HP DesignJet T830 User guide - Page 148

Vertical lines of different colors If your print has vertical bands of different colors along it: 1. Try using thicker paper, choosing from the recommended paper types such as HP Heavyweight Coated Paper. See Order paper on page 114. 2. Try using higher print-quality settings (see Printing on page 41). For instance, if you have set the Print Quality slider to Speed, try setting it to Quality. White spots on the print You may notice white spots on the print. This is probably due to paper fibers, dust or loose coating material. To avoid this problem: 1. Try cleaning the paper manually with a brush before printing, to remove any loose fibers or particles. 2. Always keep the cover of your printer closed. 3. Protect your paper rolls and sheets by storing them in bags or boxes. Colors are inaccurate If the colors of your print do not match your expectations, try the following: 1. Check that the paper type you have loaded corresponds to the paper type selected. 2. Check that you are printing on the correct side of the paper. 3. Check that you are using appropriate print-quality settings. For the most accurate colors, select Normal or Best quality. 4. Print the Print Quality Diagnostic Report. See The Print Quality Diagnostic Report on page 99. Colors are fading If you print on instant-dry photo paper, your prints will fade rapidly. If you plan to display the prints for more than two weeks, you should laminate them to achieve longer life. Prints on swellable coated papers will fade much less rapidly. However, lamination will increase the life of prints (depending on the type of lamination) with all paper types. For more information, consult your laminate provider. 144 Chapter 15 Troubleshooting print-quality issues ENWW