I was scanning photos to my computer when suddenly the colour went a strange bright yellow. now when I try to print text from the scanner the page turns a yellow /green. Please help.

The printer head is defective, replace.

Make sure the ink cartridge is full or new. Get to the "Maintenance" page and try an alinement. (The ink dries and will clog the jets if not used often enough.)

One key diagnostic you need to perform is a nozzle check. This will tell you what has happened to the other ink colours as much as indicate if yellow is polluting other nozzles.
You can run a nozzle check from Printing Preferences > Maintenance.
Once it has printed you should (normally) see a sort of stepped grid pattern similar to this.
If you can scan or take a photo of the output and the post it as a follow up it'll then be possible to get a bit more of an idea of what could be happening.

Open the printer driver setup window
Select the manual color adjustment (or if already in manual and it had initially been printing fine, you may opt to select Auto)
On the Main tab, select Manual for Color/Intensity, and click Set....
The Manual Color Adjustment dialog box opens.
Specify the brightness

Select Light, Normal, or Dark for Brightness, and click OK.
The current settings are displayed in the settings preview on the left side of the printer driver.
Complete the setup
Click OK on the Main tab.
When you execute print, the data is printed at the specified brightness.

Hi Florian,

if the cartridges are full, but still not all colours appear, it could be a driver issue. Try uninstalling the printer, reboot and install it again. Even pull the cartridges out and back in, just to be sure. Preferably check for newer printer drivers on Canon´s website. Let me know how it ended up Flo, ok?

It may be caused by driver conflict. Try to reinstalled OS and driver.

turn the printer on, place the picture on the glass, on the printer under mode press the big silver button until the scan light comes on  then press select, you should hear the picture scanning, then on the computer, go under my pictures and you should see that picture. 

Epson's RX620 scans and prints photos at high quality. Text, however, was slow to print and not that good.
Epson's multifunction devices fall into two categories: general-purpose models that are designed for home or small office use, and photo-oriented devices such as this, aimed more at the enthusiastic amateur snapper.
Because it's a photography-centred device, the RX620 uses dye inks. On photo paper, these produce more vibrant colours than pigment-based inks, and a true gloss finish, but on plain paper produce inferior, less vivid results.
The Stylus Photo RX620 is quite large, and looks dated - but it's not short of modern photo-printing features. Its built-in memory card reader is compatible with seven commonly used digital memory formats, including xD and SmartMedia. Photographers using film will appreciate the scanner, with its high optical resolution and transparency backlight.
On plain paper the RX620's text printing showed bandingand rough outlines on default settings. Our five-page black-and-white text document took two and a half minutes to print. Increasing quality settings made it even slower.
We tried realigning the print heads to improve print quality. The RX620's manual process involves choosing the best-aligned examples from four rows of 15 patterns. This takes good eyesight, and it can be hard to choose between similar-looking options. We needn't have bothered - text remained unchanged.
Photo printing was far better. The RX620 produced some of the best prints we've seen from a multifunction device, but only at its highest quality - and slow - setting. Our A4 test picture took 15 minutes 12 seconds to appear.
The RX620's scanner is excellent, previewing an A4 sheet in six seconds and scanning a 6x4in photo at 600 dots per inch (dpi) in just 14.5 seconds. Negative scan times were reasonable, with a single frame scanned at 2,400dpi in 1 minute 40 seconds.
The RX620 can perform many advanced functions without being attached to a computer, and its colour screen has a clear menu system. Prints can be made directly from memory cards, photo prints or even film. There are four document copying settings, but results using the default Text quality are adequate for most office purposes.
The RX620 isn't a brilliant multifunction device. It does many things well, but its printer is too slow, and simply not good enough on plain paper.






Please rate my solution after reading it. Thank you

Same problem as above with my HP scanjet 2400.

First thing to try is just play with all the scan settings to see what gives you the best result - try changing resolutions, type of document, type of output document, contrast, brightness, type of scan. If this doesn't give you any better results, then one of the best ways to do this is to get some plastic sheet of the same or almost the same as the predominant colour on your forms (you can go one step further and make a multi coloured filter if you are feeling creative and your forms are all identical). The text jumps out of the page and most scanners will give you a good scan - just make sure the filter is not too thick/dark. Hope this helps :)