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Encyclopedia > 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 different models, including the standard LaserJet 4 for business use, the 4L for personal use and the 4M for small businesses.[1] Additional models included the 4Si model, created as a heavy-duty business printer, and the 4V model, a B-size printer for desktop publishing and graphic artists. There are also Apple Macintosh specific variants of these machines with the '4M' designation. Hewlett Packard also released an upgraded version of the LaserJet 4/4M known as the 4 Plus ('4+')/4M Plus ('4M+'). 1993 Apple LaserWriter Pro 630 laser printer A laser printer is a common type of computer printer that reproduces high quality text and graphics on plain paper. ... Seinfeld was a pop cultural phenomenon during the 90s and became one of the most popular TV programs ever. ... LaserJet is the brand name used by the American computer company Hewlett Packard (HP) for their line of dry electrophotographic (DEP) laser printers. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... A comparison of different paper sizes There have been many standard sizes of paper at different times and in different countries, but today there are basically only two systems in place: the international standard (A4 and its siblings), and the North American sizes. ... Desktop publishing (also known as DTP) combines a personal computer, page layout software and a printer to create publications on a small economic scale. ... Graphic design is the applied art of arranging image and text to communicate a message. ... The first Macintosh computer, introduced in 1984, upgraded to a 512K Fat Mac. The Macintosh, or Mac, is a line of personal computers designed, developed, manufactured, and marketed by Apple Computer. ...


The LaserJet 4, especially the 4/4M/4+/4M+ models, have become known for their durability, mainly due to their reliable construction, as well as the printers built-in PCL (and optional PostScript) printer language support which is still used in computers to this day. Hewlett Packard dominated the laser printing sector during this time in part due to their reliability, relatively affordable pricing, as well as the spread of LaserJet 4 models from personal use up to heavy business use.[2] PCL is the abbreviation of: Perry-Castañeda Library of the University of Texas at Austin Pilot Controlled Lighting Polytechnic of Central London Printer Control Language Pacific Coast League Polycaprolactone Pig Chicken Legs This is a disambiguation page — a navigational aid which lists pages that might otherwise share the same... PostScript (PS) is a page description language and programming language used primarily in the electronic and desktop publishing areas. ...


The LaserJet 4 series has now been discontinued, and Hewlett Packard themselves have recommended the HP LaserJet 4250 as a replacement for the 4/4M/4+/4M+ models.

Contents


LaserJet 4 history

The LaserJet 4 printer was first introduced in October 1992 [3] [4] as the replacement for the HP LaserJet III.[5] The printer uses a (then new) Canon EX ("LBP-EX"[4]/P-270[5]) laser-xerographic engine, printing 8 pages per minute (PPM) at 600 dots per inch (DPI).[4] The LaserJet 4 was the first popular laser printer to first print at 600 by 600 dots per inch.[6] The printer supported the PCL printing language,[7] and could be upgraded with an optional accessory to use the PostScript language. 1992 (MCMXCII) was a leap year starting on Wednesday. ... Look up canon in Wiktionary, the free dictionary. ... To meet Wikipedias quality standards, this article or section may require cleanup. ... Dots per inch (DPI) is a measure of printing resolution, in particular the number of individual dots of ink a printer or toner can produce within a linear one-inch space. ... PostScript (PS) is a page description language and programming language used primarily in the electronic and desktop publishing areas. ...


The LaserJet 4 was the first LaserJet to use the Bitronics bi-directional parallel interface allowing communication between the host PC and the printer. This also allowed communication on the network allowing easier print network management [3]. The LaserJet also was the first LaserJet to be shipped with TrueType fonts, with 45 scalable typefaces built-in to the printer; this allowed the font on the screen to match the print output. TrueType is an outline font standard originally developed by Apple Computer in the late 1980s as a competitor to Adobes Type 1 fonts used in PostScript. ...


The EX engine in the LaserJet 4 (and the upgraded EX+ and EX-II enginges in the 4 Plus and HP LaserJet 5 respectively) was a significant improvement on the previous Canon CX and SX printing engines, and allowed Hewlett Packard to dominate the business laser printer market.[8] The LaserJet 5 was later released as a "better" LaserJet 4 Plus.


Macintosh variants

In all the models of the four series an 'M' designation identifies an Apple Macintosh specific version, with additional accessories for network connectivity (JetDirect (ethernet)/localtalk), PostScript Level 2 support and more memory, built-in as standard.[9] The first Macintosh computer, introduced in 1984, upgraded to a 512K Fat Mac. The Macintosh, or Mac, is a line of personal computers designed, developed, manufactured, and marketed by Apple Computer. ... Jetdirect is the name of a technology sold by Hewlett-Packard that allows computer printers to be directly attached to a Local Area Network. ... LocalTalk is a particular implementation of the physical layer of the AppleTalk networking system from Apple Computer. ...


4Si

The 4Si (and 4Si MX for the Macintosh) were heavy-duty business printers, produced using the Canon NX engine.[10] The 4Si worked at 17 PPM, and could be upgraded with a duplexing unit.


4L and 4P

The LaserJet 4 series also had additional smaller printers in the range: the personal-use 4L and the small-business use 4P (and the Macintosh specific 4ML and 4MP). These printers both used the Canon PX engine,[11] which like the EX was new at the time of release. The 4L used the 300 DPI[12] PX engine, with the 4P using the upgraded 600 DPI[13] PX-II engine.[1] The 4L was the first LaserJet with power-saving technology which turned off the printer when not in use [3].


4+/4M+

The LaserJet 4 Plus (4+), released in 1994, was the LaserJet 4 with the improved Canon EX+ engine which increased printing speed to 12 PPM.[14] This also provided the option for duplex printing (automatic double-sided printing) with the purchase of an accessory. The original 20MHz processor was also upgraded to 25MHz, with the addition of Hewlett Packard's Memory Enhancement Technology.[15] The printing mechanism was also improved to allow increased tones of grayscale [3]. 1994 (MCMXCIV) was a common year starting on Saturday of the Gregorian calendar, and was designated as the International Year of the Family and the International Year of the Sport and the Olympic Ideal. // Events January Bill Clinton January 1 : North American Free Trade Agreement (NAFTA) goes into effect. ...


4V

The 4V and 4MV were B-size printers for graphic artists[16] using the Canon BX-II engine.[2] Hewlett Packard did not consider the original BX engine as "good enough" for their LaserJet series. The 4V/4MV were released in 1994 and dominated the market due to their competitive price.[2] The 4V series was the first HP printer to offer an internal hard disk option [3]. A comparison of different paper sizes There have been many standard sizes of paper at different times and in different countries, but today there are basically only two systems in place: the international standard (A4 and its siblings), and the North American sizes. ... 1994 (MCMXCIV) was a common year starting on Saturday of the Gregorian calendar, and was designated as the International Year of the Family and the International Year of the Sport and the Olympic Ideal. // Events January Bill Clinton January 1 : North American Free Trade Agreement (NAFTA) goes into effect. ... Typical hard drives of the mid-1990s. ...


4LC and 4LJ Pro

The 4LC and 4LJ Pro were printers based on the 4L platform modified for the Chinese and Japanese markets respectively. The 4LC was the "first printer designed exclusively for the Chinese market" [3], and was released by HP in April 1995. This was followed by the Japanese 4LJ Pro in May 1995. Both of these printers used a 2 byte PCL that had been recently developed for Asian fonts, and came with memory upgrades and Chinese/Japanese fonts. Both printers worked at 600 DPI, with 2MB RAM. [3]


Comparison

Comparison table of HP LaserJet 4 models[1][3]
Model Introduction Canon print engine Print resolution (DPI)[17] Print speed (PPM)[18] Standard memory (RAM in MB) Maximum memory (RAM in MB)
4 (4M) October 1992 EX 600 8 2 (6) 32 (28)
4Si (4Si MX) April 1993 NX 600 17 2 34
4L (4ML) May 1993 PX 300 4 1 (4) 2 (4)
4P (4MP) October 1993 PX-II 600 4 2 (6) 26 (22)
4+ (4M+) May 1994 EX+ 600 8 ? ?
4V (4MV) September 1994 BX 600 16 4 (12) 68 (44)
4LC/4LJ Pro April/May 1995 ? 600 ? 2 ?

Dots per inch (DPI) is a measure of printing resolution, in particular the number of individual dots of ink a printer or toner can produce within a linear one-inch space. ... To meet Wikipedias quality standards, this article or section may require cleanup. ...

See also

PC Load Letter PC LOAD LETTER is an error message sometimes encountered when printing on older HP Laserjet printers. ...

Further reading

  • Computer Magazine - 1993 review of the HP LaserJet 4

References

  1. ^ a b c Google Groups - 1993 Usenet thread on printing engines in LaserJet 4 series (Accessed June 14, 2006)
  2. ^ a b c Printer Works - BX Engine (Accessed June 14, 2006)
  3. ^ a b c d e f g h Twenty Years of Innovation: HP LaserJet and Inkjet Printers 1984–2004 (PDF) (Accessed June 15, 2006)
  4. ^ a b c HP LaserJet 4 details (Accessed June 14, 2006)
  5. ^ a b Printer Works - LaserJet III information (Accessed June 14, 2006)
  6. ^ About.com - History of Computer Printers (Accessed June 14, 2006)
  7. ^ Printer Works - HP LaserJet 4 datasheet (Accessed June 14, 2006)
  8. ^ Printer Works - EX Engine (Accessed June 14, 2006)
  9. ^ HP LaserJet 4M Plus details (Accessed June 14, 2006)
  10. ^ Printer Works - 4Si (Accessed June 14, 2006)
  11. ^ Printer Works - PX Engine (Accessed June 14, 2006)
  12. ^ Printer Works - 4L (Accessed June 14, 2006)
  13. ^ Printer Works - 4P (Accessed June 14, 2006)
  14. ^ Printer Works - LaserJet 4 Information (Accessed June 14, 2006)
  15. ^ Windows Magazine - Top 100 best products of 1995 (Accessed June 14, 2006)
  16. ^ Printer Works - 4V (Accessed June 14, 2006)
  17. ^ Resolution is given in dots per inch (DPI)
  18. ^ Print speed is given in pages per minute (PPM)

 

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