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HP LaserJet 4. The HP LaserJet 4 (abbreviated sometimes to LJ4 or HP4) is a group of monochrome laser printers produced in the early to mid-1990s as part of the LaserJet series by Hewlett-Packard (HP). The 4 series has various models, including the standard LaserJet 4 for business use, the 4L for personal use and the 4P for small businesses. [1]
The HP LaserJet 5 is a group of monochrome laser printers produced in the mid-1990s as part of the LaserJet series by Hewlett-Packard (HP). [1] It is the successor to the HP LaserJet 4 series of printers. After the LaserJet 5 series, however, HP introduced a new naming convention for its LaserJet line.
A HP LaserJet 4000n printer. The LaserJet 4000/4050 and their respective variants were the first printers released in the 4000 series. The LaserJet 4000 series printers print letter paper at 17 pages per minute, and can be set to print at 600 dpi or 1200 dpi, although when set to print at true 1200 dpi, the printer runs at reduced speed.
Yellow dots on white paper, produced by color laser printer (enlarged, dot diameter about 0.1 mm) Printer tracking dots, also known as printer steganography, DocuColor tracking dots, yellow dots, secret dots, or a machine identification code (MIC), is a digital watermark which many color laser printers and photocopiers produce on every printed page that identifies the specific device that was ...
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It offered 10 ppm, an HP Instant-on fuser, 600 dpi with HP REt boosting output effectively to 1200 dpi, a 2.5-cent cost per page, and a 7,000-page monthly duty cycle. In 2002, the 8150 was discontinued and was replaced by the 9000 series, which produced 50 pages per minute and used an internal duplexer.