hi i am vinoth. i have konicaminolta b211 photocopier machine. now it has problem with, (doc.cover open,close the doc.feeder cover.) but this machine doesn't have docuent feeder. only platen cover. if i run sacntest severel times, problem willbe solved. but after off/on problem come again. now i have replaced control pwb(mcu pwb). now problem solved. but i need to solve this problem from that mcu pwb. pls give me right instruction to solve this problem. my email id is vinoind@gmail.com.