Acer Aspire M3920 Service Guide - Page 74

USBF1~4: Front Panel USB headers The motherboard supports eight USB ports on the rear panel and four USB ports on the front. The USB header pins description is as follows: Pin Signal Name 1 USBPWR 2 USBPWR 3 USB_FP_P0- 4 USB_FP_P1- 5 USB_FP_P0+ 6 USB_FP_P1+ 7 GND 8 GND 9 Key 10 USB_FP_OC0 Function Front Panel USB Power Front Panel USB Power USB Port 0 Negative Signal USB Port 1 Negative Signal USB Port 0 Positive Signal USB Port 1 Positive Signal Ground Ground No pin Overcurrent signal 66 Chapter 5