HP Color LaserJet 2605dtn won't print magenta at all.

I have the same exact problem. It seems like this is a design flaw in the 2600 series where the magenta part of the laser assembly gets dirty easily, and doesn't let enough light get through.


There are instructions on how to fix this, but it's pretty complex for the typical user.

Here's some info I got off the interwebs...


Fading Red Tones on Color LaserJet 2600s




HP Color LaserJets 2600n, 1600, and 2605 share the same basic Canon engine design. One aspect of the design brings the common problem of scanner optic degeneration due to dust buildup on mirrors and lenses. Since the most vulnerable mirror reflects its laser beam to the magenta toner cartridge, red tones are the first to show fading. Colors shift: purples turn blue and oranges turn yellow.


Fading reds, like death and taxes, are to be expected sooner or later—sooner in dirty environments. HP has not documented a cure. Its service literature does not cover removing, let alone cleaning, the laser/scanner assembly. Nor does HP sell replacement units.


The best test for faded colors comes from the "config report," printed from the control panel menus: Press Select (check mark key) twice, then the right arrow key twice, then Select. Blocks of color along right and left sides of the config report show fading if present.


The following procedure leads you through removing and cleaning the laser/scanner assembly, along with an explanation of why reds suffer first, followed by yellow, cyan, and finally black. I have the same exact problem. It seems like this is a design flaw in the 2600 series where the magenta part of the laser assembly gets dirty easily, and doesn't let enough light get through.
There are instructions on how to fix this, but it's pretty complex for the typical user.
Here's some info I got off the interwebs...
Fading Red Tones on Color LaserJet 2600s

HP Color LaserJets 2600n, 1600, and 2605 share the same basic Canon engine design. One aspect of the design brings the common problem of scanner optic degeneration due to dust buildup on mirrors and lenses. Since the most vulnerable mirror reflects its laser beam to the magenta toner cartridge, red tones are the first to show fading. Colors shift: purples turn blue and oranges turn yellow.
Fading reds, like death and taxes, are to be expected sooner or later—sooner in dirty environments. HP has not documented a cure. Its service literature does not cover removing, let alone cleaning, the laser/scanner assembly. Nor does HP sell replacement units.
The best test for faded colors comes from the "config report," printed from the control panel menus: Press Select (check mark key) twice, then the right arrow key twice, then Select. Blocks of color along right and left sides of the config report show fading if present.
The following procedure leads you through removing and cleaning the laser/scanner assembly, along with an explanation of why reds suffer first, followed by yellow, cyan, and finally black.