SOYO SY-P4X400 User Manual
Page 11
SY-P4X400 DRAGON Lite Quick Start Guide
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Power On/Off: PWRBT
Connect your power switch to this header (momentary switch type).
To turn off the system, press this switch and hold down for longer than 4 seconds.
ATX 12V Power Supply: ATX PW
Attach the ATX 12V Power cable to three connector. (This motherboard requires an ATX 12V power supply, an AT and ATX
power supply can NOT be used.)
When using the Power-On by PS/2 Keyboard function, please make sure the ATX power supply is able to provide at least
720mA on the 5V Standby lead (5VSB).
PS. Power supply must be use ATX 12V specification.
A new superset of the original ATX power supply is now defined. Named “ATX 12V,” this new power
supply is comprised of a standard ATX unit plus the following enhancements:
Increased +12 VDC output capability. Mother board components with unique voltage
requirements are increasingly expected to be powered via DC/DC converters off the +12 VDC
power supply output. This trend is due primarily to the higher power conversion and transmission
efficiencies of +12 VDC relative to +5 VDC or +3.3 VDC. ATX12V power supplies should be
designed to accommodate these increased +12 VDC current requirements and to address
associated issues such as cross-regulation, capacitive loading, transient surge tolerance, cable
voltage drop, and cooling.
New +12 V power connector. To enable the delivery of more +12 VDC current to the
motherboard, a new 4-pin receptacle/header combination--the + 12 V power connector–has
been defined. The presence of the +12 V power connector indicates that a power supply
is ATX12V; the absence of the +12 V power connector indicates that a supply is ATX.
CMOS Clear (JP5)
In some cases the CMOS memory may contain wrong data, follow the steps below to clear the CMOS
memory.
1.
Clear the CMOS memory by momentarily shorting pin 2-3 on jumper JP5. Its white colored cap
can easily identify this jumper.
2.
Then put the jumper back to 1-2 to allow writing of new data into the CMOS memory.
CMOS Clearing
Clear CMOS Data
Retain CMOS Data
JP5 Setting
Short pin 2-3 for
at least 5 seconds to
clear the CMOS
Short pin 1-2 to
retain new settings
Note: You must unplug the ATX power cable from the ATX power connector when
performing the CMOS Clear operation.
1 2 3
1 2 3