20 Most Recent Denon AVR-2311CI 7.2 3D Home Theater Receiver - Page 9 Questions & Answers

https://www.hifiengine.com/manual_library/denon/dcm-420.shtml Denon DCM 420 Manual Stereo Compact Disc Player HiFi Engine

The answer is probably yes. But there is probably a cheap replacement for it on E-Bay.

You should be able to feel if it is overheating. You can check the power output devices out to see if they are available and cheap to buy. Just look at the devices on the heatsink inside the unit and write down the numbers. Then look on Google for them. If they are hard to find or expensive you can expect a big repair bill. So that might steer you away from repair!

http://denon.custhelp.com/app/answers/detail/a_id/15/~/panel-lock This may not work, as it appears to be for a different model, but it states: How do I unlock the panel on my DRA-397? Power the unit off using the On/Off button. (not the larger On/Standby button) While the unit is powered off, press and hold the "Speaker B" and "Mode" buttons. Without releasing those buttons, power the unit back on. This will unlock the panel.

Hi. It's called a rotary encoder. You might get a replacement from Denon if you have soldering skills or can find a part number in the service manual. I'm unable to access the site just now: Denon UD M31 Manual Compact Disc Receiver HiFi Engine