Pioneer DJM-850 - WTF? |
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216 |
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Posted: 01 October 2014 at 7:10pm |
Ok, just got one of these gems on the workbench. The owner reckons that it never worked properly from new - so why he never returned it to the supplier is beyond me, but he does have/run several venues, so there ya go...
What I noticed immediately is that the XLR outs are not working properly - PIN 2, supposedly hot, is not giving anything, while PIN 3 is severely limited (to about 0,5v) and distorts badly on the positive cycle when pushed (same on both channels). Meanwhile, all the other outs work fine. I found the schematics and am working through the circuit - but the friggin´ sms devices are driving me mad. Anyway - what really got me posting this, was that the desk seems to have some serious phasing problems. I wanted to check whether PIN 3 really was cold, so plugged in a signal generator and compared the input and output. To my surprise, varying the frequency showed some serious phasing problems. Is that normal? Are these desks a piece of shit? Am I wasting my time and destroying my eyesight for nothing? Any comments? |
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Earplugs Are For Wimps!
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geoSal
Registered User Joined: 05 July 2011 Location: THESSALONIKI Status: Offline Points: 338 |
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my guess is that perhaps someone ran 48volts phantom into its xlr outputs and fried them.Xlr are the only outs on the mixer that phantom can pass through.
We had a similar problem with a pioneer 600 which is indeed a piece of shit.Same with and A&H 92 which distorts before even clipping on the outputs.Usually someone plugs mixers in a small desk which carries some active di's or mics that need phantom power.Without notice the mixer sends 48v to all the mic inputs and there you go.. As I said that is just my guess. |
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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4947 |
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the djm is a digital desk isn't it so I suppose you're going to get some minor latency when scoping in and out.
It's a pretty standard club mixer in these parts and I've never noticed any problems on the bench or in use, and I've had quite a few beered and blown. But it's complicated so I guess you could get some pretty weird faults given the signal paths. Edited by kedwardsleisure - 01 October 2014 at 10:51pm |
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Kevin
North Staffordshire |
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Earplug
Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216 |
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Yes, I suppose latency could explain some of that, but all the shifting about seemed extreme. It did make me wonder if there wasn´t something (fundamentally) wrong further down the line than just the XLR output circuitry.
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Earplugs Are For Wimps!
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Tarkovsky
Young Croc Joined: 30 June 2011 Location: Limehouse (LDN) Status: Offline Points: 513 |
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I can confirm that the DJM800, DJM850 and the DJM900 'don't have it'. I was really dissapointed by the DJM-900 as I had been considering getting one on stock, as DJs do ask for them. I'd hoped, perhaps foolishly, that pioneer might've upped their game a bit. I've yet to hear a 2000, but I'm presuming much the same. Basically they're a big box of blinking lights designed to amuse the user more than the crowd, because it's not the listeners who buy them. AH have a laughable reputation for sounding better amoungst DJs. On experience they're just as bad, if a bit harder to clip. They all belong in toys r us, or a skip.
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