HP d640 HP D640 High-Volume Printer - User Manual (Printer and Accessories), C - Page 122

Replacing Developer 4. Close the front door. 5. Press Done to return the printer Online. Replacing Developer Change the developer when it has either reached end-of-life, or diagnostic procedures have identified it as a source of problems. When the developer has reached end-of-life, the Control Panel will display: Developer at end of life replace developer The printer does not stop, but it continues to display the message until you replace the developer. Note To avoid possible damage, the printer will stop printing about 40,000 pages after the "Developer at end life" message first appears. Replace the ozone filter during every other developer replacement. Follow these steps for the developer replacement procedure: 1. Discharge old developer. 2. Add new developer. ("Adding New Developer" on page 4-12). 3. Replace the ozone filter ("Replacing the Ozone Filter" on page 4-17). Discharging Developer 1. Press Menu on the Main Screen. Figure 4-8 is displayed. Online Online Figure 4-8 Menu Menu Printing Configuration PCL Comms Maintenance Consumables Ordering and Replacing Consumables 4-9