RE: Re: OT USB Scanner stops working after a few scans

["Keith Doxey" <ukha@xxxxxxx>]

USB has current limiting to prevent damage to the host PC.

If you are just plugging one device in it will be fine but multiple devices
could overload the supply. A reboot clears it because the overload clears
for long enough to reset the trip.

Best to use its own PSU if possible

Keith

> -----Original Message-----
> From: paul.murgatroyd@xxxxxxx
> [mailto:paul.murgatroyd@xxxxxxx]
> Sent: 21 September 2001 13:39
> To: ukha_d@xxxxxxx
> Subject: [ukha_d] Re: OT USB Scanner stops working after a few scans
>
>
> No Phil,
>
> I kid you not..
>
> >From http://www.umax.co.uk/support/faqs/usb.htm
>
> USB - Problems Caused by Low Power
> Problems of "scanner not found" or quit/crash during scans
can be
> caused by an excessive power load on the USB ports - make sure that
> all USB devices with external power supplies are switched ON (to
> prevent them drawing power from the bus). If some devices are self-
> powered (ie no external power supply) you may need a "powered USB
> hub". In some cases the problems are caused by a tiny power drain
> which can be fixed by plugging the scanner's external power supply
> directly in to a wall socket.
>
>
>
> --- In ukha_d@y..., "Phil Harris"
<phillip.harris1@v...> wrote:
> >
> > > 1. Make sure that the scanner is plugged in to its own power
> source,
> > > if possible try directly plugging it into the mains,
according
> the
> > > UMAX website, the power loss between the plug and the four
gang
> block
> > > can be enough to do it.
> >
> > This *HAS* to be a wind up by UMAX?
> >
> > Phil
>
>
>
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