Mixer Issue - Numark CM200usb

[Steve LeBlanc]

Noticed last night.....sliding master slider up and down...nise, "bumping"..pulsating hum....(once stoped it was fine...made it through the night). Tap on the slider....sounds like you're tapping on an open mic.

Same with the balance knob...turning it back and forth, thump at 12:00 and at far ends.....left in the middle...no problem..

Dirty slider? How to resolve?

Thanks

 

[SoftJock Rick]

If you have a compressor (or access to someone who does), you can blow it out, and usually don't have to take them apart. If you need to use those compressed air cans, you will probably have to open it up...

 

[Jeff Romard]

Noticed last night.....sliding master slider up and down...nise, "bumping"..pulsating hum....(once stoped it was fine...made it through the night). Tap on the slider....sounds like you're tapping on an open mic.

Same with the balance knob...turning it back and forth, thump at 12:00 and at far ends.....left in the middle...no problem..

Dirty slider? How to resolve?

Thanks

Sounds more like a ground problem especially where its more than one knob. I would try cleaning first but I would have a backup on hand just in case

 

[DJ JohnThe1]

I would try the air spray. It may only be a temporary solution. You may have to replace the slider.

 

[Steve LeBlanc]

Luckily - I don't have a gig til the end of June......This reinforces the need not only for a back up, but the ability to swap over quickly (cables prepared, etc....)