Canon mx 850 problem is when the copy button is pushed to make a black and white copy the printer acts as if it is printng color. Prints very slowly. Phil

You only have to make single color copies with each color CMYK
and check all the copies if only the black and white copies is smeary
then replace only the black the drum unit.

Try first fo clean the cartridge/nozzle using the printer utility installled on your computer then after that try to print a plain text and see if its working fine already...

Good luck........

Sorry, steve, that you are experiencing this problem.

According to canon.com's website regarding the i9900 InkJet Photo Printer:

Why color ink may be used when printing in black and white Even when printing in black and white, color ink is used for the following reasons:

1. Automatic cleaning of the print head.
   
   To prevent the print head nozzles from clogging, the print head is automatically cleaned periodically. At that time, a small amount of each color ink is consumed.
   
   Therefore, although printing in black and white is performed, color ink is also consumed.
   
   
2. Color inks may be used to create black.
   
   When printing in grayscale or on photo paper or when duplex printing, although printing appears in black and white, the color black may be created using the three (cyan, magenta, and yellow) color inks. Printers without a pigment black tank / cartridge will print black / grayscale will create a composite black using color ink even on plain paper.
   
   Therefore, although printing in black and white is performed, color ink may be consumed.
   
3. In order to keep the heavy black ink from smearing on the page or in the printer, color ink is used when duplex printing to help create black text.
   
   ---

I might suggest taking out the color ink cartridges leaving only black there, but some printers don't take kindly to this. So, you may have to further experiment with magenta, cyan, and yellow to make it at least seem b&w to your best eye's judgment.

Good luck on this.

Check your settings for your printer software program, change it to black and white, and then you will need to change it back to color, if you want to print in color.

There are two buttons on the MX310... one for colour and one for black & white.. Depending on which mode you're using (ie: copy, fax, etc..) these buttons will copy, fax, etc...in either colour or black & white accordingly.

These buttons are located on the far right of the control panel with colour closest to the user, black & white above that and then the stop button above and right.

To fax in black & white (or mono as it's otherwise called) just choose the Fax mod, then press the Black button and you're away...

Hope that helps.

Does this model printer have the capability to print black and white from a color image?
Link to manual below:
http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&tabact=SupportDetailTabAct&fcategoryid=238&modelid=15403#DownloadDetailAct

don't click on color, click on black/white and it should work

Are you scanning both black and white and color the same way? The ADF (automatic document feeder) uses a different scanning area than when you place the document on the scanning glass. If you open the scanner cover, look to the left of the main scanner glass to the narrow strip used for the ADF. Make sure this narrow strip is clean -- no ink or white-out or scratches. This can make your copies look dirty or smudged.

NOTE: The problem occurs because of the trickle development system in the machine, making extended lengths of black and white copies / prints does not allow the black developer housing to purge itself of excess waste Toner (Dry Ink) and Developer. There are two solutions for the problem:

• Make 1,000 copies / prints of a black and white job, then make 150 copies / prints of full color. Continue making 1,000 copies / prints of the black and white job, then 150 full color, and so on, until the entire black and white job is complete.
• Make extended jobs in groups of 100 by making 100 copies / prints of the black and white job, then allowing the machine to cycle down (return to 'Ready') and making the next 100 copies / prints. Continue in this pattern until the entire black and white job is complete.

NOTE: The above solutions are based on jobs using 8.5 x 11 inch paper, single sided, with no more than 28% coverage.

: The problem occurs because of the trickle development system in the machine, making extended lengths of black and white copies / prints does not allow the black developer housing to purge itself of excess waste Toner (Dry Ink) and Developer. There are two solutions for the problem:

• Make 1,000 copies / prints of a black and white job, then make 150 copies / prints of full color. Continue making 1,000 copies / prints of the black and white job, then 150 full color, and so on, until the entire black and white job is complete.
• Make extended jobs in groups of 100 by making 100 copies / prints of the black and white job, then allowing the machine to cycle down (return to 'Ready') and making the next 100 copies / prints. Continue in this pattern until the entire black and white job is complete.

or

1. Power OFF the machine.
   
   
   
   
2. Wait 30 seconds.
3. Power ON the machine.