My laserjet p3005 is not printing properly. there are 6 blank horizontal stripes across the page.

This is almost always going to be the toner cartridge. Swap it out if you have a spare. If not even if you have an empty one, just shake it a bit and put it back in to see if the blank lines go away. It is at least 90% chance or better that the problem is in the cartridge.
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