Streaks paper laserjet

Drum or photoconductor will cause streaks/lines

I'm not familiar with this model but have you ran the cleaning mode if it has one?

The blue streak is likely caused by a bad cyan cartridge, not a bad belt. That will clean off after you replace the cartridge. The misalignment problem sometimes requires 3 complete full calibration cycles to eliminate the error.

Run the 1/2 test.
Load paper in the manual feed tray.
Print anything that requires more than 2 sheets.
As the paper enters the printer open the top cover.
Remove the toner cartridge.
Look down at the paper.
If it looks like the problems you described, change the toner.
If it looks good, reinstall the old transfer roller and rerun the test.
If transfer roller doesn't fix it, you have a bad fuser. Put the old one in and repeat.

Yip, its fuser film alright. You could pick up a fuser unit / kit from:

http://www.printersupplies.com/c-Laserjet3015Parts.html

and fix it yourself using the manual in this post:

http://www.fixya.com/support/t468332-fuser_removal_instructions_hp_laserjet

Best of luck
BD

when you open the front of the print you will see the streaks on the black transfer sheet.

Close the front door half way or until all the cartridge doors open.
You will see the same streaks on the problem cartridge(s) as on the transfer sheet.

Change that particular cartridge, let the printer recalibrate, and presto streaks are gone.

Checking the paper path for ink deposits might be the solution. I had a similar problem sometime ago, where the fuser got some scratch damage for unknown reasons and i suppose was causing unfused ink to accumulate after the fuser, leaving streaks on paper.

GENUINE HP COLOR LASERJET 2600 MAINTENANCE KIT - Kit Includes: 120V(220v) Fuser Unit, Tray 2 Paper Pickup Roller (D-Shaped Roller), Tray 2 Separation Pad Assembly - Includes The Spring Loaded Separation Pad In Holder Assembly - Genuine HP Part

Have you check the teflon at the heater? have you clean the reflector of laser? Try that.

Fuser sleeve is contaminated and needs replacing - cheaper to replace the printer.