Acer Aspire X3990 Acer Aspire X3990 Desktop Service Guide - Page 90
Connecting Case Components
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Connecting Case Components CPU_FAN: CPU cooling FAN Power Connector Pin Signal Name 1 GND 2 +12V 3 Sense 4 Control Function System Ground Power +12V Sensor CPU FAN control SYS_FAN: System Cooling FAN Power Connector Pin Signal Name 1 GND 2 +12V 3 Sense 4 CONTROL Function System Ground Power +12V Sensor CONTROL Chapter 5 82