What would cause unwanted color shadow boxes to be printed on document with a ink jet printer?

SOURCE: Shadow on printed page

You either have a bad toner cartridge or bad fuser. Measure the distance from and exact on image printered to the exact same spot on the page it appears again. If it's fuser it will be 41.0mm between image and defect. Any other spacing on the front of the page is usually cartridge.

Try replacing the cartridge first and if that doesnt fix the issue it's fuser.

Here's a link for the service manual. Look at page 117 to get a complete list on repetative defects and their causes.

http://www.feedroller.com/Store/Service%20Manual/HP%20LaserJet%201022%20(Q5912A),%201022n%20(Q5913A),%201022nw%20(Q5914A)%20P.pdf

Hope that helps you.

SOURCE: colors do not match up

Have you tried a few alignments? Also you can try turning the printer on and when you start hearing the alignment turn the printer off ... do this a few times and see if this helps.
Also you can try to manually align the cartridges.. to do this turn the printer off. Open the front cover to reveal the cartridges. On the right hand side you can see some gears. Try to turn one of these slightly.. one click (1mm) should do it. Now turn the printer on and let it align itself

SOURCE: printer output has shadows, blurring, streaks, lines, poor color

Seem like blocked hole(s) on the color print head...
Most likely if there is a deep clean option then do it (may need a few times to unblock a hole or never).
Also get the printer physically cleaned up if you can see dusts inside (vrtical lines on color bars).

SOURCE: HP 6940 color cartridge light will not stop blinking

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I might have an idea why this is happening....The print cartridges might need cleaning...
Follow the steps below to do this....


Step one: Remove the black, photo print cartridge, or the gray photo print cartridge

NOTE:
The black, photo print cartridge, or the gray photo print cartridge is in the right side of the carriage. -Lower the cover of the product.
-If the print cartridge status light flashes, proceed to Step two: Replace the print cartridge.
If the print cartridge status light is off, proceed to Step three: Manually clean the print cartridge.
Step two: Replace the black, photo print cartridge, or the gray photo print cartridge and remove the tri-color print cartridge
- Remove plastic tape from new ink carttridge CAUTION:
Do not touch the print cartridge ink nozzles or copper contacts. Touching these parts will result in clogs, ink failure, and bad electrical connections. Do not remove the copper electrical contacts.



NOTE:
The tri-color print cartridge is in the left side of the carriage.
-Lower the cover of the product. -If the print cartridge status light stops flashing, proceed to Step three: Manually clean the print cartridge.
If the print cartridge status light still flashes, replace the tri-color print cartridge. If the issue continues, service the product.


Step three: Manually clean the print cartridge
1. Gather the following items to clean the print cartridge and carriage:
o Clean distilled water. Use bottled or filtered water if distilled water is not available. Tap water can contain contaminants that damage the cartridge.
o Clean cotton swabs or any soft, lint-free material that will not stick to the cartridges (coffee filters work well).
o Sheets of paper or a paper towel to rest the cartridges on during cleaning.
2. Open the product cover, and wait until the carriage stops moving.
3. Remove the print cartridge, and place it on a piece of paper with the nozzle plate facing up.

NOTE:
Clean the contacts quickly so that the print cartridge is not outside of the product for more than 30 minutes. If the cartridge is outside of the product for too long, the ink can dry and clog the nozzles.
4. Unplug the product.
5. Dip a swab in the clean water, and then squeeze it to remove most of the moisture. The swab should be only slightly damp.
6. Clean the print cartridge contacts. Do not touch the nozzles.
7. Clean the contacts in the carriage, inside the product.8. Either let the print cartridge sit for ten minutes to allow the cleaned area to dry, or use a new swab to dry it.
9. Reinstall the print cartridge.
10. Plug the product back in.
11. Close the product cover.


Good Luck!
If there is anything more I can do for you please let me know if not and the problem is solved please rate it, Thanks, JCE

SOURCE: having problems with the tri-color ink cartridge

Assumming its an HP cartridge. Trying popping the cartridge in and out.