20 Most Recent Numark DM1200 DJ Mixer Questions & Answers

Once you make an authorized purchase you will be provided with a working serial number.

Try the following sites

http://www.powerstream.com/power2.html

http://www.platinum-records.com/Numark-21V-750MA-AC-Adapter-Power-Supply-prod7509.htm

Or even a cheap replacement laptop power supply as these usually start at 1000 mA which will give you current to spare and have a longer lifetime. most of these cover from 15V to 24V and are either auto switching or manual select for the voltage. Plus you can pick these up from most electronic / big box / supermarket shelves

All interconnected equipment MUST be powered from the same receptacle or source. The XLR to the speakers should NOT have ground lift. The power for the mixer should come from where the speakers are and be routed alongside the XLR cables. All the other connected items should also be powered by the same source. The ground bounce within a building cannot only cause noise, but can rupture the input circuits of equipment. As an electrical engineer I don't know why manuals supplied with the equipment doesn't go into this more. The professionals at the big venues all know this as they have had to pay to get equipment repaired.

Now to get down to "hiss" once you get the other stuff straightened out, there are two things to know at the start: The first is that due to the statistical nature in electronics "noise and hiss" are among the laws of physics that we can't completely get around. The level of the hiss should NOT be objectionable however. The second thing is that proper level setup is important to minimize the effects of noise and hiss. You should be sending the levels to the powered speakers at near full line level into the line inouts, never mic inputs that some have. Using excess gain at the speakers will amplify any noise pickup on your audio lines. Next, at the mixer, try to keep all the level controls around 10 to 2 0'clock for rotaries and 70% for faders. Excess gain at certain stages will cause hiss to be objectionable.

The typical cause of this is a failure of the buffer IC (usualy a 4558 or 4570). This is a relatively simple repair that should be easy for any audio repair shop. The part will cost about $2-$4.

Post your location and I may be able to refer you to a local shop.

Dan

i'm having the same problem, just wondeered if you found any solutions to this?

Often the cord has broken wires. First try to repair the power supply.

Also check the connector in the mixer as they can get damaged by side pulls of the cord.

Where are you located? Also, is the mixer the problem or is it the actual player that is not working?

Thanks,
Dan

Where did you connect the 12Vdc to ?

I like the Pioneer DJM-600

/it's most likely a defective fader, but before replacing it, get a can of Deoxit5 or fader cleaner and spray inside the fader, then move it the full length os travel about 20 times to see it that clears it up.

sure tons!!! most every music shop that I ever been in (and that's a lot !!) that sold instruments and stuff has either an in house tech or a "guy" they go to , ask em as they get perks for referrals

Most turntables require a new drive belt. The cartridge sometimes needs replacing. Cahngers require much more maintenance. Hardly anybody does this anymore... but if belt has deteriorated, that is DIY as you can find suppliers of the belt online.