Application note – Jameco Electronics 527822 User Manual
Page 30
APPLICATION NOTE
1. USB 2.0 DOCK normally derives its own power from PC Host. When system
power plugged in to the USB port of PC or notebook, the Large LED will turn
green, and the serial, parallel, keyboard, mouse, and 4 downstream ports can
operate without the switching adapter.
2. Please note that the 4 downstream ports may not function normally if no external
power applied and heavy power consumption USB device connected. An
external power will be highly recommended. You may use the external power
by connecting an external 5 voltage, 2A DC power that is UL, CE, T-mark or
locally approved. For Polarity, see the following:
3. Unknown Device:
If the installation process has been completed and some of the devices still don't
work, please go to: My Computer/Property/Device Manager/USB, check COM
port, printer, keyboard, mouse or Hub to see if “Unknown device” appears on the
screen. You need to “Remove” and “Refresh”, and start the installation processes
again. After trying the processes mentioned above and your device still cannot
work, please contact technical support at your local distributor.
USB 2.0 DOCK User’s Manual
- 29 -