| 摘要 |
PROBLEM TO BE SOLVED: To provide a disk-exchanging device capable of continuing driving, even if a power circuit fails. SOLUTION: Out puts of plural constant-voltage power circuits capable of supplying more electric power than total power required for operation are provided, so as to be also supplied to comparison voltage generating circuits 31-31, and the comparison voltage generating circuits 31-31 respectively generate comparison voltages by dropping the input voltages by a resistance dividing method, and supply them to the corresponding comparison circuits 33. Output terminals for outputting voltages lower than the voltage to be inputted to a DC/DC converter board are also connected to input terminals of reference voltage generation circuit 32 respectively, and the reference voltage generation circuit 32 respectively generate the input voltages by the resistance dividing method and generate the comparison voltages, and supply them to the corresponding comparison circuits 33. The comparison circuits 33 compare the comparison voltages applied from the corresponding generation circuits 31 with the reference voltages supplied from the reference voltage generation circuit 32, and supply signals to control device provided in an exchange operation part, when the former is not higher than the latter.
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