Top 20 Sony STR-DE485 Receiver Questions & Answers

Use RCA Cables from the TT to the Aux in on the Receiver. You may need to use a pre-amp inline from TT to Receiver. http://www.bhphotovideo.com/ has a few.

are you sure what your plugging them into on the TV is an output? most of the red white yellow jacks on TV's are inputs not outputs. also on same thing on the receiver make sure its an input not output

1-683-763-11 is the p/n for the headphone board. Should be easy to replace. Just unplug the old one, take take the screws out, and put the new one in.

Protect on a sony usually means a short in the amp section. Would have to go in for repairs.

I recommend getting it checked out, the sooner the better, otherwise more damage to the system may occur.

Headphone jack is an output not input jack. Your going to need a cord to go from your headphone jack(output) of your phone to audio input on your receiver. The cord has a mini stereo plug to the phone and RCA plugs of left and right to your receiver auxiliary input. Good luck..

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 '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 and competent hands-on tech.

Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.

Generally speaking, an amp protects itself from heat, shorts and overloads.

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.

Internal dead short in pwer supply. needs service. Sorry for the bad news

hi,
if u are using bose speaker system then remember one thing. go to speaker setup and select all the speakers as large not small. then only u will get a good tone. bose speakers will handle the output power of ur amplifier.
u can only adjust the bass and treble of ur frond Channel speakers. for that
select multi channel surround sound and the increase and decrease the bass and treble
ok

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.

Unless you're trying to really crank it up, any speaker should work on almost any amp if the hookup is correct. If the impedance or such is off, that won't show up at low volumes and I assume your sound is bad at any volume. Look for Main Left and Main Right and start there. 4 wires - 2 speakers, not too hard. Select a simple stereo source (like a CD) and see how it goes. That will verify the amp/speaker setup (at least for those 2). If that doesn't work, there may be an internal issue in the amp which is why "someone" was getting rid of it.

Please see that your power suppy is working if not check this link:

http://www.fixya.com/support/r5826301-working_switch_mode_power_supplies

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Receiver say's "Protect" or turns on then off posted on Dec 13, 2009
MessageRate.ThreadID = 3632423; MessageRate.ProductID = 0; smarthome2
Rank: Guru
Rating: 88%, 432 votes

The most common problem found on FixYa for Audio Video Receiver's is:

My receiver say's "Protect" or turns on then off. What's wrong? Seven times out of ten it is a shorted speaker or speaker wire. To determine your exact problem, the first step is to disconnect all speaker wires "at your receiver" Next: Turn the receiver back on. If your receiver still says "protect" or turns off, it needs to be serviced. If your receiver stays on; reconnect your speakers one at a time and power back up after each speaker. You may find that after reconnecting all speaker wires it works! Most commonly the small braids of wire from the + to the - have touched and have caused the problem. In some instances, you noticed the problem only when turning the volume up. either way, make sure the exposed wires to your receiver are no longer than 1/2" long and are completely under the screw down terminal or slide in. When you've found the wire or speaker with the problem, your receiver will go back into "protect" At this point, disconnect the wire from the speaker at the speaker that may be causing the problem then test again.* Note* Make sure speaker wires do Not touch each other as this Will cause a short! If you turn the receiver back on and it stays on, you now know the problem is in your speaker itself. To test your speaker, you will need a multimeter. Set it to ohms resistance and touch the speaker terminals, if there is a short internally the meter will read "1......" If it's an analog meter, it will peg to the right. There's your problem. Now, within any speaker there are quite a few possibilities as to what could be causing the problem. Most common is a blown coil and the speaker needs to be replaced. Some speakers have internal crossovers (usually floor standing speakers) and may have a shorted or burnt board (usually very visible brown burn marks on the board) and can possibly be repaired if your handy with a soldering iron. Now, if you disconnect the speaker wire at the speaker and it still says "protect" Check your wire for the obvious cut or nail thru the wire if possible. If your system has wiring that runs behind walls, you may need to use your meter again. Disconnect the wire at both ends, keep the ends separated, put your meter on ohms resistance and touch probes to the + and - wires at one side. If the meter pegs to the right or reads "1...." the wire is shorted and needs to be replaced or repaired at the short. Hope this helps.

It sounds like the receiver is either failing or going into a thermal protection mode.

There should be NO reason why the input source (digital versus analog) should make a difference unless you play the digital sources obscenely louder than the analog ones.

If you suspect heat, you should be able to feel it.

Can you verify that the digital sources ONLY do this?

there is most likely a problem with the unit that keeps tripping the protection circuit there could be a short somwhere. it would have to be looked at by somebody, because without looking at it, it would be really hard to determine the cause of it.