HP Color LaserJet Enterprise CP4020 Service Manual - Page 448
Clean the product, Clean the paper path
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Clean the product Over time, particles of toner and paper accumulate inside the product. This can cause print-quality problems during printing. Cleaning the product eliminates or reduces these problems. Clean the paper path and print-cartridge areas every time that you change the print cartridge or whenever print-quality problems occur. As much as possible, keep the product free from dust and debris. Clean the product 1. Turn the product off and then unplug the power cord and all interface cables. 2. Use a soft, water-moistened cloth to remove marks or spots from the surface of the product. Wipe the surface with a soft, dry cloth. CAUTION: Do not touch the ITB belt or the spongy surfaces of rollers. Skin oils and fingerprints can cause print quality problems. Clean the paper path 1. Press the Home button . 2. Press the up arrow or down arrow / to highlight the CONFIGURE DEVICE menu, and then press the OK button. 3. Press the up arrow or down arrow / to highlight the PRINT QUALITY menu, and then press the OK button. 4. If the product has automatic two-sided printing, go to step 5. If the product does not have automatic two-sided printing, press the up arrow or down arrow / to highlight the CREATE CLEANING PAGE option, and then press the OK button. Follow the instructions on the printed page. 5. Press the up arrow or down arrow / to highlight the PROCESS CLEANING PAGE option, and then press the OK button. The cleaning process takes several minutes. 6. Discard the printed page. The task is complete. 416 Chapter 3 Solve problems ENWW