There is a malfunction with the main unit's jog dial. Sometimes the CD ejects after being inserted. SONY Sony Multi Audio Player System MAP-S1 Main unit Remote control Power cable (generic) This item was purchased used. I have confirmed CD, Bluetooth, USB (memory/PC), LAN (home network), and external input to speaker output. I have confirmed recording from CD to USB memory. Radio has not been checked. When operating the main unit's jog dial, Sometimes it skips or moves in the opposite direction. Rarely, the CD would eject within a few seconds of being inserted. There are scratches and dirt, etc. There may be other undiscovered defects as well. Those who understand the condition, Thank you.