HP LaserJet 4 Service Manual - Page 102

Saving Toner with EconoMode (HP LaserJet 4 Plus and 5 Only) Toner cartridge life can be extended dramatically by using the EconoMode printing feature of the printer. EconoMode can be turned on or off via the printer control panel, through HP's Remote Control Panel or through a software application with the appropriate printer driver. Note EconoMode is recommended in portrait orientation only. Some software applications may refer to this as "draft mode". Software settings always override control panel selections. Storing the Toner Cartridge Do not remove the toner cartridge from its packaging until you are ready to use it. The shelf life of an unopened cartridge package is approximately 2 1⁄2 years of storage including usage; the maximum shelf life of an opened cartridge package is approximately six months including usage. Use the toner cartridge before the expiration date which is printed on its shipping box. Always store cartridges: • As specified on the shipping box, or horizontally (flat) if removed from the box. • In a normal office environment (for example, a location with regulated temperature and humidity). • Away from direct sunlight or other strong light. 4-6 Preventive Maintenance