If it does, you will have to replace the cover or as I have done on occasion, super glued a small piece of plastic fashioned to the size of the tab. About the only way to test this if the tab is broken is to unplug the printer, put a piece of cardboard or some other material to push in the switch, close the door and apply power and see if the printer comes to ready. I have seen this tab break off or be bent to one side so the swtich is not activated when the door is closed. If you open the toner door, on the frame near the top a little to the right of center is a switch which is activated by a plastic tab on the toner door when it is closed. One thing i have seen on may occasions with this error is a tab broken on the toner door. It can be as simple as the plastic tab which activates the laser/scanner switch breaking off. Post it here and someone will tell you what is wrong. If all the lights come on and stay solid without blinking then you have a fatal error and pressing the big button will give you a secondary light pattern. The only way to correct this problem is with crazy glue. I seen cases where the plastic posts which hold the main board in the front of the machine break causing all sorts of problems. If it does not print, you have other problems. If it prints, the formatter is the problem. Press the button and see if you get a page to print with vertical lines.
Lift up the memory door in the back and a little to the right will be an engine test button. Real easy just remove the screws, lift up by the side and disconnect the connectors which go to the board.
Remove the formatter from the botton of the machine. It could be the formatter, but also be the main board or the way the main board is secured to the frame.
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