Our company sold Siemens LOGO BA07. That company make a program and downloaded toLogo. Everithingl looks right. After two months they send me a LOGO back with problem downloading to LOGO. I try download one input and one output everithings look very good a i send this LOGO back. But now i have the logo back and try download the biger program with this message from LSC.Transmission error (checksum Error). That gay who programing the logo show me somthing important, he open the box of logo and using shortcut something in mainboard. but i dont remember everithing what he say, becouse he was rought, ugly atc. I don't know why he must using this shorcut to erase program, but i thing he must change something in a LOGO becouse the checksum of LOGO is not a right. You can advace me what can i do with this situation.

Thnax.

P.S. My idea is send this pieace of hardware to service center in siemens.Maybe this man can chceck what is wrong in hardware of LOGO!