sane-project-website/old-archive/1998-10/0116.html

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<!-- name="Andreas Czechanowski" -->
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<!-- subject="Re: Strage behavior (MFS-1200SP &amp; sane 0.73)" -->
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<title>sane-devel: Re: Strage behavior (MFS-1200SP &amp; sane 0.73)</title>
<h1>Re: Strage behavior (MFS-1200SP &amp; sane 0.73)</h1>
<b>Andreas Czechanowski</b> (<a href="mailto:m075@ins.uni-stuttgart.de"><i>m075@ins.uni-stuttgart.de</i></a>)<br>
<i>Thu, 8 Oct 1998 18:25:06 +0200 (METDST)</i>
<p>
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Hi Anthony !<br>
<p>
This is something else what distinguishes a good hardware implementation<br>
of a scanner from a lousy one:<br>
<p>
A good implementation should not allow moving beyond the end by either<br>
a hardware switch sensing the end-position and stopping the motor this<br>
way, or by a current limit or friction clutch that does not allow<br>
desctructive forces to take effect on the mechanical construction.<br>
Apart from this, there must be a software limitation in the firmware.<br>
<p>
You may try to insist on a case of warranty (I don't think that<br>
this case would have been absolutely avoidable  with their Windows<br>
software), or try to look yourself if you can find a sensor<br>
(mechanical or optical switch) that may have been in a different<br>
position before. (try to reconstruct the damage case with the<br>
scanner switched off and moving the scanning head manually).<br>
<p>
Good Luck !<br>
<p>
Andreas.<br>
<p>
On Thu, 8 Oct 1998, Anthony Mallet wrote:<br>
<p>
<i>&gt; Hi,</i><br>
<i>&gt; I'm experiencing a (very) strange behavior with my Mustek 1200SP (rev 1.06) </i><br>
<i>&gt; and sane 0.73 (under linux 2.1.117). I'm not sure if it is a software or a</i><br>
<i>&gt; hardware bug.</i><br>
<i>&gt; </i><br>
<i>&gt; First, everything was ok (cool, isn't it ;)</i><br>
<i>&gt; </i><br>
<i>&gt; Two days ago, I began a scan, and the head went too far away (though it</i><br>
<i>&gt; NEVER EVER did that before, and I did NOT CHANGE ANYTHING to my</i><br>
<i>&gt; box...). The mustek began to make frightening noise and I swtiched it off</i><br>
<i>&gt; immediately.</i><br>
<i>&gt; </i><br>
<i>&gt; Since that day, the scanning-head does NOT RETURN to the HOME POSITION</i><br>
<i>&gt; after a scan (but everything else is ok) and I must switch the mustek off</i><br>
<i>&gt; and on.</i><br>
<i>&gt; </i><br>
<i>&gt; So, it looks like a hardware bug since I did not change any software, but</i><br>
<i>&gt; I'm not sure there is a 'specialized' hardware in the scanner that only</i><br>
<i>&gt; controls the 'home return' of the head. I sent a mail to mustek-support</i><br>
<i>&gt; (europe) but they do not seem to answer it, so I'm a bit lost...</i><br>
<i>&gt; </i><br>
<i>&gt; If anyone has an idea...</i><br>
<i>&gt; 					Anthony</i><br>
<p>
<p>
<pre>
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</pre>
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<li> <b>Next message:</b> <a href="0117.html">bruno schwander: "Re: OS/2 ant sane 0.74"</a>
<li> <b>Previous message:</b> <a href="0115.html">Dr. Andreas Bolsch: "Re: Strage behavior (MFS-1200SP &amp; sane 0.73)"</a>
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