Question about Brother MFC 7420 All-In-One Laser Printer
I have opened the back door to see what the problem might be. there are two blue tabs and a yellow triangle sticker. I don't understand what the other repair folks are talking about---photo switches ---where are they? what do they look like? This all started because of a persistent black stripe on my faxes and when I copy. I also cannot fix that. I have replaced the drum once this year after getting 3 years out of the original. Do I need a new drum? I can't figure out what I am supposed to clean.
The black lines sound like it may be a contaminated fuser roller. Surface of one of these rollers is a Teflon coat. In time this wears away and the end result is toner build up that eventually transfers to the paper.A Photo Sensor is a switch that monitors the path of the paper thru the cycle of paper pick up all the way to exit of the paper from the out put. These switches open and close. when there is a paper jam and not all of the paper is removed fragments of the removed paper can be left behind. this can actually trigger an error of door open/close cover. The mentioned "two blue tabs" are the release point of the fuser upper roller that you toggle to move the roller up or release the downward pressure from the bottom roller. These are used to clear a paper jam . If you have access to a small flash light, look carefully in that area for fragments of paper. The "yellow triangle " is part of the warning label of the fuser cover stating that this is an extremely hot in temperature piece and to handle with care or touch with the power off and wait to cool prior to any inspection,. If there is no signs of fragments of paper in the area, a "sensor" flag might be stuck and blocking the photo sensor's light path, triggering the " Back Cover open" error.....hope this helps,Steve
Posted on Jan 28, 2008
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