With most cameras you just push it once, and then start rewinding. In your case, test the rewind device. Do this when the camera is not loaded with film. To test it, open the film compartment, and try rewinding. If the beam that holds the film does not reverse, it is likely broken or in need of servicing. You can also test if the eject button pops in properly, and pops back out when the shutter is released.

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