| 摘要 |
PURPOSE:To prevent abnormal writing on a recording medium due to logical malfunction such as power break, and also to protect the recording medium, by providing a circuit delaying write operation and that which cuts off a write current on detecting an abnormal state. CONSTITUTION:A WRS signal indicating the write mode of a unit is inputted to NAND circuit 11 and NOR circuit 12 through terminal 1. Further, a GOI signal indicating the operation instruction of the unit is inputted to NAND circuit 13 through therminal 2. Furthermore, a parallel circuit of capacitor C1 and resistance R1 is connected to the other input side of NAND circuit 11 to form a delay circuit. An output signal from NAND circuit 11 is inputted to NOR circuit 12 and an output from NAND circuit 13 is inverted by inverter 14 and sent out from terminal 3 as a GO-IN signal, the operation instruction of a write logic part. As a result, if the unit is put into a write state due to malfunction of a logic, the power supply is released by using the delay circuit and a switch circuit such as a relay, so that information files can be protected. |
