cannon ir 400 front switches board

[city2010]

how to open cannon ir 400 front swithes board plz reply as soon as possible

[D_L_P]

Do you mean the control panel?
Not exactly as easy as it should be. 3 screws in the front and 1 on top to take off the control panel. However to get to those 3 screws you have to take of the inner cover. To take of the inner cover you have to take out the drum, developer, transfer handle, fuser knob, front cover, and it helps to take out the top cassette.