Hi and welcome to JustAnswer,

Thank you for the question and your patience. Should you still need assistance for information purposes only...

Initially, the described symptom almost always indicate that the laser / optical pickup is unable to read the data off the discs. This could either be a dirty disc or a dirty lens or in some instances, the laser itself has grown weak.

Offhand, the only easy user doable try of a fix is to clean the laser lens using a cleaning disc for such purpose similar to the product shown HERE.

All others would require that the TEAC be opened up for visual inspection, voltage & laser emission measurements, confirm fault and effect repairs.

Should this be the case, are you then considering a DIY (do-it-yourself) repair approach? Are you familiar with electronic components, have access to / comfortable in the use of a multimeter and perhaps even a soldering iron/hot-air station?

Would either of the above be an acceptable approach and serve your purpose?

I understand and would appreciate an update when able.

Cheers.