The 1992 LaserJet 4L marked the transition between a control panel evolved for an informed operator and one evolved for a casual user. It had a 100,000 copies per month duty cycle, and 24 ppm print speed. In November 1996 the HP 5Si Mopier was introduced, claimed to be the first network printers optimized to produce multiple original prints (mopies). They included infrared technology, for wireless printing. In October 1996 HP introduced its first printers in the LaserJet 6 range, the 6P and 6 MP, both aimed at small offices. The Color LaserJet 5 and 5M were introduced in March 1996, with 1200 dpi resolution. Many 5Si LaserJets remain in service today. These paper-handling issues were easily dealt with. crashing if mains voltage was less than 120 Volts) as well as a weak clutch in Tray 3 (thus resulting in paper jamming for Tray 3 as well as the optional 2,000-sheet Tray 4), and also a weak solenoid in the manual feed tray (Tray 1). The 5Si series were true workhorses, but initial models were somewhat hobbled by a vulnerability to slightly low voltage (i.e. Automatic personality switching (between PCL and PostScript), a feature that first appeared on the 4SiMX, was standard on the 5SiMX. An internal duplexer enabled full-speed double-sided printing. The 5Si, based on the Canon WX engine, could thus provide 11'x17' printing at an unprecedented 24 pages per minute and at 600 dpi with resolution enhancement. In November 1996 HP introduced the network-ready LaserJet 5Si, a major revision and upgrade to the 3Si (IIISi) and 4Si, which had used the Canon NX engine.
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