HP LaserJet 2420DN
I was unable to fix this problem with what I found on your site. The printed paper looks like it just keeps coping a certain spot of the print out and looks like mirror image down the left side of the paper. I have cleaned as best as I could all areas I could reach and replaced the ink cartridge. What can I do?

Experienced technical support provide their insights in answering this question :
I would suspect the fixing film has wear. You can prove the theory by doing a half-stop test. This stops the print before it enters the fixing film assembly. Load paper in the drop down MF tray in the front. Send a print job and when the tail end starts to enter, open the cartridge lid on top to stop it. Then remove the toner cartridge and look at the paper. If you see the marks, it is from the toner cartridge. If you don’t, it would be coming from the fixing film since the paper hasn’t entered it.

How to Identify and Fix Common printer Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced technical support :

Your HP LaserJet 2420 printer is designed to work with original HP 11X toner cartridges. Only original HP Q6511X toner cartridges can provide the results your printer was engineered to deliver.
“Reset the maintenance count” on an HP LaserJet 2420 or 2430

1. Turn the printer on; as it begins the memory count, press and hold the checkmark button (Select). 2. Continue holding the checkmark button until all the LED service lights are illuminated, and then release the checkmark button.

If you look at the back door cover of the printer there is a label that has your model number serial number and also includes the date of manufactuer. Hope this helps. If you look at the back door cover of the printer there is a label that has your model number serial number and also includes the date of manufactuer.
As print quality goes down over time, this will be a reason to replace the color printer. We find a black and white printer can sometimes last 10 years or more and most color laser printers are replaced every 3 to 5 years.
Find the product name, number, and serial number on the label on the printer. The label might be found inside the printer cartridge access area or on the back of the printer. For some older printers, it might also be found on the bottom of the printer.
A toner cartridge, also called laser toner, is the consumable component of a laser printer. Toner cartridges contain toner powder, a fine, dry mixture of plastic particles, carbon, and black or other coloring agents that make the actual image on the paper.
Turn on the printer, and then connect the USB cable to the printer and to the computer port. If a Found new hardware message displays, follow any prompts to install the printer. If you can print, the driver installed successfully. If you cannot print, continue with these steps to add the printer in Windows settings.
Select the Start button, then select Settings > Devices > Printers & scanners . Under Printers & scanners, look for your printer. If you see your printer listed, you`ll know it`s installed.
A good rule of thumb: if your printer is more than seven years old, you may want to start pricing new units. In this case, even a relatively inexpensive component is not worth the investment.
Inkjet printer cartridges are typically cheaper than laser printer cartridges, but toner (laser printer ink) tends to last longer. Laser printers are ideal if you tend to print mostly text-based documents because they can print text two or even three times faster than most inkjet printers.
Most HP serials begin with letters, have several numbers in the middle, and end with another group of letters. The year of manufacture will appear in the middle of the number as four consecutive digits. If you purchased your computer new, look for the year you purchased it.
The easiest way to find your printer model is by looking at the front of your printer. Depending on what printer you own, the model name could be on the corners or the center of the front-facing cover. If it is on the front of the machine, it is usually close to the control panel.
If you`re attempting to identify the printer manufacturer or model, this information is commonly found on the front, back, or bottom of the printer. In some cases, the printer`s identification may also be under the cover of the printer.
HP LaserJet printers use a laser beam and one (or more) toner cartridge to print directly without ink. Using laser toner cartridges, the typical laser printer can produce precision prints more quickly than ink. Unlike a laser printer, inkjet printing relies on liquid ink cartridges.
LaserJet as a brand name identifies the line of laser printers marketed by the American computer company Hewlett-Packard (HP). The HP LaserJet was the world`s first desktop laser printer.
The key parts of the printer include, toner cartridges, image drum (also known as drum unit or photo-conductor), transfer roller or belt, fuser unit, laser, and mirrors.
How a laser printer works. They work by using a heated wire to positively charge a drum, which is then passed over by a laser that reverses the charge in the areas that it hits. The now-negatively charged areas of the drum represents the image or text that is to be printed.
Laser printers are machines that melt toner powder onto paper to create a print. Laser printers are more expensive than inkjet printers upfront and uses pricier toner cartridges but is still a more economical option in the long run with its overall lower cost per page, faster print speeds.
At the basic level, printers work by converting digital images and text into physical copies. They do this using a driver or specialized software that has been designed to convert the file into a language that the printer can understand. The image or text is then recreated on the page using a series of minuscule dots.
In contrast to laser printing technology, inkjet printers use pigmented liquid ink which is directed into the print head, this then sprays droplets of ink through tiny nozzles onto the page. These microscopic droplets are precisely arranged to recreate images or text.
Select the Start button, then select Settings > Devices > Printers & scanners. Under Add printers & scanners, select Add a printer or scanner. Choose the printer you want, and then select Add Device.
Select Start > Settings . Go to Devices > Printers & scanners > select a printer > Manage. Then select Set as default. If you don`t see the Set as default option, the Let Windows manage my default printer option may be selected.
Printers are configured in the Printers section of the Windows Control Panel. Printer Settings: Displays the printer settings window associated with the selected printer. The desired paper size, among other settings, can be selected in the printer settings window.
Restart your printer by turning it off, waiting 10 seconds, and disconnecting the power cord from your printer. Then, turn off your computer. Connect the printer power cord to the printer and turn the printer back on.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Hp laserjet 2420dn
ANSWER : I would suspect the fixing film has wear. You can prove the theory by doing a half-stop test. This stops the print before it enters the fixing film assembly. Load paper in the drop down MF tray in the front. Send a print job and when the tail end starts to enter, open the cartridge lid on top to stop it. Then remove the toner cartridge and look at the paper. If you see the marks, it is from the toner cartridge. If you don’t, it would be coming from the fixing film since the paper hasn’t entered it.

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HP LaserJet 2420DN

Hp laserjet 2420dn
ANSWER : I was unable to fix this problem with the paper. It looks like it just keeps coping a certain spot of the print out and and looks like mirror image down the left side of the paper. I have cleaned as best as I could all areas I could reach and replaced the ink cartridge.

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HP LaserJet 2420DN

HP Laserjet 4200 50.2 Fuser error
ANSWER : if you are using a good fuser the next part to try would be low voltage power supply

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HP LaserJet 2420DN

HP Laserjet M3035xs RFU Upgrade
ANSWER : There’s no way.

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HP LaserJet 2420DN

HP laser jet 3015 "Upgrade Error Call HP Support"
ANSWER : rgtr

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HP LaserJet 2420DN

evenly spaced horizontal lines on hp laserjet III printout
ANSWER : The lines would be a toner cartridge problem. Which paper tray? The MF tray or the optional paper cassette?

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HP LaserJet 2420DN

HP Laserjet 4250 – RFU LOAD ERROR
ANSWER : Italiano:

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HP LaserJet 2420DN

How to copy a card slot in HP laserjet 4250N
ANSWER : None that I know of, using a computer is likely your best option but I never attempted it.

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HP LaserJet 2420DN