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When you are printing a photograph, the back is resultant of combination of RGB but when you print a latter of document it usages only the black ink. So since the black is properly printed when it's combining RGB that means any of the color is low on ink. Replacing the color cartridge will solve the problem for you.
Option 1 - when printing, go to printer settings and select 'Plain Paper' as the Media Type. If any other paper type is selected, color ink will be used to create black. The pigment black ink will only be used when printing on plain paper. Check the box for 'Grayscale Printing'. If either 'Borderless Printing' or 'Duplex Printing' are enabled from the Page Setup tab, grayscale will be created using a combination of the color (dye) inks to prevent smearing. I tried this once myself, but the result seemed to be useless for printing photographs.
the pixma printers use the large black tank in most modes like text and standard (default) or fast photo printing .. thats most economical when you are using just plain paper .... it will switch to the small black tank only if you select "High" quality mode .. that black matches the nature of the color inks much better and results in really good color pictures if you are using Gloss or Matt high quality photo paper .. you can select the quality level by the following ... when you start to print, a window comes up where you can select which printer you want ... at the right of this window is "preferences" .. click that .. now select the type of paper and "High" quality mode .... now the printer will slow down but will provide really nice results and it will use the small tank black ink instead of the large tank ....the small tank is only used for "high" quality photo prints which is only needed for high quality photo paper .. if you havent tried that yet you might want to get some glossy photo paper (either Canons or Costco has great stuff if you want a lot, like 150 sheets) but most glossy paper will work except colors might need tweeking for some ... print a nice photo in the high quality mode and you should be really impressed .. and you will be using your small black ink tank .. you might want to make the first few pictures small (2x3 inch) untill you are sure everything is the way you want it .. i usually print in the top left corner first .. then reinsert the same paper and try again right next to that .. i do that until i get the colors perfect .. then i print big .. 5x7 or even 8x10 on a new sheet... the high quality mode can be selected for just plain paper and it will use the special black ink but it doesnt result in a better picture .. so no point in doing that unless you want to experiment .. if you never print high quality photos then you will never use the small tank black ink .. it will still be used up eventually because of normal head cleaning the machine does automatically .. ...
grey scaling does not select the special ink unless you select "High" for the quality setting .. then yes you can print using that small tank black ..again it will buy you a lot if you are using High quality photo paper ... almost nothing for plain paper but at least it will allow you to use that ink .. ..
Have you tried a cleaning cycle? If not, try one. Now run a nozzle check using the status monitor (right click the little printer icon in the bottom right corner of the screen and select nozzle check). Is there any sign of ink on the paper. Try up to three cleaning cycles. If ink is now flowing, but not yet perfectly, don't carry out any more cleaning cycles. Just leave the printer for 24 hours (to allow any air in the print head to disperse). Then repeat the cleaning cycle/wait process. It may take a while to restore a perfect nozzle check print. If these actions produce no positive results, report back.
Cartridges may give a very slow printing if internally damaged, or : When using colored paper in the all-in-one, printing or copying is slow.This issue is a result of the automatic paper type sensor misreading
the colored paper as photo paper. The print out takes longer because
the unit is printing in Best mode instead of Normal mode.
, point to
, and then click
Printers and Faxes
Right-click the appropriate all-in-one, and then click
tab and under
This sets the default paper type setting to Plain Paper.
You can try:
1. go to Start, Printer and Faxes, right click on your 3745, click on Properties, Printing Preference;
2. Check to see if you have any Advanced tab or button;
3. Check if you can set the printer to text only;
4. Check if you can set the printer to use black ink only.
5. In MS Word, verify through the use of Print Preview that your document is as you would want to be printed;
6. In some instances you may have to set manually text color in MS Word. While your document is open, click Ctrl + A to select all, then choose font color to "Black". Alternately, in your MS Word, you can click on "Format", "Font", "Font Color" set to "Black" rather than "Automatic" and set this as the "Default" setting.
Hope this be of some help/idea. Post back how things turned up or should you need further information.
Good luck and kind regards.