Dell 1125 Mono Laser MFP - Manual (Page 27)

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).
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.
NOTE: Incorrect password entry cannot be corrected. Press Return ( ) and begin at step 1 above.