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Legato 3.1 distortion
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ezzy  
#1 Posted : Tuesday, January 3, 2012 1:36:33 AM(UTC)
ezzy

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Hi,
after several months of sweet music from my BII, I noticed quite heavy distortion in the sound.
It suddenly appeared.
I try to change different sources, but the problem remains.
I check the power on Placid BP_HD, TP_CCS=380mA, TP_Shunt=180mA on both rails. Output voltage is set to 13,5V.
When is no sound from source, I get no distorsion. It is present only when the music is playing.
I belive, that Legato is the source of the trouble.
What are the first steps for troubleshooting this issue?

regards
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ezzy  
#2 Posted : Thursday, January 5, 2012 1:58:56 AM(UTC)
ezzy

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Should I start with coupling caps?
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Russ White  
#3 Posted : Thursday, January 5, 2012 5:44:33 AM(UTC)
Russ White

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Well it might not hurt, but if you needed them you would have needed them from the start - unless something changed in the setup.

I would look for anything that might have come loose or a weak solder joint etc. Is it only from one channel or both? Does swapping channels have any effect?
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ezzy  
#4 Posted : Thursday, January 5, 2012 5:56:37 AM(UTC)
ezzy

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I think, that I eliminate the possibility for cold solder joint, because I allready resolder everything.
The last thing I done, was connecting QN2,QN3 and QN5,QN6 for thermal conntact.
Changing channels dosen't have any impact, since distortion is present on both channels.
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avr300  
#5 Posted : Thursday, January 5, 2012 11:22:39 AM(UTC)
avr300

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Post a picture if you can.
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ezzy  
#6 Posted : Tuesday, February 14, 2012 12:31:11 AM(UTC)
ezzy

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Update.
I manage to resolve this issue.
When I replaced wireing with silver wires, I made "stupid" mistake and swap GND and SE output on both channels.
Thank you for all for the support.
regards
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