Prints are coming more magenta in colour - In Office Equipment & Supplies

SOURCE: canon ip4200 colour magenta

the colors transfer to the printhead by gravity. the felt on the inktank must make intimate contact with the stainless steel filter in the printhead. I have a pixma ip 6000D that I had to replace the printhead inside of two years three times. the bubblejet circuitry in the printhead got burned out. New heads cost from $55 to over a hundred.

SOURCE: magenta ink colour

I had the same problem. Try cleaning the print heads. They tend to clog. Remove the cartridges, then remove the print head. Tilted slightly, it comes out easily. Run very warm to hot water over the print heads until they all run clear. Use a turkey baster to apply strong pressure to each head until it runs clear. Blow off the excess water with mouth or blow dryer. Insert into the printer and proceed to print. If that doesn't solve it, you might have a bad cartridge, but there isn't much that can go wrong with the cartridge. I have an ip4200 and an MP830. They have the same print heads and same cartridges. I have cleaned each twice and they work like new.

SOURCE: MP700 Magenta horizontal stripes

I have the same problem. Here's the advice I found somewhere on the internet:

If a jet (nozzle) in your cartridge has gone bad you will see horizontal bands and/or white streaks in your print. Print characteristics may appear incomplete and/or the filled in areas on may not show up.
1) Run some warm water over the print head. This can wash away any ink which might have dried in the cartridge print head. Dry the cartridge with a lint-free cloth before placing back into the printer.

2) Clean the contacts on the cartridge (the copper colored circuitry) and the contacts where the cartridge clips into the printer with water or alcohol. After cleaning, insert and remove the cartridge from the printer a few times to be sure you have a good connection between contacts on the cartridge and the printer.

3) If your print is smeared cleaning the wiper blade may fix the problem. Do this according to your printer manual instructions.

SOURCE: magenta not printing, just giving a faded colour insted

You must clean the mirror/optics in the laser scanner unit.
Because the magenta mirror is the lowest and facing up, there is most of the dust...
Laser scanner unit is a black plastic box, fixed with 3 screws.
You must remove rear cover , then almost all cables, right cower, circuitry on back together with metal plate to access it.
Almost 2 hours of work if you are a bit professional..
Hope it works

SOURCE: My Pixma iP4200won'y print the magenta colour so

You may need to replace the magenta cartridge