HP LaserJet 4 Service Manual - Page 103

Installing the Toner Cartridge The toner cartridge is empty and must be replaced when the toner low message cannot be cleared, as described in "Clearing the 16 TONER LOW Message" later in this section. To replace the toner cartridge: 1 Open the printer's top cover and remove the empty toner cartridge. Note Inside the new HP toner box is a document which explains HP's toner cartridge recycling policy. Follow the instructions to package the empty toner cartridge and return it for recycling. 2 Remove the new toner cartridge from its box and remove the storage bag. Figure 4-3 Removing the Toner Cartridge Sealing Tape Preventive Maintenance 4-7