fronts but no sorround on my hardon ampifer

mrlennon · 11th August 2006, 12:40 PM

hi,

i have a hardon karmon avr 507, 7 channel amplifier.

i recently fixed it by replacing the power transistors, it was working perefect for about 2 months, then i recently noticed when i swiched it on, there was on a tiny amount of smoke ( bearly see it)

then i noticed the amp would not power up, on inspection i found out the surround back right channel the d2560 power transitor had shorted so i replaced the d2560 and also the b1647 transistor for that channel.

rhe amp now powers up fine but, i noticed i have sound on front left and right channels, but on the center channel as well as all surround channels there no sound.

well there is sound sort of let me descibe,

if you say go onto the radio a none broadcast station, if i turn the volume up full there you can hear the hiss from the surrounds the hiss gets louder when you turn volume up, so it kinda makes me think theres amplifaction just no source getting through?
heres a sound clip i recorded of the recever up full on one of the surround channels.
Click here to watch amp-volume-up

i also noticed if i put the amp on surround test i hear a sort of buzz sound, which goes through a 1 sec cycle then repeats, as it goes through each sorround test channel which ?
heres a soundclip i recorded of the buzz when it goes through each surround channel, when the recever is on surround test and speaker connected to one of the surround channels outputs,
Click here to watch buzz-between-surround-channel-test

anyone please lend a hand and advize.

mikeks · 11th August 2006, 01:40 PM

Quote:

Originally posted by mrlennon
..........hardon karmon........

O, the Humanity!

mrlennon · 11th August 2006, 03:22 PM

all fixed i managed to track down the problem

jaycee · 11th August 2006, 08:38 PM

Yes, i read this thread solely to see if it was an unfortunate mis-spelling of "Harman Kardon" or not

anatech · 11th August 2006, 11:33 PM

Hi mrlennon,
Tell us what you found out please.

All joking aside, don't post a picture.

-Chris

poobah · 11th August 2006, 11:52 PM

Darn! I'm late...

I won't... I promise, I won't...

anatech · 12th August 2006, 12:02 AM

Hi poobah,
Considering how late I started today, how'd I beat you to this???

poobah · 12th August 2006, 12:18 AM

I actually had to go somewhere today...

But I'm NOT going to say ANYTHING about hardon amplifiers.

bikehorn · 13th August 2006, 05:41 AM

alcohol tends to be a bit of a hardon amplifier at a good party.

er...

rpapps · 13th August 2006, 05:55 AM

Evidently not at the sort of parties Shakespear went to.

"it provokes the desire, but it takes away the performance" (Macbeth II, 3).

Cheers
Rob

11th August 2006, 12:40 PM	#1
mrlennon diyAudio Member Join Date: Mar 2005 Location: uk	fronts but no sorround on my hardon ampifer hi, i have a hardon karmon avr 507, 7 channel amplifier. i recently fixed it by replacing the power transistors, it was working perefect for about 2 months, then i recently noticed when i swiched it on, there was on a tiny amount of smoke ( bearly see it) then i noticed the amp would not power up, on inspection i found out the surround back right channel the d2560 power transitor had shorted so i replaced the d2560 and also the b1647 transistor for that channel. rhe amp now powers up fine but, i noticed i have sound on front left and right channels, but on the center channel as well as all surround channels there no sound. well there is sound sort of let me descibe, if you say go onto the radio a none broadcast station, if i turn the volume up full there you can hear the hiss from the surrounds the hiss gets louder when you turn volume up, so it kinda makes me think theres amplifaction just no source getting through? heres a sound clip i recorded of the recever up full on one of the surround channels. Click here to watch amp-volume-up i also noticed if i put the amp on surround test i hear a sort of buzz sound, which goes through a 1 sec cycle then repeats, as it goes through each sorround test channel which ? heres a soundclip i recorded of the buzz when it goes through each surround channel, when the recever is on surround test and speaker connected to one of the surround channels outputs, Click here to watch buzz-between-surround-channel-test anyone please lend a hand and advize.

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11th August 2006, 03:22 PM	#3
mrlennon diyAudio Member Join Date: Mar 2005 Location: uk	all fixed i managed to track down the problem

11th August 2006, 08:38 PM	#4
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	Yes, i read this thread solely to see if it was an unfortunate mis-spelling of "Harman Kardon" or not

11th August 2006, 11:33 PM	#5
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi mrlennon, Tell us what you found out please. All joking aside, don't post a picture. -Chris

11th August 2006, 11:52 PM	#6
poobah diyAudio Member Join Date: Nov 2005	Darn! I'm late... I won't... I promise, I won't...

12th August 2006, 12:02 AM	#7
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi poobah, Considering how late I started today, how'd I beat you to this???

12th August 2006, 12:18 AM	#8
poobah diyAudio Member Join Date: Nov 2005	I actually had to go somewhere today... But I'm NOT going to say ANYTHING about hardon amplifiers.

13th August 2006, 05:41 AM	#9
bikehorn diyAudio Member Join Date: Aug 2004 Location: toronto	alcohol tends to be a bit of a hardon amplifier at a good party. er...

13th August 2006, 05:55 AM	#10
rpapps diyAudio Member Join Date: Jul 2004 Location: nowhere of interest	Evidently not at the sort of parties Shakespear went to. "it provokes the desire, but it takes away the performance" (Macbeth II, 3). Cheers Rob

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