Yamaha CD-S303 Owner's Manual

Connect the CD player's analog output jacks to the amplifier's input jacks using RCA cables. Ensure the left and right channels are correctly matched.
Ensure the disc is clean and free from scratches. Check that the disc is inserted correctly, label side up. Try a different disc to rule out disc compatibility issues.
Use a commercial CD lens cleaning disc or gently clean the lens with a cotton swab lightly moistened with isopropyl alcohol.
Turn off the power, then press and hold the "Stop" button while turning the power back on until the display shows "Initialize".
Regular maintenance, such as cleaning the exterior surfaces and checking cable connections, can be performed monthly. Lens cleaning should be done as needed.
The CD-S303 supports playback of CD, CD-R, and CD-RW discs, including those containing MP3 and WMA files.
Check that the RCA cables are properly connected to both the CD player and amplifier. Ensure the amplifier is set to the correct input source and the volume is turned up.
Use high-quality RCA cables and ensure the CD player is placed on a stable surface to minimize vibration. Keep the player away from other electronic devices to reduce interference.
Check for any obstructions blocking the tray. If none, try a power reset by unplugging the player for a few minutes, then plugging it back in and trying again.
The Yamaha CD-S303 does not require firmware updates as it is a standalone CD player without network capabilities.