| 摘要 |
PURPOSE:To extend a detection range, by a method wherein a printer device having a function converting an operation mode into a diagnostic mode is provided with a display part displaying a message and a ROM storing a diagnostic program required for the diagnosis of the printer device. CONSTITUTION:A program allowing execution of some basic operations is stored in a ROM 1 to conduct the diagnosis of a printer. In the printer being set to a diagnostic mode by a switch or a host device, the diagnosis control program in the ROM 1 is started to execute basic operations No.1-No.n. Then, messages corresponding to said respective basic operations are displayed by means of characters on a display part 3; if the judgement whether the result of the operation is normal or abnormal is possible in the printer device, the result of the judgement is also displayed as a message. In this manner, storing of the diagnosis program executing the basic operations in the ROM enables a cause of failure to be recognized under a visual recognition whether the result is normal or not, which allows the range detecting an abnormality in the printer to be increased without an increase of the abnormality detection circuit in number causing a higher cost. |
