HP LaserJet 4 Service Manual - Page 98
Life Expectancy of Consumables - paper jams
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Life Expectancy of Consumables Always inspect the components listed in Table 4-1 for wear when servicing the printer. Replace these components as needed, based on printer failures or wear, not strictly on usage. Table 4-1 Selected Service Consumables DESCRIPTION 1. Toner Cartridge QTY EST. LIFE (pages) REMARKS 1 68001 When print becomes faint, shake cartridge to distribute remaining toner. 2. MP (Tray 1) Pickup Roller Assembly 1 200,000 Replace roller and separation pad together. 3. PC (Tray 2) Pickup Roller 1 200,000 Look for glazing and cracks. 4. Separation Pad 1 200,000 Look for glazing and grooves. Replace together with Pickup Rollers. 5. Transfer Charging Roller 1 200,000 May affect print quality and/or paper jams. 6. Fuser Assembly (115 V, 50/60 Hz) Fuser Assembly (220 V, 50 Hz) 1 200,000 1 200,000 May affect print quality and/or paper jams. Look for marks on rollers. 7. LC (Tray 3) Pickup Roller 1 200,000 Look for glazing and grooves. Replace the Separation Pad. 8. Exhaust Fan 1 25,000 hrs. Notes: The estimated Toner Cartridge life is based on A4 or letter size prints with an average of 5% toner coverage, and with the density setting at 3. Note For part numbers of the components listed in Table 4-1, see Chapter 8. 4-2 Preventive Maintenance