Canon printer i850, i950, S600

Start with the printer OFF
1. Hold down RESUME and then hold down POWER
2. release RESUME
3. press RESUME twice, then release POWER
4. Let green light blink until printer is done futzing Select function with RESUME press POWER to execute: presses - light color - function

Number of presses - light color - function
0 presses - green - Test print (or exit service mode on i960)
1 press - orange - EEPROM info print (plus grid nozzle diagnostic on i960)
2 presses - green - EEPROM initialize
3 presses - orange - Reset waste ink counter