HP LaserJet 4

How to Identify and Fix Common Problems ?

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

Paper jams can occur for a variety of reasons, such as overloading the paper tray, loading different thicknesses of paper in the tray, or using paper that isn`t appropriate for your particular printer.
A piece of paper stuck in the paper tray or inside the printer can create a paper jam. Paper jams can occur for a variety of reasons, such as overloading the paper tray, loading different thicknesses of paper in the tray, or using paper that isn`t appropriate for your particular printer.
Dust, paper fiber, and other debris might accumulate on the paper feed rollers and cause paper jams and paper feed issues. Clean the rollers inside the printer, and then try to print again. Turn off the printer, and then disconnect the power cord.
Low-quality paper leaves an accumulation of tiny paper bits often referred to as “paper dust” inside the machine. This “dust” is one of the top causes of paper jams. More dust means more jams. Besides jams, the dust also contributes to poor-quality prints and causes machine parts to wear at a faster rate.
With the printer turned on, disconnect the power cord from the rear of the printer and also unplug the power cord from the wall outlet. Remove USB cable, if present. Wait for 2-3 minutes, press and hold the power button on your printer for about 30 seconds to remove any additional charge.
From the control panel go to : setup menu>printer maintenance and then select either cold reset or factory reset. cold reset: Resets printer to out-of-box condition, startup questions like self or IT managed will appear are initial prompts again.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Paper Jam and carriage jam code when nothing is jammed
ANSWER : Did you try cleaning the encoder strip that runs through the cartridge assy.? Use Window Cleaner on a paper towel. Also, check inside on the right. I’ve seen a lot of times where there is a folded up scrap of paper that stops the carriage from going all the way to the right.

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HP LaserJet 4

hp 8600 pro when power on, paper jam message appear but there is no paper jam in the tray
ANSWER : Hp 8180 Photosmart All In One code keeps says paper jam and carriage jam when neither are jammed. I followed all the recommended things to do. I live in Raleigh NC any place to take this or any suggestion.

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HP LaserJet 4

What repair needs to be done for a "50 needs repair" message on an HP Laserjet IIIP?
ANSWER : I don’t know what you mean by good toner cartridges. They haven’t been built in about 10 years, so if they are new OEMs in the box, they are guaranteed to fail. The 50 error on that printer is mostly a burned out fuser lamp. This site was sold, so as you can see, there are no more kits available.

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HP LaserJet 4

paper jam
ANSWER : If you remove the fuser (2 screws), look to the left and you’ll see a gear on a metal bracket. That’s the coupling gear. It drives the fuser. You’ll see that it is yellow with teeth missing. You’ll need to replace it. You have to take the formatter assy. to the left of it off, and then there are a few screws holding it in place.

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HP LaserJet 4

I just bought an officejet 3830 2 weeks ago. Now it won't print at all! Says inkjet jam. It's not! I've done all the fixes as per hp's website now what?
ANSWER : Take it back and exchange it under warranty.

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HP LaserJet 4

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 4

Keep getting a paper jam message. There is no jam.
ANSWER : You can quit wondering. Parts are unavailable. I’ve seen posts where people have 3D printed the parts or machined them out of metal.

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HP LaserJet 4

LaserJet 4 won't Power Up
ANSWER : I haven’t seen that particular behavior on that model. It either works or it doesn’t. My first choice would be the power supply.

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HP LaserJet 4