Soundcraft Studio 24 Mixer problem
 

I have a problem with my mixer...

On 3 or 4 channels I don't hear any audio coming out of the channel unless I crank up the channel input gain knob all the way to max.

So I could have for example a cd player connected to one of the faulty channels but will not hear any output until I turn the input gain all the way to max, once I've turned it to max I can then get a signal even after it's turned back down until I power off the mixer until next time, where this problem re-occurs.

Has this ever happen to anyone else???

Sounds like the input pots need cleaning or replacing

I really hope thats what it is cause I have loads of those lying around.

Thanks, I will try that and see how it goes.

What if you use the inserts?

/Hugo

It sounds like an oxidized connector or switch or dry joint. I think if you pull out that channel and clean everything and check for dry solder joints you will get it working well again.

probably stupid answer but make sure you have it set to line input not mic. and also im guessing since its called "studio" mixer its probably +4dB and most likely the cd player is -10dB. thats the differance between pro and prosumer. that would cause you to crank the input pre's.

Many Soundcrafts I've owned have done that after a decade or so, especially the consoles made in the US. It's gonna be either a cold solder joint or a dried up coupling cap in the channel strip.

On three or 4 channels you have a problem? You don't have a pad depressed do you? Are the rest of the channels supplying normal output?

Take the CD player input into the 1/4 line jacks on the rest of the channels with the input control set the same on all of them and check to see that there are not any pads depressed. Set the sliders all to the same level and input the output of the CD player into all the channels noting the output level of each channel.
Note* For the sake of checking use only on channel from the CD player for example the right channel and do the test.

If you end up with low level outputs on any of the channels they are indeed in need of repair. This is not uncommon for this or any other mixer. I have repaired 100's of channels of this mixer and others. I doubt very much it will be a dirty input control but to check turn the control while noting the output level and check the display and see if the level changes correctly or if you loose it.

I think what he is describing is that the channel needs to be "kick started" with a really high level to get the crook connection/component to come good, after which the channel is ok for a while.

I have repaired a few channels of them myself, and have always found the input pots to be a weak link. I wonder if the US version used a different pot?