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.
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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