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Old 11-25-2010, 12:02 PM   #3
Shielder
Re: my printer inexplicably stopped working - is it broken?
On the side of the printer with the round air vent, there should be 2 small holes. The smaller one of these is a "Printer Engine Test" which bypasses the formatter unit (the bit that the print jobs get sent to and processed) and is supposed to test whether a 4000 is able to print at all.

If you get a long thin object (bent paperclip, pencil/pen nib, etc...) and insert it into the hole, it should press against a small switch which should eject a page with vertical lines on it. This should at least hopefully give you a slightly better clue as to what the problem might be, or at least eliminate that as being the problem.
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