thank you, i have taken ur advice it was resett problem, now its working fine thanks once again. there is a brand new canon image class 2300 copier, there is message says PRINTER COVER OPEN" inspite of 2 swicthes in good working condition as well as i have resett printer this message dosent go nor the machine dosent work. i have changed the main PCB even then the error is same( the PBC below, on the base next to power supply board) what could be the reason? is it a manufactures defect? this machine is made in china brought from US. plz give a remedy for this thanks cherry.....

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