Document Number 2002
System Locks With Scanner Board Installed
5/15/93

Please note that the following problem does not occur with the
Logitech ScanMan Color.

Symptom:  After plugging the scanner board into a 486 computer
the system will not boot.  No video display comes up and the
system appears to be without power.  No memory check will
appear.  When the scanner board is removed, the system will boot
properly.

Solution:  The problem described above has been confirmed by the
engineers at Logitech.  We have found the problem to be caused
by the motherboard.  A batch of motherboards using the SIS
chipset were built with an incorrect value pull up resistor on
the DMA, which translates to an incompatibility with certain
hardware devices.

The problem has now been corrected by Free Computer
Technologies, a local motherboard manufacturer.  There is
currently a new revision of the motherboard available which does
not present the failure described above.  Logitech has been
working with Free Computer Technologies  to resolve this problem
and has verified that the problem is corrected.

Although this is the only manufacturer of motherboards with whom
we have been able to confirm the resolution, we have received
reports from customers throughout North America who have
received similar feedback from their motherboard manufacturers.

If your system displays these symptoms, and your motherboard
uses an SIS Chipset, then Logitech advises contacting the
manufacturer of your motherboard to see if they have a new
revision which will correct this problem.

If you have any questions or are unable to receive any
assistance from the manufacturer of your motherboard, please
contact Logitech at (510) 795-8100 during business hours or send
us a FAX at (510) 505-0978 and we will be more than happy to
look into the situation for you.