Bypasses all DSP chips to route analog inputs directly to the power amp, isolating whether an audio issue is digital or analog. COAX/OPT CHECK

Complex wiring diagrams of individual printed circuit boards (PCBs), detailing resistors, capacitors, transistors, and integrated circuits (ICs).

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The large storage smoothing capacitors in the audio power supply hold high-voltage charges long after the unit is unplugged. The manual recommends waiting at least 5 minutes post-unplugging and verifying voltage dissipation with a meter before touching internal components.

The Yamaha RX-A2A service manual is a detailed document that covers a wide range of topics, including:

before opening the chassis to discharge stored electricity in the capacitors.