When i print ,white lines appear everyother line--

Hi
First before you buy a new cartridge,try doing a 'printhead' cleaning on your machine.Sometimes the printheads need cleaning clogginl.

Is it a white or black line?There can be a piece of paper in the drum cartridge or the drum is damaged!Scratched!Try replacing the drum cartridge!Good Luck!

try getting a new printhead for free. call 1.800.421.6699 for a new one.

See Charge roller my be dirty or Catriges PCU Units

Follow this link, and try these steps...
especially #2, and #5.
http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&fcategoryid=116&modelid=15483#SupportDetailAct

Try cleaning the optics and the charge corona. If you do not have the operators manual which outlines the proceedure, go to www.welcome.solutions.brother.com. The proceedure is in the CLEANING documentation. Make sure the wire cleaner is pushed all the way back to its home position. Otherwise, the white line may return if the cleaner is left in the expoure path. IF THE WHITE LINE APPEARS ON PRINTED PAGES GENERATED BY YOUR COMPUTER, THE WIRE CLEANER IS THE MOST LIKELY CAUSE.. IF THE WHITE LINE APPEARS ON PRINTS THAT WERE SCANNED USING THE BROTHER SCANNER, THE OPTICS MAY BE SMUDGED. LOOK FOR CORRECTION FLUID ON THE GLASS **** (THE NARROW SCAN GLASS). THIS IS THE USUAL CAUSE.

For Photosmart 7960...
Hit MENU
Select "TOOLS" by hitting OK
Select "Clean Cartridges" by hitting OK
Carefully review printed output for white lines on printed areas
If white lines appear:
Select "SECOND level cleaning" by hitting OK
Carefully review printed output for white lines on printed areas
If white lines appear:
Select "THIRD level cleaning" by hitting OK.

Replace Black ink cartridge with New HP one, should print same problem in write too if this is the right fix

White Lines on the Printed Page ID:193
Clean the print nozzles as follows:

1. Go to Start, Programs, Lexmark, Lexmark Solution Center (or Lexmark Control Program) and select the Cartridges tab.
2. Select Cartridge Nozzles (or Clean Print Nozzles).
3. Check the diagonal lines above and below the solid horizontal lines. The diagonal lines should be continuously solid from left to right, with no gaps.
4. If there are gaps at the top that diminish at the bottom, run the Clean Print Nozzle page a few more times. If the gaps are gone, the Clean Print Nozzle page has probably resolved the problem.
5. If the gaps still exist, you should unblock ("wick") the cartridges. See How to Unblock/Wick the Cartridge Nozzles.
   For additional help, refer to the following article: How to Clean the Maintenance Station .

Try changing the driver settings to a higher or lower quality output. If the problem changes it would suggest that the alignment is till not quite right. This sounds like a BiDirectional mis-alignment issue. You could also try my under head cleaning routine, which is cheap and easy and solves many problems. Review my previous post about cleaning HERE -> http://www.fixya.com/support/t137335-problem_print_outs_from_printer