A method of removing photoresist film with high efficiency of removal and friendliness with the environment while reducing the material consumption and the cost for the ventilation facility, and an apparatus used for the method are provided. The changer generally includes a seat having a supply assembly positioned on one side and a takeup assembly provided on the opposite side. The data related to an operating system for running said apparatus is at least partly stored in said non volatile random access memory and the memory used by the operating system for operating said apparatus is at least partly said non volatile memory. Special processing involving the use of conventional and non-conventional grinding techniques and various filtration techniques enhance the compatibility of the MICR ink-jet ink with the ink-jet equipment, resulting in superior ink life and print quality. This configuration makes it possible for the comparing circuit to maintain capability of preventing errors, and at the same time, improve in capability of outputting a pulse having a same period as that of an input pulse having a short pause period. The one or more users may be selectable from a list presented to the user.