Method of controlling printhead

1. A method of controlling a printhead having nozzles which discharge ink by application of firing pulses to respective actuators, the actuators being connected in groups to a power source which applies said firing pulses, said method comprising applying firing pulses to each group of the actuators in turn to discharge ink from the nozzles in each group, the firing pulses being applied to subsequent groups so that the fired nozzles are physically separated in the printhead as far as possible from the nozzles fired in an immediately prior group and an immediately subsequent group.

2. A method according to claim 1 , further comprising sensing a temperature of the printhead to determine a temperature of the ink and comparing the temperatures of the printhead and the ink to values in a pulse duration table to determine a firing pulse duration.

3. A method according to claim 2 , wherein the firing pulse duration is further determined in accordance with a viscosity of the ink.

4. A method according to claim 1 , further comprising sensing an availability of voltage available to the actuators.

5. A method according to claim 4 , wherein a firing pulse width is varied in accordance with the sensed availability of voltage available to the actuators.

6. A method according to claim 1 , further comprising sensing a resistivity of a heater of each actuator.

7. A method according to claim 6 , wherein a firing pulse width is further varied in accordance with the sensed resistivity.