HP LaserJet 4345 Multifunction Printer series - Manual (Page 243)

Tire tracks
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This defect typically occurs when the print cartridge has far exceeded its rated life of 18,000
pages. For example, if you are printing a very large quantity of pages with very little toner
coverage, toner might still remain in the print cartridge but you have printed more than
18,000 pages.
1. Replace the print cartridge.
2. Reduce the number of pages that you print with very low toner coverage.
White spots on black
1. Print a few more pages to see if the problem corrects itself.
2. Make sure that the type and quality of the paper that you are using meet HP
specifications. (See Print media specifications .)
3. Make sure that the environmental specifications for the MFP are being met. (See
Environmental specifications .)
4. Replace the print cartridge.
Scattered lines
1. Make sure that the type and quality of the paper you are using meet HP specifications.
(See Print media specifications .)
2. Make sure that the environmental specifications for the MFP are being met. (See
Environmental specifications .)
3. Turn over the stack of paper in the tray. Also, try rotating the paper 180°.
ENWW Correcting print-quality and copy-quality problems 229