| 摘要 |
PURPOSE:To inform what kind of abnormality is generated, by generating an error data constituted of plural bits having the contents corresponding to an abnormality, and bringing a lamp to flickering control by making it have a lighting period which is different depending on '1' and '0' of the bit. CONSTITUTION:When a power source switch 3 is turned on, a CPU 1 starts a starting operation, but in this starting operation, whether a magnetic disk has been set normally, and whether a spindle rotates normally, etc. are checked by rotating the spindle. For instance, in case when an index pulse cannot be detected, even if the spindle rotates, due to a fact that there is an abnormality in the magnetic disk, etc., an error processing is executed by generating an error data '0010'. In such error processing, when the bit is '0', an output terminal P is set to a 250ms '0' level after setting it to a 250ms '1' level, and when the bit is '1', the output terminal P is set to a 250ms '0' level after setting it to a 500ms '1' level, and a light emitting diode 9 is brought to a flickering control by bringing a transistor 7 to on/off control. |
