Question about Samsung SCX 4521F All-In-One Laser Printer

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LSU ERROR MESSAGE ON little screen when photocopying

LSU message always appear on screen when photocopying

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The LSU error stands for Laser Scanner Unit error. The probable cause/s:

The Polygon motor in the LSU does not rotate.
The LSU’s laser beam is functioning properly.

What you can do:

Try to unplug the machine for a couple of minutes or maybe a little longer and then plug everything back in. Power on and then test.

Posted on Feb 09, 2010

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