not very compatible

During the implementation of these cartridges in my MP640 printer, everything seemed right: the cartridges were well recognized (lit red light at each cartridge).
First impression (a picture) -> Nickel

It is then that the problems emerged.
At almost every print request, the printer telling me a detection error of cartridges (sometimes several at once).
By opening the hood, I noticed that all the lights were yet lighted. So I close the lid, and after several seconds reset (with ink usage each time), or I was lucky and printing started, or it was again open the hood

After that, I put CANON cartridges (those shipped with the printer), and since the slightest concern printer.

BRIEF: NOT COMPATIBLE with the PIXMA MP 640 !!!!