| 摘要 |
PURPOSE:To make accurately the action of a film exchanger by comparing the test pattern of an ROM and the test pattern of an RAM that stores the state of action when an electric power source of the film exchanger is cut off and coping with turning on of power source again. CONSTITUTION:The film exchanger is process controlled by a microprocessor 201, and power source is cut off responding to detection of voltage drop of the power source. At this time, the state of action of the film exchanger is written in a state of action storage area 214 of an RAM203 in which a test pattern 213 of an ROM connected to a battery back-up circuit 206 is written. When the power source is turned on again, the processor 210 compares the pattern 213 with a test pattern 215 written in the RAM203, and if they do not coincide, it is judged that back-up of the RAM203 is defective. An alarm lamp 209 is lit, and the processor 201 is interrupted, and the film exchanger is set to initial state and the action is made accurate. |
