Spring popped off after tear-down
"Teenietech , Open the tear down link below. Go down to step 3, click on the second image so it displays larger, now click on the magnify glass in top left of pic., now drag magnifier down to large grey drive wheel being driven by belt and click to magnify that area. To me it looks like you can barely see the loop of a spring attached to the discolored plastic lever and running under the grey drive wheel. Maybe not, but have a look. Good luck.
I hope this helped you out, if so let me know by pressing the helpful button.
Sony Walkman WM-4 Teardown"
Hey man, i just bought a wm-4 . And same thing happened. It’s the door spring. Look where the door hinge is and apply the spring in that door hinge hole and the hole next to it by the brown card. You are gonna have to figure it out how to do it. It’s pretty difficult to put back. But it’s worth it. Goodluck.
Hi! Were you able to fix this? I have the same problem and luckily I have the spring with me, it's just that I don't know where to put it