cassette player FF and FR but do not play, did replace belts?

Pioneer sterio double cassette deck amplifier Modle DC-Z92 is inperfict condition but the cassette players (x2) do not want to play.
The belts was replaced and if PLAY butten is pressed, the motor do run for a short wile but stop within a second and the cassette tape do not turn at all.
The cassette player do have a function to reverce the play direction without removing the tape, but both players in both directions do notwant to Play.
The unit wa bought new during the early 1992