Motherboard Internal Connectors - JETWAY MM91 Series User Manual

2-2-2 Motherboard Internal Connectors

(1) ATXPWR (24-pin block): Main Power Connector
ATX Power Supply connector: This is a new defined 24-pins connector that usually
comes with ATX case. The ATX Power Supply allows using soft power on momentary
switch that connect from the front panel switch to 2-pins Power On jumper pole on the
motherboard.
on, the full power will not come into the system board until the front panel switch is
momentarily pressed.
board.
** We recommend that you use an ATX 12V Specification 2.0-compliant power supply
unit (PSU) with a minimum of 350W power rating. This type has 24-pin and 4-pin
power plugs.
** If you intend to use a PSU with 20-pin and 4-pin power plugs, make sure that the 20-
pin power plug can provide at least 15A on +12V and the power supply unit has a
minimum power rating of 350W. The system may become unstable or may not boot
up if the power is inadequate.
** If you are using a 20-pin power plug, please refer to Figure1 for power supply
connection. Power plug form power supply and power connectors from motherboard
both adopt key design to avoid mistake installation. You can insert the power plug into
the connector with ease only in the right direction. If the direction is wrong it is hard to
fit in and if you make the connection by force if is possible.
Figure1：20-pin power plug
When the power switch on the back of the ATX power supply turned
Press this switch again will turn off the power to the system
PIN ROW1
1
2
3
4
5
6
7
8
9
10
11
12
24-pin Main Power Connector
Figure 2：24-pin power plug
11
ROW2
+3.3V +3.3V
+3.3V -12V
GND GND
+5V Soft Power on
GND GND
+5V GND
GND GND
Power OK -5V
+5V Stand by +5V
+12V +5V
+12V +5V
+3.3V GND