HP color laserjet 4500 Manuale Utente

104 Chapter 6 Toner cartridge information

 EN

When printing with a laser printer, the toner is applied across the page 
in horizontal strips. The page is moved through the printer and toner is 
continually applied. When printing text- or black-image pages, a large 
amount of toner is deposited on the page. As the amount of toner 
deposited on the page decreases, slight speed variations become more 
apparent. As the resolution (dots per inch) and the speed (pages per 
minute) increase, a variation in pattern intensity may appear on the 
page as lines or bands.

The bands are more visible in certain grayscale patterns. High speed 
printers that are capable of printing high resolution grayscale patterns 
are more likely to display the pattern variations. Changing the grayscale 
pattern or reducing the resolution may significantly reduce the amount 
of banding that occurs.

Small gaps or voids may appear in some of the characters when 
printing on media other than standard photocopier paper. These 
“character voids” occur because some print media does not accept the 
transfer of toner as well as others.

To minimize the occurrence of character voids, avoid media with a 
rough finish. Use media that is within the Hewlett-Packard paper 
specifications listed in the user guide, service manual, or HP LaserJet 
Family Print Media Guide. If the finish is too rough, the surface will 
consist of large inconsistencies. If the finish is too smooth, toner will not 
adhere well. Adjusting the print density may affect the severity of 
character voids.