Question about Dell 1600n All-In-One Laser Printer

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LSU ERROR shows in display panel

Printer is initialising properly, but when i scan / print something, it shows "LSU ERROR" When printing, the page comes out 1/2 way and then stops, and then LSU error is displayed.

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The LSU is the Laser Scanning Unit or "printhead". There is a mirror in there that spins really fast, if the mirror spins too slowly (bad motor, low voltage) it gives an error. Sounds like you would need a replacement LSU. Have the printer serviced.

Posted on Jan 14, 2008

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SOURCE: LSU ERROR shows in display panel

Call the ASC, the mainboard is malfuntion and need to be replace.

Posted on Jul 08, 2008

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1 Answer

Sir, i have a problems in my lexmark printer , while printing is it showing Lsu error. How it will be solved.


A problem in the LSU (laser scanning unit). Make sure all cables are properly connected to the printhead. If correct, replace the printhead.

For Further Assistance, please contact Lexmark Technical Support.

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LSU REFERS TO LASER SCANNING UNIT, PLEASE CLEAN THE GLASSES OF LSU, OR REPLACE THE SAME.

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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.
nevertheless if this is a continuous message you might need to check the connectors within the scanner which I advise an field call.

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The printer shows LSU error, When i Turn it of after 2 or more hour I can print max 3 copies and then the same error appier (LSU error).


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I have been offered a HP Colour Laserjet 3700dn to replace my faulty inkjet printer and have researched and found that it is the same as the HP Colour Laserjet 3700 i have been told that it boots up goes...


D is for Duplex. You can print at both sides of the paper. N is for Network. It means that your machine is equipped with a network Interface.
The display should say "READY" when finishing the initialisation process. Try connect a computer and see if it will print. There is a small pin hole at the left side cover. put something small inside that hole and press the hidden switch. That should start a "Engine Test". The printer will print a single page with horisontal lines. If the test page comes out perfect, it's probibly something wrong with your Operator Panel/Display. If you are thinking about replacing the panel/display, here's the part# RM1-0511-000CN

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LSU Error is showing the printer and is in non working condition

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12 Answers

LSU ERROR shows in display panel


The Laser Scanner Unit or LSU is what writes to the surface of the drum. The glass above the cartridge inside the machine could be dirty. The mirror motor in the LSU could be bad or needing cleaned so it spins better. Laser diode could be bad.

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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.

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