HP LaserJet 4P

How to Identify and Fix Common Problems ?

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

Double printing can occur for several possible reasons including an improperly seated ink tank, a misaligned print head, and a dirty encoder stip.
If the print heads are vertically or horizontally misaligned, however, the printer may unintentionally print the same letters or characters side by side. You can readjust the print heads in Windows or from the printer`s control panel.
Dirty or misaligned print heads

Your printer may be printing fuzzy, blurry, or other faint text because of dirty print heads. All modern printers have a self-cleaning mode, which cleans the print heads, and additional internal equipment used in the printing process.

Duplex printing means that you can print on both sides of the paper with your printer either automatically or manually by turning the paper over after the first side has printed. To duplex print, your model will need to have the functionality built-in.
Usually a quick paper setting adjustment will clear up a ghosting issue right away. Run a cleaning – Most printers have a cleaning function built into the machine. Run this a couple of times to attempt to clear up the printing issue. Inspect the drum – Sometimes excess toner powder can stick to the drum.
What causes ghosting? The most likely culprit is either the imaging drum unit or the fuser unit, however humidity and the incorrect paper type can all play a role in ghosting. Ghosting is often caused by a malfunctioning imaging drum unit.
HP® is proud to offer both inkjet printers and laser printers that are capable of double-sided printing.
Click Start, click Control Panel, and then click Printers and Faxes. Right-click the printer icon ( ) for your HP product. Click Printing Preferences, and then click the Features tab. In the Paper Saving Options area, select Automatic from the Two-sided printing drop-down list.
Change Print Settings Windows

Select the printer you`d like to use, and select the Properties button. Under the Layout tab, you can choose the method you want under the Print on Both Sides section. By choosing None, the document will print single-sided.

The overlapping occurs when a text field is not wide enough for the text it contains, causing the text to automatically scroll below the first word. The second word is invisible on the electronic copy, but is visible when printed. To remedy this, you can expand the text field by dragging the handles on the field.
Ghosts can occur when leftover ink from a previous print run gets trapped in the nooks and crannies of your screen mesh, or when underexposed emulsion reacts with your screen cleaning chemicals.
Dirty or misaligned print heads

Your printer may be printing fuzzy, blurry, or other faint text because of dirty print heads. All modern printers have a self-cleaning mode, which cleans the print heads, and additional internal equipment used in the printing process.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

replace with new imaging unit error
ANSWER : samsung clp 365w firmware

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HP LaserJet 4P

Scanning and copying faint image
ANSWER : The scanning is done by light bouncing off of some mirrors. Could be dust on one of the mirrors. Try shining a light down into the scanner unit and look at the mirror that is visible and see if it has dust coating on the side that is light.

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HP LaserJet 4P

replace imaging drug
ANSWER : Open the top lid. Grab the handle in the middle of the drum and pull up.

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HP LaserJet 4P

image drum message
ANSWER : You don’t have to replace it until it wears enough to affect the print quality. You’ll get spots or stripes. Here you go on a free reset. If you read the thread, someone says the procedure also works on your model. http://www.fixyourownprinter.com/posts/33634

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HP LaserJet 4P

Samsung CLP-300 Image Ghosting
ANSWER : Hi there – did you resolve your issue? It exactly mirrors the issue with my Samsung CLP-310. Each print carries across to the subsequent print as a ghost/smeared image and I diagnosis has revealed the transfer belt (ITB) has smeared toner remaining post each print. I was therefore considering replacing the Transfer Belt, but fear it is not the issue as you found. Whatever should be removing the toner from the Transfer Belt post print, is not, and then I get smeared ghosting on subsequent prints of the last print. The only mitigation is to print 5 blank pages post print, then the ghosting/smearing reduces to nearly zero (proving that the toner is being removed partially at least)…. Any help gratefully received.

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HP LaserJet 4P

Laserjet 4250 print quality issue (see image)
ANSWER : It looks like a fuser problem. One way to prove it is with the half-stop test. Put a sheet in the drop down manual feed tray. Send a print job and watch the paper. When the end of it is about to enter the printer, open the lid and take out the toner cartridge. Look at the printed image. If it looks OK, then it is a fuser problem. If not, then it is a toner cartridge issue since it hasn’t gone through the fuser.

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HP LaserJet 4P

no image
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HP LaserJet 4P

reset toners and image drum life
ANSWER : They both have chips that need to be replaced. There are videos on YouTube that show how to refill the toners and how to replace the chips.

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HP LaserJet 4P