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Article #2876

Re: Lexmark Z51 USB connection shows "UNKNOWN DEVICE"

#2876
From: David Lane
Date: Sun, 22 Aug 1999 00:00
50 lines
3034 bytes
On Sun, 22 Aug 1999 17:57:07 GMT, Ed <edlicc@my-deja.com> wrote:
>I have Win98SE and couldn't get the Z51 to work with USB.
>Went over everything with Lexmark support and he said it
>was Dell's problem. Dell didn't think it was their problem.
>The printer is recognized on USB but it can't communicate.
>I got a parallel cable and it works ok. Disappointing that
>USB didn't work. I don't think much of Lexmark dirvers.
>
>
>In article <7p8gu9$9jr$1@enterprise.cistron.net>,
>  "Rick" <mailme@cistron.nl> wrote:
>> A cousin of mine is trying to install a lexmark z51 printer. No
>matter what
>> we do we simply cannot get it installed. Everytime the usb connection
>shows
>> "unknown device". We tried everything looking for new drivers in every
>> corner of his PC but it fails over and over again.
>> The printer itself works on another PC so that is oke'. We even
>installed
>> the windows98 from the pc it worked on, on his pc. But the printer
>refuses
>> to work. The printer also refuses to work on the parallelport.
>> The "unknown device" runs on the following driver
>C:\Windows\INF\usb.inf
>> Does somebody has an idea what is wrong (USB is enabled in the
>BIOS) ????

Some of these USB problems are tricky. It is a new interface and
a few motherboards are not 100% percent compliant with the USB spec.
This is also true for some USB hubs. I can't guarantee that the Lexmark
USB hardware and firmware are perfect, but our test lab has verified it
using logic analyzers and a diverse collection of PCs. Reliable USB 
performance is a high priority for our products.

We did encounter a few motherboards and hubs that were out of spec.
When customers with these products call our tech support team, we try
to help them obtain updated motherboards and hubs. The tech support 
groups for some of these hardware vendors are not aware of USB failures
with their devices.

If you can provide the exact Dell model number and serial number of 
the computer that fails to work with a Z51, I will see if we have
a similar PC in a test lab.

I am not a member of our tech support team or our test lab. I work
in firmware development, but periodically interact with these teams.

-- 
==========================================================
David Lane                           Lexmark International
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References: <7p8gu9$9jr$1@enterprise.cistron.net> <7ppdlf$j3f$1@nnrp1.deja.com>

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From: dlane@miranda.lpdev.prtdev.lexmark.com (David Lane)
Subject: Re: Lexmark Z51 USB connection shows "UNKNOWN DEVICE"
Date: 1999/08/22
Message-ID: <37c0c447.0@usenet.lexmark.com>
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