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

["Phil Harris" <phillip.harris1@xxxxxxx>]

Yeah but this seems to be implying that the PSU will work in a wall socket
but not in an extension stripblock...

Phil

> -----Original Message-----
> From: Keith Doxey [mailto:ukha@xxxxxxx]
> Sent: 21 September 2001 20:44
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Re: OT USB Scanner stops working after a few
scans
>
>
> 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
> >
> >
> >
> > For more information: http://www.automatedhome.co.uk
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>
>
>
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