Patent ID: 7255415
Filing Date: 2007-08-14
Classification: B41J

Abstract:
1. A method of controlling a printing apparatus which needs to periodically execute maintenance operation after activation, said printing apparatus having a timer for counting time on the basis of an internal time, where the timer is operated by power supplied from a local battery and configured to set an internal flag when a power failure of the local battery has occurred, the method comprising: setting the internal flag in a register of the timer when a a power failure has occurred in the local battery of the timer; reading the internal flag to determine whether the power failure has occurred based on the status of the internal flag set in said setting the internal flag step; setting an updated time as the internal time when the power failure has occurred based on the result from said determining step where the updated time reflects correction from an error caused by the power failure of the local battery; designating execution of a maintenance operation on the basis of the internal time set in said setting an updated time step; and clearing the flag after setting the new time at said setting an updated time step.