TEAC W-850R Double Cassette Deck

This deck is turning on. When press play then it is good it seems playing, but once you press forward button or backwards then it seems stuck and the even if press play, it doesn’t play and when press eject it is seems stuck. Then as i pull out the casette, turn the unit off then turn it on again, same thing happens again. Itbis ok to someone who knows how to fix it. Balance knob missing. It has it’s original box, but i will fold it for delivery.

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