The magenta and possibly yellow colours are not printing so photo/page comes out all wrong colour!

I'm assuming that the colour cartridge is a three in one. Blue, Yellow and Magenta.

When printing a colour document, the printer automatically balances colour mixtures from the three primary colours listed above. Should a print out be too red, its probably because its run out of yellow and/blue.

The best way to check is to print out a test page, you should get a block for each of the colours and black. If one's missing, there's your answer.

You may need to replace the magenta cartridge

There should be something like a printer properties menu. Find it and adjust the colour controls to manual and reduce the magenta settings etc. Also make certain you have the right type of paper selected on your printer, to the one you are using.

If the cyan, magenta and yellow blocks print correctly on the self test page but on pages from the computer then I woukld suspect a driver issue.
else
I would suspect the cartridge has run out of magenta ink. Try printing a diagnostic page.If the colors are "wrong" on this test then your cartridge is most likely the issue.

It all depends on the meaning of 'not properly'.

Try creating a document with four different squares, or words, of these colours: yellow, magenta, cyan and black. If all of them print (albeit not with the correct shades) it is probably an ICM driver error. But my guess is that only one of those four colors will print badly, due to a defective color cartridge.
The OKI 5150 makes all perceivable colours using cyan, magenta, yellow and black toners, so if one of these malfunctions, the resulting colors will lack the required shade of, say, yellow, and will appear to be "wrong". The yellow colour itself, of course, would simply disappear (the "yellow" you use might actually be 95% yellow and 5% cyan; then the "yellow" square will be printed as a very light shade of cyan, while the other colors - say, 95% magenta and 5% yellow - will turn out almost exact).

Try with the color test and replace any failing cartridge; if all four (almost) pure colours do print incorrectly, it's unlikely to be a cartridge problem, and we'll have to dig deeper.

Hi there. The reason for your problem is that the colour cartridge contains cyan, magenta and yellow ink, plus a black cartridge of course. All the other myriad colours are produced by mixing these four basic colours. So, if you print red, it requires ink from both the magenta and yellow cartridges. Thus if your red produces a yellow print, it means your magenta is not printing. This can be due to a number of reasons, mainly an empty or faulty magenta cartridge or blocked magenta print nozzles.

If you wish me to help you with sorting out the lack of magenta, please post a new comment to this effect.

Check your other colours. Anything other than a True Type Font is printed in colour shaded with black, so it sounds like you have a problem with yellow and cyan. Either the ink cartridges are out or the print heads have a blockage.
If the cartridges are not empty or v low, try sitting the print head over a folded paper kitchen towel damped with hot water for 10 minutes. Remove it and try your diagnostic again.

perform an Alignment test.

if your still having trouble then dont hesitate to contact.

if you have adobe photoshop click on image - selective colour- set the following cyan +15 magenta -5 yellow +10 black-15 this works on the pixma ip8500 so there is every chance it will work on others

This could one of a few fairly major problems. The easiest way to track down the fault is start by replacing the consumables - make sure you install them in the correct positions - it is possible on the C1100 to put them in the wrong places!! Change the toners first. Most importantly the magenta and yellow. Print several pages. Use MS Paint or similar to create a page with all four component colours on (cyan, magenta, yellow and black)in large blocks (see image below) and print them full page. Now look at the print and see if any one colour is missing or has reduced density. If you have a spare PCU you should but that in next. Let me know what the print outs look like and we will progress to the next step.