Wrong playback direction of the car cassette player's autoreverse feature. Our car cassette adapter can only work in one playback direction. If it does not work in one direction, try to change the autoreverse direction of the car cassette player. * The car cassette player is equipped with a tape movement sensor. Philips car cassette adapters are limited to the use of car stereos which are not equipped with tape movement sensors. If the car cassette player has a LINE IN jack, please connect the signal lead between the LINE IN jack of the car cassette player and the LINE OUT jack of the CD player.