Keep the rear cooling vents of the amplifier free from dust. Overheating can trigger the system's protection circuit and shut it down. ❓ Troubleshooting Common Issues Probable Cause Recommended Solution No power to upper units Loose system control ribbon cable. Turn off main power and firmly re-seat the ribbon cables. Humming sound in speakers Loose RCA cables or ungrounded component.
Locate the flat system control ribbon cables on the back of the units. sony lbt-d505 user manual
For everyday user settings, clock configurations, and basic hookups. Keep the rear cooling vents of the amplifier free from dust