In SX Microcontrollers, SX/B Compiler and SX-Key Tool, George Herzog wrote:

Be very careful.  DO NOT CONNECT the INK JET PRINTER HEAD when checking with the LEDs.

The LEDs require much slower timing to be visible -- too much current for the printer head.  If the INK JET PRINTER HEAD is connected, it will suffer damage.  Since it is replacible, it is not serious -- just wasteful.  

I don't think it is possible to damage the controller board when using the installed software.

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