HP color laserjet 2550 series Manuale Di Servizio

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Repetitive defects on the back
Marks repeatedly appear on the unprinted side of the page at even intervals.
Internal parts might have toner on them. The problem will likely correct itself after a few
more pages.
Clean the printer. Open the HP LaserJet Toolbox to use the cleaning page. See 
The fuser or imaging drum might be damaged.
If the problem is not resolved, see 
.
Misformed characters
If characters are improperly formed so that they produce hollow images, the paper might
be too slick (for example, photo, glossy, or coated paper). Use a different paper, such as
high-quality paper designed for laser printers. See the HP Color LaserJet 2550 Series
Printer User Guide
 for information about print-media specifications.
If characters are improperly formed so that they produce a wavy effect, the laser/
scanner might need service. Verify that the problem also occurs on the Configuration
page. If so, replace the laser/scanner.
If the problem is not resolved, see 
.
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Chapter 6 Troubleshooting
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