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Re: Turning volume up on my Denon AVR-485 AMP causes it...
When speaker systems A and B are used separately, speakers with an impedance of 6 to 16 ohms can be connected for use as front speakers
Be careful when using two pairs of front speakers (A + B) at the same time if their impedance is less than 12 ohms.
The protector circuit may be activated of the set is played for long periods of time at high volumes with an impedance lower than specified are connected.
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zone 2 volume can be adjusted by zone2 remote control (small one which came with the unit) or by main remote control if you switch it to zone2 mode. My main rem control has a slide switch i have to put in zone 2 position to operate zone 2 amp.
Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.
Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; 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 'nekkid'. 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 and competent hands-on tech.
Is the red light flashing at first?
The unit may be going into protect mode. Lets hope it has done the job and the receiver has protected itself from failure. Protect mode can result from speaker wires touching each other or the Amps metal case. Check that first. It can also be caused by unstable ohm loads if too many speakers are connected to any of the outputs especially zone 2. If you can remove all speaker wires and turn the unit back on. If it stays on, turn the volume down on the main zone and zone 2 if connected. Then reconnect speaker wires.
Logitech recommends that zone 2 is controlled using device mode on your Harmony remote. Controlling zone 1 and zone 2 simultaneously within activities may lead to the AV Receiver turning on and off unexpectedly as you switch between activities. For example, if you try to turn on zone 2 within an activity, it may turn on or off zone 1 and vice versa. Controlling zone 2 in device mode will prevent this from happening.
THe easiest way to hook an iPod or any other personal audio player to almost any audio receiver is to pick up a cable having a stereo miniplug (like the plug on your earbuds) on one end, and two RCA plugs on the other end. You should be able to get this cable from almost any electronics or discount store for under $10. The miniplug goes in the iPod's earphone jack, and the RCA plugs connect to an unused input on your receiver. Inputs marked "AUX" or "CD" are a good choice, or even a "TAPE" input. Set the iPod to about 3/4ths volume and adjust the receivers controls for desired volume.