Cassette recorders work with tape heads to read the analog audio signal on the tape. Because tape is moving over the heads whenever the deck is in use, the build-up of dust and dirt over time can cause recording and playback problems with distorted or inaudible sound. Tape heads also need to be demagnetized periodically for similar reasons. Magnetized tape heads can devour a delicate cassette tape, dragging the tape into the machine where it becomes entangled on the rollers and other moving parts. This often ruins the cassette. Demagnetizers and tape head cleaners are available at electronics stores. Warnings Writer Bio
