Image forming apparatus diagnosing print head and optical system conditions based on printed test pattern

摘要

An image forming apparatus which can detect a defect in a nozzle and an optical system, and inform an execution of maintenance.The apparatus comprises a scanner which reads an image; a print head which prints an image; a test pattern image data ROM stored a test pattern; and an image processing unit which diagnoses a defect in the print head and the scanner by processing data of the test pattern which is read by the scanner.