IBM PC 300, Maintenance Service Manual

Page: 125 / 163

125
J19: Front Panel USB Port (Optional)
Pin No. Function
1,4,5,10
NC
2
+5V
3,7,9
GND
6
USB P0+
8
USB P0-
JP18: SPDIF (Optional)
Pin No. Function
1 VCC
2 SPDIF OUT
3 GND
JP19: USB Device Wake up
Pin No. Function
1-2 close Disable USB Device Wake up (Default).
2-3 close Enable USB Device Wake up.
JP20/JP21: Quad Speaker (Optional)
Pin No. Function
1-2 close LINE_IN
2-3 close QUAD OUT
JP24: FWH Write Protection
Pin No. Function
Open Normal (Default)
Close Write Protection.
J12: For 2X11 Pins Jumper
Soft PWR: Soft Power Connector
Open: Normal Operation
Short: Power On/Off
RES: Reset Switch
Open: Normal Operation
Short: For Hardware Reset System
J12
PWR
P+P
−
P
−
HD
RES
SPKR
GN
GD
1
1 1
1