Sony TC WE635 Dual Cassette Deck problem. I’ve discovered the problem is with the belts. You can find a replacement set off of eBay. Below is a link to the service manual for this unit. Even if your unit is a slightly different model the general directions will likely be similar. Also provided your current unit doesn’t have any actual broken belts simply put your new replacement belts in the same location and placement as your old ones. While you’re at it you may want to clean off the tape heads and components with some alcohol using a Q-Tip.
Cassette deck service manual
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