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Consumer Electronics by S. P. Bali

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ERASURE GUARD

Most recorders now incorporate an erase prevention device which automatically ensures that pre-recorded cassettes cannot be accidentally erased by recording over them. The system uses a mechanical interlock with the record key or button, and is operated by a spring-loaded plunger at the back (opposite the heads) of the cassette holder.

 

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Fig. 10.34 Erase prevention mechanism

 

With no cassette in place, the plunger is extended, and the lever connected to it internally locks the record control. When an un-recorded cassette is placed in the holder the back of the cassette presses the plunger in, unlocking the record control. Pre-recorded ...

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