HP LaserJet 4 Service Manual - Page 52

EconoMode (HP LaserJet 4 Plus and 5 only) The EconoMode setting uses approximately 50% less toner than standard mode printing by reducing dot density. EconoMode, which can also be thought of as "draft mode," is user selectable via a front panel key, a Printer Job Language (PJL) sequence using HP Explorer's Remote Control Panel or through application software. The default setting is OFF. EconoMode, Medium Density Normal Mode, Medium Density Note EconoMode does not affect print speed or memory usage. Resolution Enhancement (REt) The printer Formatter PCA contains circuitry for Resolution Enhancement technology (REt), which modifies the standard video dot data on its way to the DC Controller to produce "smoothed" black-to-white boundaries. REt is user-adjustable from the front control panel, HP Explorer's Remote Control Panel (Print Quality Category) or from some software applications. Available settings are Light, Medium, Dark or Off. The default setting is Medium. Note REt settings sent from software or printer drivers override any control panel settings. 3-16 Configuration