Tech discussion > 4K,6K,8K Series

Dc offset pop sound on solo buttons and Console status buttons

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tlmaen:
Hi,
when i press any solo button on my 4ke console, I get an almost fullscales dc sounding pop.
Its really annoying, specially with clients attending.
When one solo button is pressed, pressing another solo doesnt make any additional sound.
Also when i change the status of the console it makes the same loud sound.
Is there anywhere to start looking?
(All of the center section cards are completely recapped).
I figured out that there is a cut bus, but that seems to be a logic thing.
Tried to identify the Pfl/Afl bus in the service manual, but that doesn’t shed any light in to it…

Thanks for your help!
Happy eastern  :)

tlmaen:
Tried to narrow down the Problem, so I powered the console with one bucket at a time, but no luck.
Even when all buckets are switched off, it still makes this pop sound.
So I guess its somewhere in the center section…

The VCA Solos doesnt make that sound.
Just the channel solos ant the change of the console status.

Any Ideas where to look?
I find the service manual not very helpful so far…

Thanks,
Tilmann

tlmaen:
No one any idea...?
Still a big problem and takes away a very important function.

I heard from an old tech guy it might have something to do with grounding.
He remembered all sorts of things when a console is moved to another location...

Thanks,
Tilmann

Clip6:
Can you zoom/facetime with good tech? Hate to see you still with this problem.

radardoug2:
There are clues here. First, if adding solos does not give the click, the click relates to when solo is first initiated. Second, its not in a bucket, it is in the main module where solo is controlled. So look at where the solo audio first enters the monitor chain. It would indicate a failed cap, putting dc into the audio chain. You will need the appropriate extender cards for modules in the centre section. You will need at least a scope. Then its faultfinding 101. Study the schematics, and then decide where to start measuring.

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