Press the button once while continuing to hold the other two.
đŸ’¡ : When searching for parts or diagrams, remember that the AVC-A1SE is often listed alongside the AVR-5800 in service documentation, as they share the same internal circuitry. Denon Avc-a1se Service Manual
Tracing audio signals through the (Dynamic Discrete Surround Circuit). Analyzing the high-current power supply rails. Press the button once while continuing to hold the other two