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help for willem pcb 50b

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http://forum.allaboutcircuits.com – Hello everyone I contact you because I use a willem programmer 50b and I use the 12v but I do not know if the jumpers are set or not? because when I use it for programming 27c400 it strikes me that the EPROM is not empty when I erase with my uv eraser http://www.mediafire.com/view/fqq9q2...4_13.57.02.jpg http://www.mediafire.com/view/nbgc3p...4_13.57.15.jpg http://www.mediafire.com/view/sz6h32...4_13.57.33.jpg sorry if I write bad I'm french (Embedded)