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HELP HELP HELP - Just blew my amp, can't afford a new one.
HELP HELP HELP - Just blew my amp, can't afford a new one.
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Old 9th February 2018, 04:12 PM   #1
nannoo is offline nannoo
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Default HELP HELP HELP - Just blew my amp, can't afford a new one.

Hi Guys, my only amp currently is a Denon AVC A11SR.

I just accidentally shorted the output of one channel somehow whilst swapping speakers (rather stupidly i did this live)

Anyway, whilst pulling the speaker cable out of the red output terminal the cable came into contact with the amplifier housing, accompanied by a loud bang and spark, then a chemical smell.


I'm about to open it in search for burnt component(s). The amplifier turns on but when the power stage relays kick in it goes straight back into protective mode, which I hope means the protection kicked in fast enough to confine damage to the power output.

Don't really know where to start other than open it up and take a look, any and all advice is gratefully received.
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Old 9th February 2018, 04:20 PM   #2
Project16 is offline Project16  France
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I am not a technician but if the protection output is activated is that you have a DC voltage present, I will say that the power transistors are HS.
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Old 9th February 2018, 04:21 PM   #3
nannoo is offline nannoo
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HS? I should say I've got it open now, no sign of where the damage is despite the smell which is somewhat irritating - can't see any damage, it's clear which amp channel is potentially shorted but not clear if there's damage on that board or at the PSU stage

Last edited by nannoo; 9th February 2018 at 04:25 PM.
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Old 9th February 2018, 04:25 PM   #4
SVI2004A is offline SVI2004A  New Zealand
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HELP HELP HELP - Just blew my amp, can't afford a new one.
You egg.

Check voltages at emitters of output devices or Emitter resistors, or inductors...

I’d definitely track it back from the effected channel output...

MN/P 1715 are based on SanKen MT200 devices... (takes something stupid to kill one)

I haven’t heard antone yet come back on hFE of them, there are non ******** options (seen what Denon charge?!)

The SM is on Hifi engine, use that to check locate output voltage on relevant channel

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Old 9th February 2018, 04:26 PM   #5
rayma is offline rayma  United States
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Quote:
Originally Posted by nannoo View Post
The amplifier turns on but when the power stage relays kick in it goes straight back into protective mode
First unplug and check all the internal fuses. Maybe you were lucky.
Denon AVC-A11SR - Manual - Audio Video Surround Amplifier - HiFi Engine
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Old 9th February 2018, 04:31 PM   #6
SVI2004A is offline SVI2004A  New Zealand
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HELP HELP HELP - Just blew my amp, can't afford a new one.
What speaker output was shorted...I’ll try n speed up exactly where to check
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Old 9th February 2018, 04:48 PM   #7
nannoo is offline nannoo
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Quote:
Originally Posted by SVI2004A View Post
What speaker output was shorted...I’ll try n speed up exactly where to check
Shorted speaker output was Front L

I should say that though i have basic electronics skills I'm no electronic engineer, i design speakers not amplifiers!

All I can tell you so far is that there's still a voltage output to the amplifier boards from the PSU so at least the PSU isn't blown - i think everything points to the front left channel being blown somehow, though I will check fuses now

(no blown fuses)
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Old 9th February 2018, 04:49 PM   #8
SVI2004A is offline SVI2004A  New Zealand
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HELP HELP HELP - Just blew my amp, can't afford a new one.
Seems there is a fast checkpoint available on each channel.... these all should be 0V or close to with reference to ground...
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Old 9th February 2018, 04:52 PM   #9
nannoo is offline nannoo
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I am wondering if my best option is to physically disconnect the power channel that is blown? Or will that cause the amp to fail again?
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Old 9th February 2018, 04:52 PM   #10
SVI2004A is offline SVI2004A  New Zealand
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HELP HELP HELP - Just blew my amp, can't afford a new one.
Check voltages between Ground and either pin on the side of TP101.... Of not 0V there is a fault
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