Question about Samsung SCX-4720F All-In-One Laser Printer

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LSU Error? I am getting LSU error and paper is jamming halfway out of the fuser and into the exit tray. How can I tell what is exactly the problem? I am wondering if it's the exit rollers, fuser, or LSU. Any help would be appreciated along with a source for parts. Thanks Chris

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Re: LSU Error?

I am get an error with this SAMSUNG SCX-4720F and the problem says.... OPEN HEAT ERROR please what is that?

my email is:: and
Matthew from Ghana

Posted on Jun 28, 2008

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Re: LSU Error?

You will need to replace the Laser unit (LSU),

Samsung part number JC59-00018B

and the web site to order the US$ 94.82 LSU

Posted on Nov 12, 2007

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1 Answer

Samsung SCX 4623F " Paper Jam Inside"

If you wish to get some details; check the site linked here. Pull up older posts.

Jul 05, 2016 | Printers & Copiers

1 Answer

Paper keeps jamming in fuser, inner door and tray, can firmware upgrade fix this, its a c534dn

A paper jam as you describe could be caused by the following:

The fuser is defective and causing the jam.
The tray has a problem and it is not picking up the paper properly which causes a timing problem that results in a jam.
A bad sensor is stopping the printer from being able to tell if the right size paper is being fed through the printer.

Try printing from the manual tray to eliminate a problem with the standard paper tray. If it still jams it is very possible that your fuser has an issue and will require replacement. Are there any errors in the error log?

Mar 14, 2011 | Lexmark C534N Printer

1 Answer

Wat is an LSU error on a phaser 3200 MFP

Change the toner cartridge , i have many units phaser3200 and this is one of the problem , but only if the toner cartridge is very old and many time refilled , if not , change the Laser unit .

  1. Remove a misfed document if the copier displays a message reading "Document Jam." Lift up the document feeder cover and turn the roller to remove an Exit Misfed document. Lower the document feeder back into place and feed the document through again. If the document is jammed on the Input side, open the cover and gently pull the misfed document to the right and out of the feeder.
  2. Pull out the paper tray and lift the tray to release it from the copier if the copier displays a message reading "Paper Jam O." Remove the jammed document, and open and close the side panel of the copier to clear the error message.
  3. Unplug the power cord and plug it back in again if the copier displays a message reading "Fuser Error, Open Heat Error, Heating Error and Overheat." If the problem persists, call for a service.
  4. Remove the toner cartridge and shake it from side to side if the copier displays a message reading "No Developer Cartridge." If this does not do the trick, you may need to replace the cartridge. Pull the release latch to open the side cover, and open the front cover. Twist the cartridge locking-lever upwards and remove the toner cartridge. Insert the new cartridge and lock the lever into place. Shut the front cover and the side cover.
  5. Power off the unit and power it on again if the copier displays a message reading "LSU Error." A problem has occurred with the Laser Scanning Unit. If the problem persists, call for a service.

Jan 04, 2011 | Xerox Phaser 3200MFP/N Laser Printer

2 Answers

242.13 paper jam error We cannot find any paper jammed in the paper


The paper jam error 242.13 can be caused by an actual paper jam in the printer but since you did not find any paper the next thing would be pickup rollers. The pickup rollers can become worn and if they don't grap the paper right it will not more from the tray. There is a sensor that tells the printer that the paper exiting the paper tray and to start the printing. If this sensor does not detect paper when it should be there it gives a "paper jam" error thinking the paper is jammed. Look at the top page of paper for 1 or 2 light gray marks. If you see them then the rollers are the problem. You can see the rollers if you turn the printer on its side and remove the paper tray. To test the pickup rollers you can take off the rubber rollers( they look like white rubber band) from the wheel and turn them inside out, this will work as a temp fix untill you can get them replaced. If you need them replaced we can provide them or you can call a local repair show. I hope this helps, if so please rate my solution.

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Over 21 years of computer and printer support/repair

Jun 18, 2009 | Lexmark T644 Laser Printer

1 Answer

13 Paper Jam - but there is no paper inside!

I have a long solution (possibly) to your issue:

Error 13 Paper Jam
  • Paper jams can occur in 3 places: Entry, registration and exit.
  • If the paper isn't picking up out of the paper tray, visually inspect the pickup roller. If it looks shiny, replace it. You should also replace the separation pad as they work together. On the 4L/4P/5P/6P the pickup roller has a plastic shaft that breaks. You'll have to replace the whole pickup assembly. This requires major disassembly of the printer. Check our printer repair kits for your model printer. If you don't see it listed, email us.
  • If you have an HP 4/4+/5 with an optional 500 sheet feeder that's jamming, check the balance knob adjustment. Center it with a full **** of paper for proper operation.
  • If the paper is jamming at registration or anywhere between pickup and exit it could be a number of things. Check the paper path for torn bits of paper or label residue. On the II/III series, remove the metal registration guide plate (2 screws) and check underneath it. If the pickup rollers are moderately worn, the paper will stop just short of the registration roller. On the 4L/4P/5P/6P remove the screw holding the oblique roller assembly (Inside front of printer) and pull out and inspect the assembly and the area under it. On the HP 4/4+/5 pivot up the metal plate and check underneath it. Check the roller assembly on the left side for torn scraps of paper (a flashlight or torch is necessary).
  • Make sure paper cassettes are firmly seated, corner tabs aren't bent. Some trays have lifting springs that could pop out if tray has been dropped.
  • On HP IIP/IIP+/IIIP printers if the paper scrunches up at the toner cartridge you'll need our Inside Accordion Jam Repair Kit.
  • Check your software settings in the program you are attempting to print from. Do you have the correct paper size specified? If you have a different paper size than what is in the tray, you'll get a paper jam.
  • Exit jams are frequently caused by exit sensors. These sensors are typically mounted on the fuser assembly or adjacent to it. They are plastic arms that block and unblock an optical sensor. The arms can get stuck or knocked out of place when clearing paper jams. The optical sensors can also get dirt blocking the photo cell. Clean the sensor and check for free movement and proper installation of the sensor arms.
  • On HP II/III series exit jams are mostly caused by worn gears. The best way to troubleshoot this is to defeat the door interlock (see door interlock photo on troubleshooting page). Press down on the arm on the top right of the fuser. Initiate a test page. While holding down the arm, press one of the metal cartridge detect switches just below the door interlock. Watch the movement of the gears. You will get a 51 error because the door is open. Recycle power to get rid of error. There is an arm gear on the lower right of the fuser that can shed teeth. There is also a 14 tooth gear below the large gear on top of the fuser. You can also manually rotate the large gear and check for binding or crunching. If that happens, then replace the 14 tooth gear. On the door, there are some delivery coupler gears that mate with the fuser and drive the exit roller. Check the gears for excessive wear. Replace if necessary. If the paper gets almost all the way out and jams, replace the exit roller or the exit roller assembly. If the error occurs after fuser replacement, check and see if the connector on the left of the fuser is properly mated with the one in the printer.
  • On HP IIP/IIP+/IIIP printers if the paper has accordion folds on the bottom and jams on exit, order our Top Output Accordion Jam Repair Kit.
  • On HP 4/4+/5 printers the most common cause of exit jams is the exit assembly. Order our 4/4+/5 Exit Jam Repair Kit. Exit jams in the fuser can be caused by a broken fuser drive gear or a broken gear on the fuser. Remove the fuser and check the gear inside the printer for broken teeth. Manually turn the gears on the fuser and check for smooth operation. Check the paper exit sensor arm for proper mounting and free movement.
  • Check to make sure the rear door is closed on the printer. Open doors can cause 13 paper jam indications.
  • On the 5L/6L check the registration sensor arm below the pickup roller. Also check the exit sensor arm (bottom center of the fuser). These arms frequently get stuck or dislodged clearing paper jams. On these printers, if you are experiencing frequent paper jams, order our 5L/6L Multi-Sheet/No Feed Repair Kit
All this comes from:

Good luck with it, I love the HP LaserJet 4 series of printers. I used to warm my coffee on the top of the fuser when I was doing large print jobs :-)

If this information helps, please give me a rating, thanks!


Apr 07, 2009 | HP LaserJet 4 plus Printer

1 Answer

Jamming halfway thru fuser


Jan 27, 2009 | Minolta CF2001 Copier

1 Answer

Installed new 084K18470. Error e2-3 will not clear.

E2-3 is paper jam at tray 3 check paper path as paper exits this tray.
-Carl, please let me know if this helps.

Jan 21, 2009 | Xerox Phaser 4500/YDX Printer

1 Answer

Code 200 Paper Jam Error

Hi Mike,

This error can be caused by many reasons, some of them are:

Caused by Paper Stuck Under the Second Transfer Roll

Sporadic or Intermittent 200 Paper Jams

"200 Paper Jam" Resulting from a Possibly Damaged Tray

"200 paper jam" When Attempting to Print from Tray 2

To troubleshoot this problem, please click the links with their respective causes.

Please rate it fixya if it was helpful.

Thank you

Dec 19, 2008 | Lexmark C750 Laser Printer

1 Answer

Lexmark X6570 printer - Cleared paper jam. No paper scraps visible anywhere in printer. Continue to get error message to clear paper jam and then press the "check" button. Does not reset. ...

Ok, the paper jam could be due to one of the following:
  • Check for paper in the paper tray
  • Check the size of the paper in the paper tray to see if it is the same as what the printer is set for.
  • Defective D-roller
  • Debris in the paper path
  • Gears not turning or broken gear
  • Defective paper tray
  • Broken input sensor flag
  • Defective input sensor board
  • Defective system cable 2
  • Defective system board
  • Exit Sensor flag (Fuser)
  • Exit Sensor board (Fuser)
  • System cable 1
First try a hard reset - unplug printer from power source, wait a minute and replug. If it still does not work, uninstall the driver, reboot PC and reinstall (or download latest version from

If there is no bit of paper or debris stuck in the rollers, it would indicate something more serious, and in need of servicing. If your machine is under warranty, I suggest you take it back to the shop and get it replaced.

If your warranty has run out, then you'll either have to get it serviced or buy a new printer (whichever works out cheaper for you)

Hope that helps!

Nov 11, 2008 | Printers & Copiers

2 Answers

Hp 4250 paper jam erro

Is it a new or refurbished fuser? Where exactly does it jam. By trays, registration or before fuser? Problem can be with various sections. Need to know more.

Feb 12, 2008 | HP LaserJet 4250dtn Printer

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