... functional check in specialized trade.The methods of operationa. Plug power supply 24PIN and P4, P6 or P8 into the ... voltage signal was not detected, or the detected voltage value over the normal, will issue a "DuDu" long buzzer; if ... SpecificationVoltage source : 20/24pin (ATX-connector)Voltage test : +12V,-12V,+5V,-5V,+3.3V,5V Stand by (SB) 12V power Good (PG)Connectors : Floppy, HDD, CDROM, SATA ...