Acer Aspire X1920 Service Manual page 82

F_USB1~3: Front Panel USB headers
The motherboard has two USB ports installed on the rear edge I/O port array.Additionally, some computer
cases have USB ports at the front of the case. If youhave this kind of case, use auxiliary USB connector to
connect the front-mountedports to the motherboard.
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
SPDIF_OUT1: SPDIF out header
This is an optional header that provides an S/PDIF (Sony/Philips Digital Interface)output to digital multimedia
device through optical fiber or coaxial connector.
Pin Signal Name
1 SPDIF
2 +5VA
3 Key
4 GND
74
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
Function
SPDIF digital output
5V analog Power
No pin
Ground
Aspire AX1920 Service Guide