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Unseen new symptom in 988 esl...fading
Unseen new symptom in 988 esl...fading
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Old 13th September 2018, 03:23 PM   #1
Manolo47 is offline Manolo47  Puerto Rico
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Default Unseen new symptom in 988 esl...fading

This is happening in the one speaker that had not given any problems. Music fades out and in. It starts playing ok and then the volume fades, then starts again like in a cycle. I do not believe it might be a bad panel issue maybe something to do with the electronics, any orientation will be appreciated
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Old 14th September 2018, 02:25 AM   #2
DAMIC is offline DAMIC  Serbia
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Switch the speaker cables to determine whether the problem is with electronics or speakers.
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Old 14th September 2018, 01:19 PM   #3
Manolo47 is offline Manolo47  Puerto Rico
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Done that and other checks, it is the loudspeaker!
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Old 14th September 2018, 09:08 PM   #4
AVWERK is offline AVWERK  United States
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Check the 1000uf /16 v cap. Sheldon says it can trigger the Triac and reduce output since they run this cap close to its rating and fail easily.

On my 988,s I used a 35v for margin.

Regards
David
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Old 14th September 2018, 09:23 PM   #5
MarcelvdG is offline MarcelvdG  Netherlands
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Broken connection in the high-voltage supply or between supply and panels maybe? Does it fade out very slowly in dry weather?
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Old 15th September 2018, 01:29 AM   #6
stokessd is offline stokessd  United States
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A clamp circuit problem with be instantaneous. Since it's happening slowly, my money is on a high voltage supply problem. I'd give the MOV in the front end the stink-eye.

I suppose the polyfuse could be going, but I've never seen one exhibit that sort of behavior.

Hope that helps,
Sheldon
quadesl.com
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Old 15th September 2018, 12:58 PM   #7
Manolo47 is offline Manolo47  Puerto Rico
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I’ll check and dutifully report ! Thanks!
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