HP LaserJet 3200 All-in-One Printer series - Manual (Page 193)

EN Resolving image quality problems
191
Vertical white lines
1
Print a few more pages to see if the problem corrects itself.
2
Make sure that media type and quality meet HP specifications.
3
Replace the toner cartridge.
4
If you noticed the lines on a copy output page or on a fax you sent
to a recipient, scan an item and see if similar lines appear on the
scanned image. (If the lines were on the scanned image, make a
copy and check for the lines.) If similar lines appear, see
“Recalibrating the scanner” on page 216.
5
The product’s internal mirror may be contaminated. Contact
Customer Service Center for service. See “HP Customer Care”
on page 251.
White spots on black
1
Print a few more pages to see if the problem corrects itself.
2
Make sure that media type and quality meet HP specifications.
3
Make sure that the environmental specifications for the printer
are maintained.
4
Replace the toner cartridge.