CroombeFP wrote: > I have an LiDE20 (which is virtually the same machine) and it worked > fine under FC3, FC4 and FC5. I think the clue is to have it connected to > your system when you install FC5. I also found it helps to have it on a > dedicated USB port rather than a port expander : quite why, I don't > know. Rick Stevens replied: > Often it's a speed issue. If you have a lot of stuff on a single USB > port, the bandwidth gets shared between all those devices and can cause > a problem. I've run into this with USB cameras, too. It can also be an (electrical) power issue: if I recall correctly, the LiDE20 is bus powered, which means that it doesn't have a separate power supply, but draws what it needs from the USB cable. Some USB hubs are "powered" hubs: they have their own power supply, and can supply plenty of juice to any peripherals. Others are unpowered. I don't have much experience with USB hubs -- the cheap unpowered one I have will power itself from the hub, and allow "downstream" devices to draw power through the hub from the computer. But that obviously means that I could have four power-hungry devices sucking power through a cable and port (on the computer) that's only expecting to power one, exceeding the USB specifications and the specifications of the motherboard. And a scanner is a relatively power-hungry device, even when it uses LEDs as a light source -- it still has to emit quite a lot of light at the same time as powering a motor. James. -- E-mail address: james | Please do not put sandwiches in the disk drive. @westexe.demon.co.uk |
