Why is the tape player not working?

Whenever I try playing a tape, nothing comes out of the speakers. I haven't really tried much to get it working. BTW, this has been a problem for the last 7 years. I suspect there must be some sort of bad contact with the tape head, but I don't even know where to begin on disassembling this thing. And I don't know if you guys have any repair guides on it. So how do I fix it?

Edit: I found a disassembly guide here: Sony CFD-S70 Disassembly