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26th January 2011, 05:52 AM
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#1 |
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diyAudio Member
Join Date: Jan 2011
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RCA STAV-3990 Relay Buzing
I have had the RCA STAV-3990 for sevral years and in the last year it has started buzzing .. the buzing is coming from the reciver ( relays I think ) not through the speakers ... It does not buzz all the time .. this makes it verry hard to track it down ... It starts buzzing and by the time i get to the reciever the buzzing stops. any thoughts on how to fix this?
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26th January 2011, 06:07 AM
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#2 |
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diyAudio Member
Join Date: Oct 2008
Location: Wild North West...of England
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If the buzzing is a low frequency hum (about 60Hz), it is more likely that this is from the power transformer resonating due to: i)the frequency of the mains ii)the flimsiness of the bottom panel or the mounting screws being loose. Both of these cause the transformer and the bottom panel to resonate at an audible frequency. As the transformer heats up or as the current draw lessens, the transformer stops resonating and the buzzing stops.
To fix this you may want to try and re-tighten the mounting screws for the transformer (usually 4 in each corner of the metal frame it is in) or loosen them off, jiggle the transformer around a bit so it is in a slightly different position and re-secure it. |
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26th January 2011, 07:46 AM
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#5 |
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diyAudio Member
Join Date: Sep 2007
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Harmonics on the mains is common problem,
Toroid ~ grill interaction If it really is a relay that buzzes (Relay run on AC?) then this was similar, Swappin' Mech Power Relay for Solid State
__________________
------------------------------------------------------- A simulation free zone. Design it, build it, test it. |
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26th January 2011, 10:10 AM
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#6 |
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diyAudio Member
Join Date: Jan 2011
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What sux .. is when I am tring to get find the buzz it wont buzz .. been on all day ... has not happened once today .. did sevral times the day befor ... after listening to it when switching the power on and off .. I think the sound is comming from around where to big caps are ...
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26th January 2011, 10:25 AM
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#7 |
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diyAudio Member
Join Date: Jan 2011
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Ok .. If I keep messing with this I might just get it fixed .. if i loosen the powersuply and turn the power on and off the buzz is almost gone . so it looks like it is the power supply
Last edited by smv1978; 26th January 2011 at 10:39 AM. |
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26th January 2011, 04:45 PM
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#8 |
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diyAudio Member
Join Date: Sep 2007
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I think you will find it's down to the purity of the mains. Did you read this from the link in post #5 Although this mention toroids it applies equally to all constructions.
Mains DC and Transformers
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------------------------------------------------------- A simulation free zone. Design it, build it, test it. |
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