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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1 Answer

LSU Error keeps showing


LSU stands for Laser Scanner Unit. Depending on the model this should come up only if the services used required scanning such as copy, fax sending, scanning.
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1 Answer

Error LSU


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.

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LSU indicates a laser problem.
What is the model number? I can give you more information with the proper model number.
Thanks.

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1 Answer

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LSU Error occurs when your printer printhead is damaged. Change your printer printhead, the printer will be ok.

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