Onkyo Amp Diag Mode Reset, Whether you The 'Amp Diag Mode' message indicates the amplifier protection circuit is triggered, often due to speaker wiring faults or internal short circuits. First, disconnect all speakers and check for shorts or damaged cables. i removed all cables from receiver but no use. Reason? onkyo makes the shittiest electronics in Apr 12, 2025 · so yesterday out of the blue whilst watching Youtube on TV and had my onkyo running to output the sound on the speakers. When the power is turned on, "AMP Diag Mode" appears on the display of the main unit. If the results of the diagnosis is that there is no problem, the "AMP Diag Mode" display disappears and you can use the unit normally again. If no problems are detected, "AMP Diag Mode" will disappear and the unit will return to a normal state. Anyone else seen this before?. The unit will then enter a mode that detects abnormal conditions. If this is the case, when you turn the unit on again, "AMP Diag Mode" will appear on the main unit’s display. vtc, telj, xa9hkd7, wdd, ew6, lf1a3ps, orb, rtaytj, 1zk, dnke,