vii1234567Replacing a Toner Cartridge .................................................. 118When to replace a toner cartridge ..................................... 118Replacing a toner cartridge ............................................... 119Cleaning the Printer ............................................................... 124Daily care .......................................................................... 124Cleaning the transfer guide area ....................................... 125Chapter 7 Troubleshooting....................................................... 127When You Have Trouble Printing .......................................... 127Problems and Solutions Without Messages .......................... 128Responding to Error Messages ............................................. 132Call-for-service messages ................................................. 132Messages Table ................................................................ 134Skipping error messages temporarily ................................ 140Setting the printer to skip errors automatically .................. 140Clearing Paper Jams ............................................................. 141Restarting a print after clearing a paper jam ..................... 143z Face-up tray area .......................................................... 143x Face-down tray area ..................................................... 144c Imaging area ................................................................. 145v Optional envelope feeder area ..................................... 147b Multi-Purpose tray area ................................................ 149n Paper cassette area ...................................................... 150m Optional 500-sheet paper feed unit area ...................... 152, Optional duplex unit area .............................................. 153Correcting Poor Print Quality ................................................. 158When text is too light or dark ... ......................................... 158When you see vertical stripes or fading ... ........................ 159When you see black spots or white specks ... ................... 161Calling for service .............................................................. 162Reference Appendix 1: Typeface Samples .............................. 163Resident scalable font samples ......................................... 163Resident bitmap font samples ........................................... 164Resident scalable barcode font samples .......................... 164PostScript (option) font samples ....................................... 165Appendix 2: Symbol Sets Supported .................... 168ISO substitution table ........................................................ 188Appendix 3: Print Media Specifications ................ 189General specifications ....................................................... 189Plain white paper ............................................................... 190Colored paper ................................................................... 191Heavy (thick) paper ........................................................... 191Paper you can’t use! ......................................................... 192