clock Selectors

JP8A, B - CPU Internal Clock Speed Selectors

JP10 - CPU Type Selector

PS2 - PS/2 Mouse Connector
Pin Description
1 Mouse CLK
2 Ground
3 N.C.
4 Mouse Data
5 N.C.
6 N.C.
7 N.C.
8 +5VDC

JP7 - CPU Core Voltage Selectors

J7 (SUS-LED) - Susped LED
Pin Description
+ +5V
- Active Low

J7 (SUS-SW) - Suspend Switch
Pin Description
Open Normal Mode
Close Suspend Mode

Fan Power
Pin Description
1 +12V
2 Ground
3 Ground
4 +5V

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