HP LaserJet 4

How to Identify and Fix Common Problems ?

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Check inside the printer for any debris that might be causing paper jams. Turn off the printer, and then unplug the power cord from the electrical outlet. Remove any paper from the input tray. Open the rear access door, and then clean the paper feed rollers with a lint-free cloth lightly moistened with filtered water.
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.
Updated: 02/07/2022 by Computer Hope. A paper jam is when paper or other printed material gets stuck or lodged in a printer and cannot eject. When this occurs, the printer does not function properly until the paper is manually removed.
Step 1: Turn off the computer and disconnect the AC adapter. Step 2: Remove all discs, memory cards, and nonessential peripheral devices. Step 3: Press and hold the Power button for approximately 15 seconds. Step 4: Reconnect the AC adapter and then turn on the computer.
Dirty printer rollers. If your paper jams are happening randomly and you can`t identify the cause, it could be that your printer rollers are dirty. Over time, dust and debris can build up on the rollers and cause the rollers to grab onto paper unevenly, which can lead to paper jams.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

HP LaserJet 1200 Early Feeding Causes Paper Jam
ANSWER : Seriously, dmzcompute, you are awesome! And this is just what the internet does so well: a specific fix for an esoteric problem, thus keeping a 15 year old machine alive another day. Thank you!

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HP LaserJet 4

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

Printer jammed, after jam clearance there is an error message
ANSWER : I am looking for steps to isolate this issue. I don’t suspect the formatter.

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HP LaserJet 4

jamming with no actual jam
ANSWER : I usually watch the pickup roller action through the opening at the back of th.e tray. That will give you some idea of why it isn’t feeding

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HP LaserJet 4

paper jam in back
ANSWER : If you can’t access it by removing the toner cartridge, then you’ll have to remove the metal back plate.

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HP LaserJet 4

13.02.00 paper jam
ANSWER : Sticking pickup roller solenoid. Easy to get to on that model. Remove top and right side covers. You will see it at the lower left. Remove the 1 screw holding it in and then take the top plate off being careful not to lose the tiny spring. Scrape off the goo and replace it with some thin sticky backed felt. You can find some in the local hardware store. It’s used for the bottom of chair legs.

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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