HP LaserJet 4

How to Identify and Fix Common Problems ?

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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.
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.
Low Quality and Improper Storage of Ink and Toner Cartridges. Low-quality cartridges or improperly stored cartridges can cause paper jams. For example, too much toner or ink can be released onto the paper, or the toner or ink can clump together in the cartridge.
Make sure you don`t overload the tray. A good way to stop the printer becoming jammed, is to fan the paper before you put it in the tray as this will shake out any dust and reduce static, which are two major causes of paper jams. Another way to avoid a printer paper jam is to keep your machine clean.
Among the more common technical issues that may bring down a printer are disconnected cables, malfunctioning routers, and low ink levels. Moreover, software problems such as interrupted connections or incorrect settings in your system`s drivers can also cause your printer to show up as offline.
Paper Jams

This is a common laser printer problem. Primary causes include grime, dust, worn rollers, or incorrect paper weight. The most basic way to prevent paper jams is simply through regular cleaning of your printer. Also, replace parts as needed.

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. Pull out the input tray, and then remove any jammed paper.
Paper curl is caused by an excess amount of moisture in the paper. The first step to ensure less paper curl is to store your paper in a cool, dry area. By doing so, you will reduce the amount of moisture and humidity the paper is exposed to. The next step is to always fan the paper before placing in the machine.
The following are the top reasons why paper jams occur:

incorrect paper settings in the tray and/or the print driver. paper loaded incorrectly and/or paper edge guides not adjusted properly in the tray. humidity and/or paper condition and storage. Use a new ream of paper.

For cleaning, HP recommends using HP Equipment Cleaning Wipes, but you can use an HP-approved lint-free wipe and deionized or distilled water. Note: If dark spots appear on back side of prints, clean drum screen. Note: If minilab prints more than 2000 prints each day, clean drum screen up to twice daily.
Use isopropyl alcohol or ethanol according to the manufacturer`s safety guidelines, as applicable. Wipe the roller with a lint-free cloth dipped in isopropyl alcohol or ethanol. After cleaning the roller, make sure that no lint or other material remains on the roller.
Paper curl is caused by an excess amount of moisture in the paper. The first step to ensure less paper curl is to store your paper in a cool, dry area. By doing so, you will reduce the amount of moisture and humidity the paper is exposed to. The next step is to always fan the paper before placing in the machine.
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. Pull out the input tray, and then remove any jammed paper.
Did you know most copier paper jams are caused by the paper itself? Misaligned paper. When a stack of paper isn`t aligned properly in the machine, it often causes a paper jam issue. When adding a ream of paper, always fan the paper, load carefully and avoid overstuffing the tray.

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