Dell 1125 Mono Laser User's Guide - Page 27
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7. Close the front cover. Ensure that the cover closes securely. Maintaining the Drum Cartridge The drum cartridge has a standard life of approximately 20,000 pages. If the print quality appears reduced (e.g. steaks, spots, or fading) the drum cartridge may require cleaning or replacing. Printing a test pattern determines when the drum cartridge is faulty or depleted. To print a test pattern the printer mode must be changed to Diagnostic Mode. Perform the following steps to print a test pattern 1. Press Return ( ) four times, followed by Pause ( ) once. 2. The LCD displays Enter Password. Enter the diagnostic mode password 17951 and press Start (u). NOTE: Incorrect password entry cannot be corrected. Press Return ( ) and begin at step 1 above. 3. Press Scroll () to select Printer and press Select (P). 4. The LCD displays Print Test Page? 5. Press Select (P). A test page is printed. 6. Check that the test page appears as below.