Hp laserjet 2600n printer creates 1/2" wide band that you can almost see the print...like it is not getting toner in black color.

Cartridge faulty...
Two ways you can find out the faulty cartridge.
1. Remove each cartridge, just flip the drum shutter & chk for any toner bands appears on drum surface.. if found replace that cartridge..
2. Go to the paint. create four colored page as shown, print & verify which colored print mixed with bads.. replace that cartrdige.. ">

you need to shake the black toner, remove the toner, or maybe it need to replace already

First, make sure that the toner cartridges have enough toner. The toners may be exhausted. In case the toners are ok, the printer requires servicing/ cleaning of lenses and mirrors inside the printer.
Please refer here to my earlier solution to this problem, which was very helpful for the users of Color LaserJet 2600n Printer.


GoodLuck!
Dont forget to appreciate the solutions if I could have been of any help!
CreativeTECH

Yes you can. Press the arrows until you get in the screen the option system setup and press the check, then press the arrows again until you get print quality and press check, go to replace supplies and press check, press the arrows and you will see the option override out, press check two times and the unit will get back to ready, It might do a calibration but after that the unit will ignore the toner level and will print. By the way you can use color if there is still toner inside the color cartridges

It a problem with printer fusing assembly. so you can checked it from service center.

my hp color laserjet 2600n black toner always show message flshing what is the problem ?

There is an automated cleaning process

http://www.retrevo.com/r/258ag211/125/Cleaning+the+printer#q=HP+2600n

There is an override sequence and it works well. Press the select button (checkmark) to indicate Main menu. Press right-arrow (RA) to select System Setup. Press Select , then RA to Print Quality, Hit select. RA to Replace supplies and hit Select. Now, RA to Override Out and Select. Confirm with Select again. Your 2600n will now run even with an empty toner cartridge.

Replace the Magenta Toner cartridge.

the problem is cyan and yellow toner are low, u will change the cyan and yellow it will be cleared otherwise the will be empty u can't print any thing suppose one will empty other cartridge will not work