What damage have I done?

[Moonlight]

Hi

I have a Denon AVR 2105 receiver, and whilst trying out a different pair of front speakers I heard a fairly loud 'pop' shortly after the sound started when the sub kicked in. The receiver switched to protection mode and the power light started flashing. I checked the manual under 'troubleshooting' where it says 'Display not lit and power indicator is flashing rapidly' > speaker terminals are short circuited.

I checked the connections and damn…I had the wires around the wrong way on the receiver. After switching them around and trying it again, it kept going back to 'protection mode' / display off..flashing power light.

In the old days it might have been a blown fuse, but there is no external fuse to check.

I then tried 'initialization of the Microprocessor (reset') with no luck.

Waited a while for it to cool down, not that it was hot or even warm to touch, and tried again…no luck there either…I was hoping the pop might have been the internal protection kicking in and that once the wires were reconnected correctly…it would reset itself and work…..nup.

Ok…..any ideas as to what damage might have been done?….as it seems like a trip to the repairer. Does it sound like a major job…as I'm wondering whether I am going to pay dearly for my blunder??

Any assistance with this would be appreciated

Cheers

 

[mpompey]

A speaker wired out of phase (Negative -> Positive) is not the same a short circuit. An out of phase speaker should not damage your receiver, as the current is still flowing through the speaker and back into the receiver, albeit in the wrong direction.

A short is a condition when a wire touches another wire/conductor and the current bypasses its intended path (short) and begins to pull a large amount of current that can damage some or all of the components in the chain.

From what you describe sounds like a blown cap or transformer. Was there any smoke? Expect around $150 - 200 for an average repair. I'd go online and find an authorized repair shop and take it in and explain what happened.

 

[TLS Guy]

Hi

I have a Denon AVR 2105 receiver, and whilst trying out a different pair of front speakers I heard a fairly loud 'pop' shortly after the sound started when the sub kicked in. The receiver switched to protection mode and the power light started flashing. I checked the manual under 'troubleshooting' where it says 'Display not lit and power indicator is flashing rapidly' > speaker terminals are short circuited.

I checked the connections and damn…I had the wires around the wrong way on the receiver. After switching them around and trying it again, it kept going back to 'protection mode' / display off..flashing power light.

In the old days it might have been a blown fuse, but there is no external fuse to check.

I then tried 'initialization of the Microprocessor (reset') with no luck.

Waited a while for it to cool down, not that it was hot or even warm to touch, and tried again…no luck there either…I was hoping the pop might have been the internal protection kicking in and that once the wires were reconnected correctly…it would reset itself and work…..nup.

Ok…..any ideas as to what damage might have been done?….as it seems like a trip to the repairer. Does it sound like a major job…as I'm wondering whether I am going to pay dearly for my blunder??

Any assistance with this would be appreciated

Cheers

What do you mean by having the wires round the wrong way? There are a lot of possible combinations. By the sound of it however it sounds as you have done some serious damage.

I bet you have blown at least one amp output stage. I suspect the pop you heard was some type of TRIAC self destructing to short circuit the output to prevent huge DC voltage from the now shorted output devices blowing your speakers.

I see the MRSP was $649. I'm sorry to tell you that repair of that unit may not be cost effective, in fact it probably isn't.

If you had the +ve of one speaker connected to the +ve terminal and the -ve of the same speaker connected to the +ve of another channel, then that would blow two output stages for sure.