DJM-600: Output fault + general service |
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eltron
Registered User Joined: 21 December 2007 Location: Finland Status: Offline Points: 399 |
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Posted: 09 April 2011 at 4:06pm |
Hello all,
As the topic says, I have a dreaded DJM-600 sat here that (apparently) has an output fault: The right channel is dead on the master output, both balanced and undbalanced. (Master 1 & 2) The owner couldn't say what has happened nor in which circumstances. Pfly suggested it might be a case of phantom power damage? Haven't got round to testing it myself yet though, but I'd appreciate it if someone could point me in the right direction: Where to look and if there are any obvious points in the signal chain where damage could occur. Pointers on what else to check or look out for and possible modifications are also welcome! Cheers! -Ville (edit: spelling)
Edited by eltron - 09 April 2011 at 5:10pm |
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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4938 |
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Could be something as simple as the master fader or trimpot open circuit on one channel. Does the output meter show both channels present?
Check for beer damage, the tracks are very fine and soon rot through if beer is left on them. Failing something simple like that, it's time to inject a signal and trace it with the scope. |
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Kevin
North Staffordshire |
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eltron
Registered User Joined: 21 December 2007 Location: Finland Status: Offline Points: 399 |
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Thanks for the quick reply!
Just got a chance to fire it up and take a closer look at the problem. All channels are fine, no crackles and full clean sound through headphones and booth out. Through the main outputs (both 1 and 2, as i stated earlier) the left channel was damped, only a minimal amount of HF present with the main output cranked, right channel gave a healthy signal, a bit distorted though, there was a few nasty crackles on the left channel when i cycled the main fader without audio through. Both channels were present according to the main output meter, checked this through all channels, just to be sure. Seemed like the problem would be the master fader, as you suggested. But: I decided to try decreasing the main output level which seemed a bit too hot by adjusting VR on the rear. It was, of course, set to full and when I turned it down (after a nasty pop) the output returned to both channels, no crackles no nothing, not even on the main fader, clean sound as far as i could tell... This really has me scratching my head. I'm a bit torn between "if it's working don't fix it" and wanting to make sure there isn't any beverage damage going on. I guess the main output attenuating VR would be worth replacing. I wasn't able to locate it on the block diagram with my tired eyes right now, will have to try again tomorrow.
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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4938 |
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change that trimpot, it is in between the master fader and the output driver and is a dual pot for L & R
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Kevin
North Staffordshire |
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Tedski
Registered User Joined: 15 December 2006 Location: Netherlands Status: Offline Points: 402 |
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Or set fire to it and get a mixer that is not such an utter piece of shite.
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eltron
Registered User Joined: 21 December 2007 Location: Finland Status: Offline Points: 399 |
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Thanks kedwards! Will do.
Tedski, I do see your point... This one's supposed to be hired out though. I'll apologize in advance to all engineers or system owners who'll have to deal with a dj using this stupid thing in the future!
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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4938 |
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nothing really wrong with a DJM500 or 600. Popular kit in clubs.
However they dont like lager tipped all over them or being manhandled by a hamfisted gorilla. Nor do I Edited by kedwardsleisure - 15 April 2011 at 10:59pm |
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Kevin
North Staffordshire |
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chilli
Old Croc Joined: 28 July 2004 Location: United Kingdom Status: Offline Points: 1676 |
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oh come on. if it didnt have pioneer on it no-one would buy them for professional use. ok as a bedroom mixer, but for sound systems?
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Money can't buy you happiness, but it can allow you to be miserable in comfort.
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salsadura
Registered User Joined: 05 April 2010 Location: LEEDS Status: Offline Points: 813 |
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the pioneers dont like phantom power .... so if your using a desk that has global phantom you'll be stuck or if your lucky he dj will be inbetween the band
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cravings
Old Croc Joined: 30 January 2007 Location: Ireland Status: Offline Points: 7441 |
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i wouldn't have thought many dj mixers were into phantom power?
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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4938 |
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Either way I'm sure Ville hasn't got it plugged into phantom power at the moment! What's going to break has broken already.
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Kevin
North Staffordshire |
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br0d3ur
New Member Joined: 20 October 2014 Status: Offline Points: 1 |
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Hello, i got the exact t same problem on my DJM-600, have you found what exactly was causing the problem ??
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