If you own a TC-WR535 which cassette decks won't open anymore, it's probably because the belts of the motor are in bad shape. I'm now gonna show you how to replace them.
Step 1: Tools you will need
These are the tools you will need:
a container for the screws so you don't lose them
replacement belts (2 for each deck, so a whole replacement set contains 4 belts, 2 small ones and 2 larger ones)