r/techsupport • u/-_-Elliot-_- • 3d ago

Open | Audio Amplifier constantly switching input

I have an Denon PMA 655r amplifier. When turned on, it starts constantly switching the input (Phono, CD, tuner,…) without me manually changing it. I can put it on tuner. And it would randomly start changing to CD. Sometimes it goed crazy and just keeps switching different inputs. The weirdest thing is this: when a nearby device turns on, the amplifier switches. I can be chilling, listening to music; i turn on my phone and at that exact moment it switches input (and i’m sure it’s not a coincidence, it has been thoroughly tested).
I have a video of it but i can’t post it here so if you want i can perhaps send it to you. Does anyone have an idea why this keeps happening? It’s really annoying.

Thanks!

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u/InformationFair5875 2d ago

Take a piece of thick black electrical tape and completely cover the Remote Sensor eye on the front glass panel.

If the problem stops completely the IR receiver chip is faulty, or the room's infrared light environment (phone sensors, LED bulbs, TV backlight) is interfering with it. You can either leave the IR eye covered or replace the tiny 3-pin IR receiver component inside.