Hp LaserJet 4 white spots

HP LaserJet 4

How to Identify and Fix Common Problems ?

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This can be caused by debris or contamination on the drum, the transfer corotron, the device not positioned properly on a solid flat, level surface, or by using old or damp paper.

What causes the spots? The usual cause is a dust particle that falls on or is stuck to the paper. Then as the paper runs through the printer, the ink gets laid on top of the particle instead of the paper surface. Eventually the particle falls off leaving a white spot where it blocked the ink.

Dots are typically caused by foreign material inside the machine (for example, paper dust, glue from labels or envelopes, paper clips, staples) sticking to or damaging the surface of the drum. Toner builds up on or sticks to these areas on the drum and creates black dots on the printed pages. 2.

If you find dots or spots appear on your printed documents this is usually caused by paper dust or objects such as staples or paper clips sticking to the surface of the drum. Toner builds up around these areas which in turn creates the dots or spots which then appear on your print-out.

White lines will typically start appearing on your print outs due to a clogged up printer head. Your first port of call when solving this problem is to run the cleaning program on your printer, which should be accessible through its settings menu.

Use a base layer of alcohol-based markers

By using a base layer of alcohol-based markers you immediately eliminate all white spots on the paper.

Wipe clean the cartridge carriage where the cartridge connects to remove any dried ink (make sure the printer is off and unplugged). If the printhead is built into the printer, clean where the ink comes out with a damp cloth. Re-install cartridges and run a print head cleaning process.

White streaking through the printout or an entire missing color both indicate an empty cartridge. If the cartridge is depleted of one color, it needs to be replaced. Each color is necessary to create the colors used in day-to-day printing.

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.

A Machine Identification Code (MIC), also known as printer steganography, yellow dots, tracking dots or secret dots, is a digital watermark which certain color laser printers and copiers leave on every printed page, allowing identification of the device which was used to print a document and giving clues to the …

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