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Protective mode on receivers

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Dima R.

Member
My 2 audio receivers !! went into protection mode
Onkyo - TX-SR506 about a year ago, and just yesterday the newly purchased (about a year ago) Denon AVR-S760

What can go wrong ? I can't turn either of them back up. Does anyone have any suggestions ?
 
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First question would be what are you running for speakers and how are they hooked up?

Second would be what are the specs for the receivers you are using, what's the lowest ohm speakers they recommend?
 
Make sure there are no shorts in your speaker wiring. Disconnect them at the receiver and see if that changes anything when you power it up again. The protection circuitry looks at the speaker outputs and if any non-zero voltage is detected it goes into protection mode. Usually caused by a blown/shorted output transistor(s).
 
waggs098 said:
First question would be what are you running for speakers and how are they hooked up?

Second would be what are the specs for the receivers you are using, what's the lowest ohm speakers they recommend?
Click to expand...
Speakers are Bowers & Wilkins DM220. Connected as Front Left & Right (If this is what you are asking).
90 Ohms imeadence, I guess....

Both of the receivers are 75 Wats /channel
 
ranzim said:
Make sure there are no shorts in your speaker wiring. Disconnect them at the receiver and see if that changes anything when you power it up again. The protection circuitry looks at the speaker outputs and if any non-zero voltage is detected it goes into protection mode. Usually caused by a blown/shorted output transistor(s).
Click to expand...
How do I make sure ? I connected the wires. Seems safe and sound connections. Now, neither of the receivers come off protective circuitry without speakers. What would I be looking to in order to get them fixed ?
 
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So it looks like the receivers should be able to handle the speakers just fine. The B and W speakers are rated 8 ohm impedance.

Did you ever hook up or unhook the speakers from the receivers with them on?

Do you listen to them extremely loud?

Did both receivers go into protection while you were listening to them or did you turn them on and they were in protect?
 
waggs098 said:
Did you ever hook up or unhook the speakers from the receivers with them on?
Click to expand...
Umm .. Probably this might be the case .. Onkyo one I haven't used in about 1.5 years, so don't remember .. but the denon - it could be that it was on.
But it worked for some short while (20 minutes maybe) after I hooked things up. Then it happened.
 
So the receivers probably are to expensive to have someone fix them. Is the denon under warranty? That would be your best option.

So trying to figure out if you did something wrong to cause it so it doesn't happen again.

Hooking up speakers with power on is an extreme no no. With av receivers it only takes one small wire for a split second to short out and it will blow the finals. They are not like pro audio amps that can handle a direct short. Always make sure all wires look good before powering on. One small strand shorting from positive to negative or shorting to the case will be disaster.
 
waggs098 said:
With the Denon what was going on when it went into protection?
Click to expand...
I hooked up the speakers .. wrapping wires onto speaker connection nodes. Then turned it on and listened for 15-20 minutes.
Not loud - I am in the apartment building and it was .. 9-10 pm .. (I am cautious of the neighbor relationships..)
 
waggs098 said:
So the receivers probably are to expensive to have someone fix them. Is the denon under warranty? That would be your best option.

So trying to figure out if you did something wrong to cause it so it doesn't happen again.

Hooking up speakers with power on is an extreme no no. With av receivers it only takes one small wire for a split second to short out and it will blow the finals. They are not like pro audio amps that can handle a direct short. Always make sure all wires look good before powering on. One small strand shorting from positive to negative or shorting to the case will be disaster.
Click to expand...
Yea .. once I get through it, I'd buy a wires with connectors plug or something, so not to have to deal with the wires.
Wires are fine by the way, just .. "raw" so to speak ... so many loose hairs .. short circuit - that could be
 
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