COPYING MACHINE

PURPOSE:To easily identify a unit which is set defectively by displaying the defective setting position of the internal unit of a copying machine at a position which is easy to see in normal in-use state such as a copy state display part. CONSTITUTION:The copying machine includes various internal units 10 to form a conveyance path, and an original and a form jams on the conveyance path possibly. A position sensor 66 which detects whether each unit 10 is mounted at its normal position or not is arranged at the normal position, and an abnormal unit is displayed on code basis at the copy state display part 33 of, for example, an operation part. The unit number of the defectively set unit which is displayed on the copy state display part 3 uses a number preset as, for example, part of a self-diagnostic item, and consequently it is easy to easily know which unit abnormality occurs to.