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From: Brendan R. Wehrung on 2 Aug 2007 23:26
Beno�t-Nicole Morrissette (benoitmorrissetteNO(a)SPAMhotmail.com) writes:
> On Fri, 20 Jul 2007 05:33:46 -0700, kimiraikkonen <kimiraikkonen85(a)gmail.com>
> wrote:
>
>>Hi,
>>
>>But nowadays, i'm receiving error "cannot communicate with scanner"
>>which is very common error about Canon's Twain driver.
> snip...
>>Regards.
>
> Replace your computer power supply with a beefier one.
>
> Many scannrs draws a lot of power and USB is limited to 500mA. As you add more
> gadgets on your computer, the less current is available. The same thing goes
> for aging power supplies. After adding a new video card in my computer, my
> CanoScan Lide 70 could not "communicate" anymore with my machine. After
> replacing my 300W power supply with a 550W one, it work well again!
>
> Replacing the USB cable with a high quality one might work too: the bigger the
> cable, the less resistive they are and the more current to the scanner you
> have...
>
> Beno�t-Nicole Morrissette


Generally printers "like" to be connected directly to the computer rather
than through a hub, but (with a good cable) wouldn't a powered high-speed
hub avoid the problem of "stolen" voltage?

Brendan
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