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I'm having trouble with an erratic printer Pixma MP 980. Somtimes it prints (wireless connection) and other times it receives job but doesn't do it, saying there's a paper jam (error msg 5700 - turn off printer, get jammed paper out - there is no jam...

I am trying to print using back feeder. Error 5700 repeatedly shows, tells me to turn get jammed paper out (there isn't any) and to turn printer on and off and if that doesn't work, check manual.I don't have manual, and manual online didn't seem to h...