Sony Walkman D-SJ301 Personal CD Player "disc installed" Questions

...DISC PLAYER 00 THEN IT GOES DEAD.I KNOW IT IS GETTING POWER BECAUSE WITHOUT THE BATTERIES INSTALLED IT STILL LIGHTS UP. THANK YOU is it the right dc plug sounds like its not getting the right ...

...with the spindle trying to read but when the data is not read the drive shuts ddown with the no disc message. Try to clean the lens of the laser optical unit but if the fault persists then you ...

...DISC" MM-DT8, I CHANGE THE LASER AND THE MOTOR. Since you have changed the optical unit and the assembIy then we must come to the conclusion that the mother board is not processing the RF signals ...