| 摘要 |
<p>PURPOSE:To make restoration to an original state possible without damaging a head, etc., by disturbing main function by the control output of a storing means that stores timer output generated after a lapse of set time and generates control output. CONSTITUTION:A timer section 3 starts timer operation to a set time by operation of a start switch 6. In the meantime, output 106 of a servo disturbance adding section 5 disappears and the body of a VTR 1 operates normally. After a lapse of set time, the section 3 generates output 104 and makes a storage section 4 generate control output 105 and maintained in the state that can generate the output 105. On inputting the output 105, the adding section 5 generates output 106 in a servo circuit section and disturbs normal servo state. Thus, main function becomes disturbed state and maintained after the lapse of set time, and normal use becomes impossible. However, it can be restored to normal operation by specified process without damaging a tape.</p> |
