Clj2550L prints yellow on one page of the print job and not the next. All other colors print ok. Reseated the yellow cartridge, then replaced the yellow cartridge with a new HP yellow cartridge, replaced the image drum with a new HP drum. Printed out a status supply page and all cartridges show good.

Imaging drum reach 20,000 (black only) or 5,000 (color), replace the image drum.

Supplies life
The life of the imaging drum depends on the number of black-only or color pages that print jobs
require. Imaging-drum life is also affected each time the device calibrates because calibrating causes the imaging drum to rotate. Imaging-drum life is measured in terms of number of rotations rather than number of pages printed.
The type and length of print jobs also affects drum life. A series of short print jobs uses more drum
life than an equivalent number of pages printed in a single large job. To extend drum life, print
multiple copies of a print job at one time rather than sending the same job to the device multiple times.
The life of a print cartridge depends on the amount of toner that print jobs require. When printing text at 5% coverage, black print cartridges last an average of 5,000 pages and cyan, magenta, and
yellow print cartridges last an average of 2,000 pages. High-capacity cyan, magenta, and yellow print cartridges last an average of 4,000 pages. (A typical business letter has 5% coverage.)

Check the yellow toner cartridge, printing a configuration page.

Configuration page
The Configuration page lists the current settings and properties of the printer. You can print a
Configuration page from the printer or HP Toolbox. To print the Configuration page from the printer,
complete the following steps.
1 Press the (LEFT ARROW) or the (RIGHT ARROW) buttons to select the Reports menu.
2 Press the button (SELECT).
3 Press the (LEFT ARROW) or the (RIGHT ARROW) buttons to select Config report.
4 Press the button (SELECT) to print the Configuration page.

Yellow print OK?
No? try print with another yellow toner cartridge (Q6002A).

may i assume you removed tapes at the electronic side of cartridge?
shake the cartridges.

Now your computer should have a utility for settings the cartridge for
first time after loading them. Thisis to make sur the colors are mixing
to give the right shade.

Normally 1 single shade means the color cartridge is ending so may be you
double check you are not returning the same ending cartridge in the printer.

Hope that helped

The life of the toner cartridge yield depends on the amount of toner that print jobs require. The actual number may also be different depending on the print density of the pages you print on, and the number of pages may be affected by operating environment, printing interval, media type, and media size.

If you print a lot of graphics, you may need to change the cartridge.

The machine uses four colors and has a different toner cartridge for each one:

yellow (Y), magenta (M), cyan (C), and black (K).

• The status LED and the toner-related message on the display indicates which each individual toner cartridge should be replaced.





Trust this helps. Please vote. :)

Follow each of these steps until the problem is resolved:

Print a printer self-test by holding the power button down with a pencil and opening and closing the top cover four times.
Check the nozzle self-test pattern in the self-test print out. If one or more of the solid rectangular areas are missing, an electrical contact problem may be present.
Remove and then reinsert the print cartridge(s) into the printer.
Print the document.
If the problem persists, follow the steps listed above for cleaning the print cartridges and print cartridge cradle.
Try printing again. If the problem continues, replace the print cartridges.

http://www.fixya.com/support/t5717191-hp_deskjet_6540_printer_yellow_light

Either the ink you are using is not going to give the color you want, or you have print heads that are blocked.

The color cartridges print text that appears black by mixing the three primary colors (cyan, magenta, and yellow) to make composite black. To achieve a realistic black, large quantities of colored ink are used. Because black cartridges use much less ink to create a similar shade of black, they print more pages in black than the color cartridge.
If the color cartridges on the printer are next to empty, you will not be able to get perfect prints at all.

Please have the cartridges replaced to do the printing jobs again.

Yellow cartridge needs replacing . printer wont print in any other colors if one cartridge is empty

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Complete the following steps to resolve this issue.
Step one: Check the printin grayscale setting
If the self test page printed in color, the ink cartridgesare okay, and the ink levels are well above empty, the printer software hasprobably been set to print in grayscale. Follow the steps below to check thissetting:

1. In the software application you are trying to print from, click File, then Print. The Print dialog opens.
2. Make sure your printer is selected, then click Preferences. The printer Preferences dialog opens.
3. Select the Color tab, then make sure that Print in grayscale is not selected.
4. Try the print job again to see if this step resolved the issue.
• If the issue is resolved, you do not need to continue with the rest of the instructions on this page.
• If the issue is not resolved, continue to the next step.

Step two: Check the inkcartridges
NOTE:- HP cannot guarantee the quality or reliability of non-HPink.

1. Check the ink cartridges to determine if they have been refilled. If they have been refilled, try replacing them with genuine HP ink cartridges.
2. Try the print job again to see if this step resolved the issue. If the issue is not resolved, continue to the next step.

Step three: Check inklevels
Replace any empty print cartridges.

1. Press Setup .
2. Press to select Tools , then press OK .
3. Select Display Ink Gauge and press OK . The ink levels are displayed.

Figure 1: Ink levels

• Each icon corresponds to the cartridge that is the color of the icon. The icons are also in the same order, from left to right, as the cartridges in the printer.
• If an icon is empty, the corresponding cartridge may need to be replaced soon.
• The ink levels in non-HP, refilled, and remanufactured cartridges cannot be read by the printer. Instead of an icon, a question mark is displayed for these cartridges. HP cannot guarantee the quality or reliability of non-HP ink. Printer service or repairs required as a result of printer failure or damage attributable to the use of non-HP ink will not be covered under warranty.
1. Try the print job again to see if this step resolved the issue. If the issue is not resolved , continue to the next step.

Step four: Service theproduct
If you have completed all the steps listed above and arestill experiencing a problem, service the product.

Black cartridge is low! That means you have a few pages to print but yellow is off! maybe you can change the chip on the BLACK and YELLOW cartridge!!!!