| 摘要 |
<p>PURPOSE:To confirm the quality of dubbing by storing a monitoring state at the time of detecting power failure, keeping the storage by a backup power source, reading out the stored contents when the power source is restored and returning a display to what is before the power failure. CONSTITUTION:It is detected by a power failure detecting circuit 5 that the power source becomes off, and a latch signal 10 is outputted to a memory circuit 6. A VTR abnormality signal 8 is given to a D terminal of the circuit 6, which is capable of storing it in timing of rising the signal 10. In other words, the state immediately before the power source is off is stored. The circuit 6 is operated by the backup power source 7. When the power source becomes on, a VTR mechanism 11 is stopped by a microcomputer 2. Since a storage data 9 is monitored by the computer 2, the storage contents of the circuit 6 are also checked. If the data is abnormal, an abnormality display lamp of a display part 3 is lit. By this method, a defective tape recorded by dubbing is easily sorted out.</p> |
