HP 2420 Service Manual - Page 223

Curl or wave 1. Turn over the stack of media in the tray. Also, try rotating the stack 180°. 2. Make sure that the type and quality of the media that you are using meet HP specifications. (See Media specifications.) 3. Make sure that the environmental specifications for the printer are being met. (See Operating environment.) 4. Try printing to a different output bin. 5. If paper is lightweight and smooth, open the Configure Device menu at the printer control panel. On the Print Quality submenu, select FUSER MODES, and then select the paper type that you are using. Change the setting to LOW, which helps reduce the heat in the fusing process. (See the user guide.) You must also set the type of media for the tray that you are using. (See Printing by type and size of media (locking trays).) Wrinkles or creases 1. Print a few more pages to see if the problem corrects itself. 2. Make sure that the environmental specifications for the printer are being met. (See Operating environment.) 3. Turn over the stack of media in the tray. Also, try rotating the stack 180°. 4. Make sure that media is loaded correctly and all adjustments have been made. (See the user guide.) 5. Make sure that the type and quality of the media that you are using meet HP specifications. (See Media specifications.) 6. If envelopes are creasing, try storing envelopes so that they lie flat. ENWW Correcting print-quality problems 209