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It is possible to clean the lenses and mirrors (with care not to scratch the surface silvered mirros AND not to disturb eany of the optical components)
There's quite a bit of dismantling to do to get to the laser unit, but if you work methodically (and remember to double check everything when you are 'rebuilding' the printer) it is certainly possible.
This is a common problem and also appens with HP Color Laserjet 1600, 2600, 2605, CM1017, and Canon LBP5000.
Use the menu (on the printer) to print antest page AND a configuration/information page.
Look (critically) at the alignment of the seperate coloure Yellow Magenta Cyan. You will probably find that these are out of aligmnent across the page.
The cause of this, is that the printer can't perform a calibration properly (printer probably takes a long time when calibrating too) and is usually down to failure of one of the sensors on the transfer belt.
Sometimes you can clean these and solve the problem, but often is a failure of the component itself. Thes are NOT available as a spare part, and the repair to correct this would need a replacement transfer belt.
Transfer belt replacement in this printer is quite an involved task, though it is within the capabilities of someone with reasonable mechanical aptitude.