AOpen MX4LR-GN Datasheet

Case Open Connector
RJ45 10/100
LAN Jack
SPP/EPP/ECP Parallel Port
PS/2 Mouse
Connecto
r
MIC-In
Speaker
Out
Line-In
USB2.0
Ports
PS/2 Keyboard
Connecto
r
USB 2.0 Port
V
G
A
Port
COM 1 Port
CD-IN Connector
AUX-IN Connector
SYSFAN2 Connector
AC’97 CODEC COM2 Connector
Realtek RTL8101L LAN Chip 4-pin 12V. ATX Power Connector
Front Audio Connector
Resetable Fuse
JP28 Keyboard/Mouse Wakeup Jumper
Low ESR Capacitors
Game Port Connector
32-bit PCI Expansion Slot x3
FDC Connector
IrDA Connector 478-pin CPU socket (Willamette/Northwood) with
Voltage and Frequency Auto-detection that
supports Intel®Pentium®4 1.4~2.4GHz+ CPU
JP14 CMOS Clear Jumper
Intel 845GL Chipset
CPUFAN1 Connector
USB 2.0 Connector
SYSFAN3 Connector 184-pin DIMMx2 supports PC2100/2700 DDR
SDRAM maximum up to 2GB
Front Panel Connector
4Mb Flash ROM BIOS
ATX Power Connector
ATA 66/100 IDE Connector x2
PS. Here we use MX4LR-GN motherboard as illustration.

1. JP14 Clear CMOS
1
You can clear CMOS to restore system default setting. To
clear the CMOS, follow the procedure below.
1. Turn off the system and unplug the AC power.
2. Remove ATX power cable from connector PWR2.
3. Locate JP14 and short pins 2-3 for a few seconds.
4. Return JP14 to its normal setting by shorting pin 1 & pin 2.
5. Connect ATX power cable back to connector PWR2.
Everything you need to boot this
motherboard is included in this
Easy Installation Guide. For more
information, a complete Online
User's Manual can be found in the
Bonus Pack CD. Thanks for the
help of saving our earth.
Pin 1
Tip: When should I Clear CMOS?
1. Boot fails because of overclocking…
2. Forget password…
3. Troubleshooting…
1
Normal
(
default
)
Clear CMOS
Easy Installation Guide x1
80-wire IDE Cable x1
Floppy Disk Drive Cable x1
Registration Card x1
Bonus Pack CD x1
Retention Module x1
I/O Shield x1
EzRestore Guide x1
2. Connecting ATX Power Connector
This motherboard comes with a 20-pin and 4-pin ATX power connector as shown below. Make sure you
plug in the right direction. We strongly recommend you to insert the 4-pin connector before connecting
the 20-pin connector.
PART NO: 49.88U01.E02 DOC. NO: MX4LRGN-EG-E0302A

1. Pull up the CPU socket lever and up to
90-degree angle.
2. Locate Pin 1 in the socket and look for
a (golden) cut edge on the CPU upper
interface. Match Pin 1 and cut edge.
Then insert the CPU into the socket.
3. Press down the CPU socket lever and
finish CPU installation.
Plug in the CPU fan cable to the 3-pin CPUFAN1 connector. If you have chassis fan, you
can also plug it in SYSFAN2 or SYSFAN3 connector.
3. Installing Processor 5. Setting CPU Voltage & Frequency
CPU Ratio 8x, 10x… 21x, 22x, 23x, 24x
CPU FSB (By BIOS table) 100-255MHz.
MX4LR-GN(100MHz x 4)
CPU CPU Core
Frequency FSB Clock System Bus Ratio
Celeron 1.7G 1700MHz 100MHz 400MHz 17x
Celeron 1.8G 1800MHz 100MHz 400MHz 18x
Celeron 2.0G 2000MHz 100MHz 400MHz 20x
Pentium 4 1.6G 1600MHz 100MHz 400MHz 16x
Pentium 4 1.7G 1700MHz 100MHz 400MHz 17x
Pentium 4 1.8G 1800MHz 100MHz 400MHz 18x
Pentium 4 1.9G 1900MHz 100MHz 400MHz 19x
Pentium 4 2.0G 2000MHz 100MHz 400MHz 20x
Pentium 4 2.2G 2200MHz 100MHz 400MHz 22x
Pentium 4 2.4G 2400MHz 100MHz 400MHz 24x
MX4GVR-GN(133MHz x 4)
CPU CPU Core
Frequency FSB Clock System Bus Ratio
Pentium 4 2.4G 2400MHz 133MHz 533MHz 18x
Pentium 4 2.53G 2530MHz 133MHz 533MHz 19x
Pentium 4 2.66G 2660MHz 133MHz 533MHz 20x
Pentium 4 2.80G 2800MHz 133MHz 533MHz 21x
Pentium 4 3.06G 3060MHz 133MHz 533MHz 23x
Setting CPU Core Voltage
This motherboard supports CPU VID function. The CPU core voltage will be automatically
detected.
Setting CPU Frequency
This motherboard is CPU jumper-less design, you can set CPU frequency through the
BIOS setup, and no jumpers or switches are needed. The default setting is "table select
mode". You can adjust the FSB from "CPU Host/SDRAM/PCI Clock" for overclocking.
BIOS Setup > Frequency / Voltage Control > CPU Frequency Setup
Note: If you do not match the CPU
socket Pin 1 and CPU cut edge well,
you may damage the CPU.
Note: Some CPU fans
do not have sensor pin
so they cannot support
fan monitoring.
CPUFAN1 Connector
Warning: Intel®845GL
chipset supports
maximum 400MHz
(100MHz x 4) system
bus and 66MHz AGP
clock; Intel®845GV
chipset supports
maximum 533Hz
(133MHz x 4) system
bus and 66MHz AGP
clock, higher clock
setting may cause
serious system
damage.
4. Installing CPU & System Fan
SYSFAN2 Connector
CPU Pin 1 and cut edge
GND
+12V
SENSOR
GND
+12V
SENSOR
Note: Since the latest
processor, Northwood,
would detect the clock
ratio automatically, you
may not be able to
adjust the clock ratio in
BIOS manually.
GND
+12V
SENSOR
This socket supports FC-PGA2 package CPU, which is the latest CPU package developed
by Intel. Other forms of CPU package are impossible to be fitted in.
CPU socket lever
SYSFAN3 Connector

6. Support Six USB 2.0 Connectors
USB 2.0 Connector
Attach the power LED, speaker, and reset switch connectors to the corresponding pins. If
you enable “Suspend Mode” item in BIOS Setup, the ACPI & Power LED will keep
flashing while the system is in suspend mode.
Locate the power switch cable from your ATX housing. It is 2-pin female connector from
the housing front panel. Plug this connector to the soft-power switch connector marked
SPWR.1
Speaker
IDE LED
SPWR
ACPI & PWR
LED
Reset
ACPI LED
(
BLUE
)
1
5VSB
SPWR
ACPI LED-
GND
ACPILED
NC
ACPI_B
GND
RESET
GND
NC
NC
+5V
IDE LED
IDE LED
+5V
+5V
GND
NC
SPEAKER
9. Front Audio Connector
8. Connecting Front Panel Cable
This motherboard provides six USB 2.0 connectors to link USB devices, such as
mouse, keyboard, modem, printer, etc. There are four ports on the PC99 back panel.
You can use proper cable to connect other USB connectors to the back panel or front
p
anel of chassis.
1
+5V
SBD2-
SBD2+
GND
KEY
+5V
SBD3-
SBD3+
GND
NC
Pin1
USB 2.0 Connector
7. COM2 Connector
This motherboard provides two serial ports. One of them is on back panel connector, and
the other is on the upper middle of board. With proper cable, you can connect it to the
back panel of chassis.
If the housing has been designed with an audio port on the front panel, you’ll be able to
connect onboard audio to front panel through this connector. By the way, please remove
the jumper cap from the Front Audio Connector before you connect the cable. Do not
remove this yellow jumper cap if your housing doesn’t have an audio port on the front
panel.
Pin 1
Pi
n
1
GND
SOUT
DOD#
1
RI#
RTS#
1
2
AUD_MIC
AUD_MIC_BIAS
AUD_FPOUT_R
NC
AUD_FPOUT_L
AUD_GND
AUD_VCC
AUD_RET_R
KEY
AUD_RET_L
DSR#
CTS# SIN
DTR#
Front Audio Connector

12. Case Open Connector
10. JP28 Keyboard/Mouse Wakeup Jumper
The “CASE OPEN” header provides chassis intrusion-monitoring function. To make this
function works, you have to enable it in the system BIOS, connect this header to a sensor
somewhere on the chassis. So, whenever the sensor is triggered by lights or by the opening of
the chassis, the system will beep to inform you. Please be informed that this useful function
only applies to advanced chassis, you may purchase an extra sensor, attach it on your chassis,
and make a good use of this function.
This motherboard provides keyboard / mouse wake-up function. You can use JP28 to
enable or disable this function, which could resume your system from suspend mode with
keyboard or mouse installed. The factory default setting is set to “Disable”(1-2), and you
may enable this function by setting the jumper to 2-3.
Pin 1
Sensor
GND
1
1 1
JP28
KB/Mouse Wake-up Pin 1
Enable
Disable
(Default)
13. Support 10/100 Mbps LAN Onboard
On the strength of Realtek 8101L LAN controller on board, which is a highly-integrated
Platform LAN Connect device, it provides 10/100M bps Ethernet for office and home use, the
Ethernet RJ45 connector is located on top of USB connectors. The orange LED indicates the
link mode, it lights when linking to network. The green LED indicates the transfer mode, and it
lights when data is transferring. To enable or disable this function, you may simply adjust it
through BIOS.
The IrDA connector can be configured to support wireless infrared module, with this module
and application software such as Laplink or Windows 95 Direct Cable Connection, the user
can transfer files to or from laptops, notebooks, PDA devices and printers. This connector
supports HPSIR (115.2Kbps, 2 meters) and ASK-IR (56Kbps).
Install the infrared module onto the IrDA connector and enable the infrared function from
BIOS Setup, UART Mode, make sure to have the correct orientation when you plug in the
IrDA connector.
11. IrDA Connector
Green/Transfer Orange/Link
Pin 1
1
KEY
GND
IR_RX
NC
+5V
IR_TX
IrDA Connector