I just purchased a used model and there is no sound coming from the headphone jack. Also can't get any sound from the output.

Is this a common problem? I saw a post somewhere that talked about something getting shorted if you use the wrong power adapter? The unit came with a Panasonic adapter so not sure if that's it. Unit powers fine, seems to function otherwise.

I'll probably just purchase another unit unless there's an easy fix. If I do, is there something you can recommend that is similar? I like how compact this is. Truth is I only need ti for playback, not recording. I want to access some old 4 track recordings, dump them onto the computer.