Question about Samsung SCX-4100 All-In-One Laser Printer

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Have lsu error also.

How does this happen?
What can I do to prevent occurrence?

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Hi ...

LSU stands for Laser Scanner Unit ... you normally get 2 different kind of errors with LSU ...
LSU Hsync or LSU Motor Error ...
If you get this error, it means that the Laser Scanner Unit has gone bad and the only way to get it fixed is to get the printer repaired ...

Cheers ....

Posted on Jul 29, 2009

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Had "LSU Hsync error".
I used a damp Qtip to clean the narrow slit on top of the toner, and the area on the cover above the toner, and that fixed it

Posted on Jan 13, 2015

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Printer doesnt print

Posted on Oct 02, 2009

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1 Answer

Lsu error,before that not this problem on my printer,just change new toner.got this problem


I would highly suspect a defective toner. What happens if you put the old toner back in - - do you get the same error? If you don't, then replace the toner. If you continue to get a lsu error, then your Laser Unit has a toner spill on the glass, or has gone bad and will need replaced.

Oct 17, 2013 | Xerox Phaser 3200MFP/N Laser Printer

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There's a colour lazer printer 510 in my office, but when, one day, i come to work, the printer screen displayed, PRINTER LSU ERROR. And what can i do about this? Please guide me. thank for your time and...


First just turn it off for ten minutes and then restart it,

There is a fault in the LSU unit.
1. Use EDC mode to test the HSYNC signal and LSU Motor.
2. Check the Harness connected to the Engine Controller and LSU.
2. Check the Harness connected to the Engine Controller and LSU. --> Refit the harness or replace it if it is damaged.
1. Use EDC mode to test the HSYNC signal and LSU Motor. 2. Check the Harness connected to the Engine Controller and LSU. --> Refit the harness or replace it if it is damaged.. 3. Replace the LSU

If the problem still happens call a repair tech.

Dec 01, 2010 | Office Equipment & Supplies

2 Answers

How to troubledhoot the LSU error on samsumg


repalce laser unit or check menu # 1931 lsu mirro test

Aug 03, 2010 | Samsung SCX 4521F All-In-One Laser Printer

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Engine LSU error printer model samsung ML2150


how can over come from LSU error problem in samsung all in one machines

Jan 21, 2010 | Samsung ML-2150 Laser Printer

1 Answer

LSU error code


Do you have the old cartridge? Because the message you are getting makes no sense if you can copy and not print.
The chip on the cartridge may be corrupting the machine software.
I will explaine why I say this. LSU fault, is a failure of the laser unit within the printer/copier. If it had failed, you should not be able to copy or print, The machine should not function. The laser unit is what makes the image on the drum. So neither print or copy should work if that was a true LSU code.
Did you purchase a cartridge made by another company other than Xerox? If so try returning it.
As I say, an LSU code should make the machine totally unpoerable, not partially functional.
I would try the old cartridge if you have it to see what happens.
Let me know if you have tried swapping cartridges and I will look into this more for you.

Sep 16, 2008 | Office Equipment & Supplies

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.

Jul 03, 2008 | Samsung SCX-4100 All-In-One Laser Printer

4 Answers

Lsu error


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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6 Answers

Samsung scx-4521 f


if it's a vertical line in scanned pictures, it's probably a dust bunny on the scanner head, if it's only on printed pages, it's probably a dust bunny on or in the laser assembly or between the laser and the photosensitive drum. if cleaning doesn't get rid of it, you could have a defective scanner head or laser assembly, or a scratch on the photosensitive drum.

Jun 27, 2006 | Samsung SCX 4521F All-In-One Laser Printer

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