Use the following cleaning procedure after about every 20 hours of operation.

1.Remove the batteries and disconnect any other power source.

2.Open the cassette compartment door.

3.Use a pointed object to gently push the erase protection tab sensor to the left, then press REC to expose the tape-handling parts.

4.Use a swab dipped in tape head cleaning solution or denatured alcohol to gently clean the tape-handling parts. For easier cleaning, use an microcassette cleaner kit which includes a special cleaning cassette.

5.When you finish cleaning, press STOP/EJ and close the compartment.

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Radio Shack 43-476, TRC-300 owner manual