HP LaserJet 4

How to Identify and Fix Common Problems ?

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

Open the access door, move the carriage if necessary, and then remove any jammed paper. On some Laserjet printers, you might need to remove the toner cartridge and/or imaging drum to access the paper jam. If your printer has a paper path cover behind the carriage, remove the cover, and then remove any jammed paper.
Once you have cut the paper, hold down the roll paper button for about 3 seconds. The paper feeds in reverse to a position where it can be easily removed from the sheet feeder at the back of the printer. If it does not feed to this position, repeat this step. Gently remove the paper.
Water Based vs Oil Based Inks – The Cleaning Process

Water based inks are simple: wipe off the excess ink with wiping canvas or with some newsprint, then just rinse with water. You may use a mild soap and lukewarm water. Dry thoroughly. If you are using oil based inks, first wipe off the ink with some paper or old rag.

Water Based vs Oil Based Inks – The Cleaning Process

Water based inks are simple: wipe off the excess ink with wiping canvas or with some newsprint, then just rinse with water. You may use a mild soap and lukewarm water. Dry thoroughly. If you are using oil based inks, first wipe off the ink with some paper or old rag.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

bits of paper stuck in rollers, how do i remove cover?
ANSWER : every model of printer is different so without knowing what type of printer it is nobody can tell you how to remove the cover without sounding like a smarty. Some sap on and others have multiple screws.

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HP LaserJet 4

error message that says " remove shipping lock from black cartridge" even though it has been removed
ANSWER : http://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c01760760

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HP LaserJet 4

Removing Cover on HP 900 series Deskjet
ANSWER : You can find here : http://www.fixyourownprinter.com/posts/59761

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HP LaserJet 4

"Printer's cover is open" Error
ANSWER : Maybe a different cover is open. Did you check the back cover.

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HP LaserJet 4

HP 4250, error 54.1 Remove sealing tape from toner
ANSWER : I am having the same problem as everyone else can someone send me a new link or the pdf

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HP LaserJet 4

removing toner/drum
ANSWER : Different model, same procedure https://www.youtube.com/watch?v=_qxKJSqFvAA

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HP LaserJet 4

How to remove printhead
ANSWER : That printer looks like it has a printhead that you need to disassemble the printer to remove. I’ve never seen a Canon printer that didn’t have a release lever.

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HP LaserJet 4

laser scanner assembly removal
ANSWER : You have to remove the cover on the right side of the printer. Then take the back panel off. Then remove the screws holding the top cover on, disconnect the arm on the right side of the top cover and then lift it off. The scanner assy. is on top, held in by 4 screws. and a couple of connectors.

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HP LaserJet 4