Sony STR-DE485... | Answered on Mar 25, 2018
Sony STR-DE485... | Answered on Sep 28, 2013
Sony STR-DE485... | Answered on Apr 17, 2013
Sony STR-DE485... | Answered on Jul 25, 2012
Sony STR-DE485... | Answered on Apr 16, 2012
Sony STR-DE485... | Answered on Jul 15, 2011
Sony STR-DE485... | Answered on May 29, 2011
Generally speaking, an amp protects itself from heat, shorts and overloads by refusing to turn on or stay on.
Overloads can be from excessive periods of high output and shorts would be wiring issues or a speaker blowing up.
You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.
If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.
If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced hands-on tech.
Sony STR-DE485... | Answered on Feb 05, 2011
63 questions posted
Usually answered in minutes!