Image forming system, determining method, and medium

A determining method for determining an end of a service life of an image forming system or a remaining amount of the service life of the image forming system, the image forming system including:

• a head;
• a carriage moving mechanism including:
• a carriage on which the head is mounted;
• a motor;
• and
• a transmission connected to the carriage and the motor;
• a motor driver;
• an encoder;
• and
• a controller, wherein:
• the controller is configured to perform moving control of the carriage by inputting an operation amount for moving the carriage in the main scanning direction at a target velocity into the motor driver based on a moving velocity of the carriage detected based on the encoder signal output from the encoder;
• and
• the motor driver is configured to apply a driving power based on the operation amount to the motor so as to drive the motor,
• the determining method comprising:
• obtaining, regarding a certain period being each of the plurality of periods, time series data of the moving velocity, a physical amount related to the moving velocity, or the operation amount observed in the moving control of the carriage in the certain period, and identifying an index value regarding abnormality of the image forming system based on the time series data;
• and
• determining the end of the service life of the image forming system or the remaining amount of the service life of the image forming system based on a change of the index value over the plurality of periods.