Power surge burnt my stereo amplifier?! - diyAudio
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Old 21st September 2013, 02:11 PM   #1
oszkar is offline oszkar  Romania
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Default Power surge burnt my stereo amplifier?!

Hy!

I am haviang a Pioneer A-602R Stereo amplifier!
Now two days ago I was on the net and while in a game I herd a sound in my amplifier that described is as if someone would mistakenly drop a PC screw into it , and afterwards there was no more sound!
I turned the amplifier off and restarted it 20 seccond later with the volume knob to the minimum set... still no sound! I switched speakers set, still no sound.
I switched to another source got the volume up to the middle and only at very near listening with the ear to the speakers there was sound at the surface on each source I comuted to.
Afterwards I disconected the speaker cords and done as following! Pulled out the source cable connecting the PC to the amplifier out of the amplifier and connected speakers A and B, and switched to the CD imput with the CD Player amplified to it, and went with the volume all the way to the maximum, when at one moment reaching maximum a relay decoupled inside, moved the volume all the way down and the relay coupled! Done the same on all other sources, volume up and down and the relay did not switch off no more!
What could it be? If it is the 96khz spike that comes from the internet as I heard that burt it what should I do? What type of external audio card should i buy? One of those usb sticks audio cards? One of those DAC type audio cards?
Is this fix expensive?
What should I watch out for in the future for?
How should or how should I connect the Ground from my amplifier and to what?
Would that help a little too? What with?
Thank you!
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Old 21st September 2013, 02:23 PM   #2
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Isn't that Pioneer Amplifier almost 20 years old?
I think that it failed due to old age.
If you have a large power surge, other items in your home will fail at the same time.
There are no 96kHz spokes from the internet.
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Old 21st September 2013, 02:33 PM   #3
FoMoCo is offline FoMoCo  United States
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Quote:
Originally Posted by Speedskater View Post
Isn't that Pioneer Amplifier almost 20 years old?
I think that it failed due to old age..
Maybe not. My 20 year old Pioneer is going strong while being (ab)used daily.

Quote:
Originally Posted by Speedskater View Post
If you have a large power surge, other items in your home will fail at the same time.
Not always. Some things are more sensitive to a surge.
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Old 21st September 2013, 06:17 PM   #4
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So on one hand you say that the Pioneer is a robust amplifier and on the other hand you say that it's more sensitive?
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Old 21st September 2013, 07:15 PM   #5
FoMoCo is offline FoMoCo  United States
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Quote:
Originally Posted by Speedskater View Post
So on one hand you say that the Pioneer is a robust amplifier and on the other hand you say that it's more sensitive?
Not at all. By things, I mean just that. A television is more likely to fail than a toaster from a surge. So it is possible that a surge would only damage one item. However, just because his amplifier is twenty years old does not mean it died of old age.
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Old 21st September 2013, 08:44 PM   #6
RNMarsh is offline RNMarsh  United States
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You need a power conditioner with surge protection.... Monster power and Panamax have very good ones.

Thx-RNMarsh
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Old 21st September 2013, 10:06 PM   #7
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Oszkar, do you have DC on the speaker outputs? More than a tenth of a volt or so is bad news.
If by contrast, a twenty year old electrolytic cap shorted and blew a rectifier resistor or fuse, you may have a much easier time of it.
See this thread for old amp repair instructions: vintage amplifier repair/upgrade manual
I find electronic equipment built before the MOS surge supressor was cheap, or cheaply built enough afterwards not to have one, to be more sensitive to power surges than resistance heaters and incandescent light bulbs. Most of the power surges we have in the states are caused by lightning. Systems with a local low-tech generator have a much less stable AC supply, especially if the local generator is switched in or out of the supply.
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Old 22nd September 2013, 09:44 AM   #8
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PIONEER A-602R A-702R SM Service Manual free download, schematics, eeprom, repair info for electronics
This design has microprocessor control of its major functions, switching, volume control etc. That means there is little point saying try this or that possibility if you cannot clear the fault settings which should have removed connections into and out of the amp and prevented serious damage. There is the possibility with power removed from the micro, and if there really was an almighty surge (And it would need to be the magnitude of a nearby lightning strike) that the programming is erased or corrupted.

Unless you have experience with microcontrollers and amplifier problem solving, don't mess with this without a lot of close support, if any is actually available. This is the job of a qualified or very experienced technician who knows these protection systems.

What was your approximate volume settings on a scale of loudest down to late night listening level and the total number of speakers and their nominal impedance values?
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Old 22nd September 2013, 09:48 AM   #9
AndrewT is offline AndrewT  Scotland
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Have you checked the fuse/s?
Fuses fatigue and eventually blow. That might be after a year, or 10years, or xyzyears.
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Old 23rd September 2013, 06:55 PM   #10
oszkar is offline oszkar  Romania
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Ian Finch

The volume was soft quiet there was no lightning as the weather has been just coming back to normal and the sound that I heard inside it was as dropping a screw into a computer case when mounting a drive into your PC, the speakers I had on were messured on a scale of 200 ohm with a multimeter, one at 6.8 ohm and one at 7.0 ohm
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