Canon Pixma iP3000

iP3000 power supply K30233 only has three wires.
Measure voltage with power supply pulled out of printer but with 3-wire plug still plugged up. Printers logic board turns power supply 8 volts stand by to 24 volts run voltage.

Pin 1 red wire = 8 volts dc printer off and 24 volts DC printer on.
Pin 2 black wire = printer ground
Pin 3 yellow wire = 0 volts dc printer off and 3.1 volts dc printer on.