ALARM CONTROL METHOD FOR DETECTING ABNORMALITY IN A DRIVE CIRCUIT OF AN ACTUATOR

摘要

A drive current for driving an actuator such as a printer motor, is generated based on a first digital signal comprising n-bit binary data which is supplied from a microprocessor, and is applied to an excitation coil (11) of the printer motor. The drive current supplied to the excitation coil is also converted into a voltage which is then converted into a second digital signal comprising n-bit binary data. The binary data of the second digital signal is compared with the digital data of the first digital signal to detect an alarm condition. Furthermore, the second digital signal is compared with first and second values to set plural alarm conditions.