Image forming apparatus capable of reporting information regarding abnormal section of conveying belt and reporting method

An image forming apparatus comprising:

• a conveying belt configured to convey a sheet;
• an ink ejection portion configured to eject ink to the sheet conveyed by the conveying belt;
• marks provided on the conveying belt at an interval defined in advance along a circumferential direction of the conveying belt;
• an imaging portion configured to image the conveying belt;
• a rotation processing portion configured to rotate the conveying belt at least once and bring the conveying belt to a stop;
• a sensing processing portion configured to sense an abnormal section of the conveying belt using the imaging portion while the rotation processing portion is rotating the conveying belt;
• a count processing portion configured to count a number of the marks that pass by an imaging position by the imaging portion until the conveying belt comes to a stop from the timing at which the sensing processing portion senses the abnormal section;
• and
• a report processing portion configured to report, in a case where the sensing processing portion senses the abnormal section, sensing of the abnormal section and a result of counting by the count processing portion after the conveying belt comes to a stop.