Canon Pixma MG7720 not printing black on pictures

[Rossitsa]

Hello!

My MG7720 is not printing black on pictures. I tried all the obvious stuff: changing the cartridge, cleaning the heads, deep cleaning... nothing works. I am using a glossy photo 4x6 paper, printing from Photoshop, and the printer automatically detects the paper, so I can't override the 'glossy' setting (I have been reading here that one can switch to the PGBK cartridge by selecting a different type of paper). is that the only way I can have pictures printed, and if yes, then how do I do it?

Thank you!

[Michael]

Hello.

If the PGBK black ink is not printing correctly after cleanings have been done, service may be required.  If you are printing on photo paper, make sure that you are specifying the correct media type is being specified in the printer driver on the computer before you send the print job. 

If the issue persists, please contact our support group at 1-800-652-2666 for additional assistance.