Acer Aspire X3990 Acer Aspire X3990 Desktop Service Guide - Page 91
ATX_ POWER: ATX 24-pin Power Connector, ATX12V: ATX 12V Power Connector, PS_ON, PWR OK
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ATX_ POWER: ATX 24-pin Power Connector Pin Signal Name 1 +3.3V 2 +3.3V 3 COM 4 +5V 5 COM 6 +5V 7 COM 8 PWR OK 9 +5VSB 10 +12V 11 +12V 12 +3.3V Pin Signal Name 13 +3.3V 14 -12V 15 COM 16 PS_ON 17 COM 18 COM 19 COM 20 -5V 21 +5V 22 +5V 23 +5V 24 COM ATX12V: ATX 12V Power Connector Pin Signal Name 1 Ground 2 Ground 3 +12V 4 +12V 83 Chapter 5