Wacom Graphire - 2 for Macintosh 사용자 설명서

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2.
Check the pen.
  Move your Graphire2 Pen across the active area of the tablet; the screen cursor 
should move in the corresponding direction on your monitor.  Press the pen tip against the tablet 
surface.  The status LED on the tablet should turn from orange to green.  Now, without applying 
pressure to the pen tip, press the side switch.  The status LED should again change from orange to 
green.  Turn the pen over and press the eraser against the surface of the tablet; the status LED should 
change from orange to green.  If not, you may have a defective pen or tablet.  See 
Verifying Your Macintosh is USB Ready
If the tablet LED does not light, your computer may not have the necessary USB software installed, or may 
not be configured properly.
If you added a USB interface card you must also install system software to support the USB card.  
Otherwise, if your computer came from the factory with a USB port installed, it should be USB ready.
Plug in another USB device to verify that the USB port is functional.