Hi guys, I recently picked up a Technics ST-Z400 tuner. It powers on and receives stations well on FM and AM but I don't think it's getting any FM stereo. Neither the stereo nor the Quartz lock light ever come on. They are both leds and I don't think either one of them are burnt out. Any ideas? I don't have an owner's or service manual for reference so I'm kind of stuck. Thanks!