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Dodgy EQ |
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concept-10 
Young Croc 
Joined: 17 May 2016 Status: Offline Points: 1293 |
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 Posted: 12 June 2016 at 8:30pm |
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concept-10
Young Croc
Joined: 17 May 2016 Status: Offline Points: 1293 |
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Posted: 12 June 2016 at 8:31pm |
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concept-10
Young Croc
Joined: 17 May 2016 Status: Offline Points: 1293 |
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Posted: 12 June 2016 at 8:34pm |
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Ok, took it apart again, removed everything, reassembled, working perfectly on both channels, did some eq settings and perfect, no hum no colour, then i moved it and the hum is back.
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fatfreddiescat
Young Croc
Joined: 15 October 2010 Location: N.E.Wales Status: Offline Points: 1083 |
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Posted: 12 June 2016 at 8:35pm |
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Check where the cables join the connector's especially the ribbon cable, if they are multi strand not solid core then that can cause problems as it does in the berry dcx.
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concept-10
Young Croc
Joined: 17 May 2016 Status: Offline Points: 1293 |
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Posted: 12 June 2016 at 9:25pm |
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All been off and sprayed and cleaned, will test every one with the meter now. cheers.
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Pinyorouk
Young Croc
Joined: 31 January 2011 Status: Offline Points: 551 |
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Posted: 12 June 2016 at 11:19pm |
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Possibly dry joints?
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Dutchman
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Joined: 23 March 2013 Location: GENT Status: Offline Points: 365 |
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Posted: 12 June 2016 at 11:38pm |
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Sounds like a grounding problem to me.
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We need more SPL!
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concept-10
Young Croc
Joined: 17 May 2016 Status: Offline Points: 1293 |
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Posted: 12 June 2016 at 11:40pm |
That's what i'm starting to think, will go through it all again tomorrow
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Earplug
Old Croc 
Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216 |
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Posted: 13 June 2016 at 11:36am |
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Most probably nothing to do with your hum problem, but +/-19V supply may be on the margins for the opamps. Maybe check the maximum supply rails for the ic´s you have in there. They might need a couple of volts trimming off that.
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Earplugs Are For Wimps!
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Dutchman
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Joined: 23 March 2013 Location: GENT Status: Offline Points: 365 |
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Posted: 13 June 2016 at 12:05pm |
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Especially, when you touch it and it goes away it means it has something to do with leaking electricity.
I would say disconnect the ground in the plug it self but this is quite dangerous. Altough here in Belgium this doesn't matter because we have 30mA and 300mA differentials. Measure somewhere on the board and on the case itself. You can also ground the chassis better. Hope I helped!
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We need more SPL!
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Dutchman wrote: