Question about Samsung SCX 4521F All-In-One Laser Printer
Hello check again properly.i think front cover is open
if you replace toner and didnt close front cover properly or you open it and didnt close properly.
Posted on Sep 09, 2010
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Posted on Jan 02, 2017
We had this problem. It turned out there was actually a piece of paper stuck in the printer! It wasn't so easy to see it from the rear.
We removed the paper from the front by taking out the ink cartridge first. Turned the printer back on and everything was fine.
Posted on Apr 06, 2009
SOURCE: doc cover open
Yes there is and I know your problem have a look at the left hinge on lid that you lift to put down an original for copying, it will be breaking apart, the switch is black in that same corner on doc feeder base, as the hinge breaks apart the doc feed lifts in that corner causing "doc cover open" cause that switch no longer gets pushed in when lid is shut
Dodgy repair - tape switch closed, but doc feeder will not work properly/can use glass.
Repair - Easy removal of three screws and replacing 20buck hinge bought from brother dealer...part no.LE8731001 Hinge assy left.
Now that's FIXYA!
Posted on Nov 19, 2007
Thank you Daniel - it worked for me!
I just spoke with a Brother Customer Service Rep. and he did not mention this potential fix. He ended up recommending a local service center, but suggested that it might be less expensive to purchase a new pinter instead.
Note to others: the tiny perpendicular appendage is on the (this thin black plastic)flap that you pull down to expose the orange roller. There was a separate black piece on the flap that was slightly bent & "jossled out of the slot" as Daniel mentions.
I hope this works for you as Daniel's advice above just saved me about $170 on a new printer - Thank you!
Posted on Apr 28, 2010
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