Printer Canon IP2770 blinking 7 times

Yesterday, i have repaired The printer Canon 2770 that blinking 7 times ( yellow led blink 7 times ) and 1 time orange. I clean the cartridge pin with tissue, the result is big zero. And then, i want to reset the cartridge with resetter software, but the blink appear in save mode also, so i can't do it. I cleaned the encoder sensor from the ink, but the blink still appear.
And the end progress i knew that the color cartridge is broken and i must replace with other normal cartridge. And yes, after i replace the color cartridge the printer working normally..