Yesterday i have repaired the printer canon ip2770 blinking orange and green one time alternately. I have check all condition of this printer and i found that the error caused by something that tucked in the roller, so motor rotation impaired. To solve this trouble follow this step :
1. Open the canon ip2770 case
2. Release all cartridge
3. Lift the printer upside down
4. O'clock to get out the dirt in the printer
5. Plug the cartridge and try to turn on the Canon 2770
6. If error still appear, please to disassemble the roller and find the dirt that clog rotation and clean up.
I hope this article will be help you. This step i prove and succes