Tevion MD90092 flat bed scanner, started to analyze

Hello to everyone,

I bought a TEVION MD90092 flatbed scanner at ALDI Sued two
weeks ago. Since no 
support for Linux is included, I started to write a backend
derived from the 
mustek_usb2.

My Email with  information request to the www.MEDION.de
support was 
automatically answered with a not helpfull FAQ list, and
since then I wait 
for a further answer. (The hope dies at last).  

With the USBsniffer under Windows XP I found out, that there
is a lot of data 
traffic to the scanner beforer the slider moves at all. 
NOTE: A newer DbgViewer.exe can be downloaded at microsoft ,
which supports 
also XP.

However the USB trace with these tools is incomplete, data
gets lost. -> so I 
will have to change the USBsniffer as well - OR -
Who could send me a tool for complete USB traces?

Now I found out, that the SQ113 chip revision has been
updated and that 
additional registers are used , which are not documented in
the mustek_usb2 
sources.
The bank switching register has not been addressed on my
traces so far.

I now screwed the device up (be carefull with the flat
ribbon cable) and found
an AMtek motor controller AMM56219 and a SQ100A2 as frontend
toward the 
sensor. 
The SQ100A2 is presumably a service & quality made A/D
converter, but the 
homepage http:\www.sq.tw.com  is mostly in Taiwanese and I
find no 
documentation.

Can there please somebody help me with datasheets of SQ100A2
and SQ113A3.1, 
associated programmer manuals  and some explanation, what
all is done before 
the motor moves?

Now after approx. 30 working hours, this seems a very big
job, which I can 
only continue after receiving some valuable hints.

Yours sincerely
Jochen

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Le mardi 3 avril 2007, Jochen Lauber a écrit :
> Hello to everyone,
>
> I bought a TEVION MD90092 flatbed scanner at ALDI Sued
two weeks ago. Since
> no support for Linux is included, I started to write a
backend derived from
> the mustek_usb2.
>
> My Email with  information request to the www.MEDION.de
support was
> automatically answered with a not helpfull FAQ list,
and since then I wait
> for a further answer. (The hope dies at last).
>
> With the USBsniffer under Windows XP I found out, that
there is a lot of
> data traffic to the scanner beforer the slider moves at
all.
	There is usually quite a lot of activity before scanning.
Things like 
verifying that scanning head is at home, doing a scan to
locate geometric 
patterns 'under the roof' to compute physical scan area
start, sensor 
calibration (offsets, gains and shading) are done before the
effective scan.
	Also constant button polling may end up filling logs.

> NOTE: A newer DbgViewer.exe can be downloaded at
microsoft , which supports
> also XP.
>
> However the USB trace with these tools is incomplete,
data gets lost. -> so
> I will have to change the USBsniffer as well - OR -
> Who could send me a tool for complete USB traces?
>
	I have satisfying results with the usbsniff program. I have
mirrored the 
latest version at
http//stef.dev.free.fr/sane/outils/index.html  .
	There some awk/perl scripts that turn produced logs in more
compact forms. 
They usually discard scanned data, which I think is a
drawback. In case you 
want, I can send or post my own version of the 'parse1.awk'
script which keep 
everything it can.

Regards,
	Stef



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