@The Hat@Nifty
my canon pixma shows P07 error and i cant enter into service mode by using the hold and press of power and stop button (3,5,6,7) times..
i cleaned the head, refilled ink.
still the error pops and led blinks.
I guess the printer model is Canon Pixma G3010? Error P07 means the ink absorber counter has reached 100% and the printer has been locked.
Here is a good thread with links to the service manual, and a video showing resetting the ink absorber counter by using push button codes so you don't need to buy a service tool.