If you are going to "protect" mode, usually one of two things is happending.
1) it is getting too hot
- make sure it has room to "breathe"
- make sure the fan is running.
2) One of your speaker wires has a short in it - this is extremely common
- check this by only hooking up one speaker at a time too see if you can determine which one is the culprit. If it is only happening with one, chances are thats your issue. If its happening with more than one speaker, chances are it is your receiver.
-check all your +/- connections to make sure you don't have any swapped from speaker to receiver.
- check your connections at both the receiver and the speaker, especially if you are using "bare wire" to connect and make sure no "strays" are there. A single stray strand will put your receiver into protect mode for sure.
Other things to check:
- Are your speakers too much for your receiver? 4 ohm, 6 ohm? Do a bit of research online, some speakers are rated a 6 but are known to drop to 4.
- Is there an indicator to show if your surge protector is grounded? If so, make sure it is.
- some surge protectors "starve" your reciever, bypass it and see if you still have the problem (at your own risk.
)
- If you have anything (DVD player, etc.) plugged into your receiver, plug it into the wall instead. If you have your subwoofer plugged into your receiver, that will do it too.
If all these fail to solve the issue, you very well could have a faulty heat sensor?
Here is a link to the latest firmware:
http://www.harmankardon.com/product_...name=AVR%20635
Good luck, issues like this can be maddening!
GL