Question about Summagraphics SummaSketch III Graphic Tablet

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SummaSketch III has no power

After a year of being dismantled, I reassembled my pc, with Windows 98. Every component works well -- the monitors, the keyboard, the mouse. But the SummaSketch is not powering up. My program does not detect it, and the light on it does not illuminate. The connections seems fine, and it worked well the last time I used this computer. Is there any way to revive my SummaSketch? I cannot access my files/documents without its functioning. It was purchased around 1996 or '97. The Dell computer is from around 2000. Thanks for any tips or help!

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Absolutely, the Summasketch III needs a power pack, 12vdc which plugs into the RS232 plug (Computer side) Without this power supply plugged into the wall and into the cable the tablet will not work,

Try looking for a power supply at this URL:

or the one:


Posted on Oct 16, 2008



And just one more thing - there is likely to be a power switch along the top edge of the digitizer, as on my SummaSketch II Pro. It toggles the power - press it once to power up, press it again to power down. Good luck.

Posted on Aug 30, 2007


I have a SummaSketch II Professional. It connects to the computer's serial port. The serial connector has a piggy-back adaptor with a socket on it that accepts power input from a plugpack. Your SummaSketch III may require the same arrangement. If you don't have the plugpack connected your tablet will not be receiving any power, and that would explain why the power indicator lamp does not illuminate. Do a search on for details of the power requirement for you SummaSketch III.

Posted on Aug 29, 2007

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Posted on Jan 02, 2017

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