munamunamike Posted March 8, 2010 Share Posted March 8, 2010 Have yu ever seen this before, and if so what was the fault? Any help greatly appreciated! Mike Link to comment Share on other sites More sharing options...
ChazHS Posted March 8, 2010 Share Posted March 8, 2010 Looks to me like a motor problem, does this happen all the time? No matter what the pitch range is? Link to comment Share on other sites More sharing options...
munamunamike Posted March 8, 2010 Author Share Posted March 8, 2010 yeah happens whatever the pitch range is set to.. Have you ever seen this before? Link to comment Share on other sites More sharing options...
paulears Posted March 8, 2010 Share Posted March 8, 2010 They don't really have motors in the usual sense, the 1200 series was one of the first to use direct drive motors, and surprisingly powerful ones, able to get the heavy platter up to spped in about a quarter of a revolution, just what DJs wanted then for old fashioned cueing - scratchy scratchy stuff not even thought about then! One of the key features was a PLL speed accuracy system that constantly monitored the speed and made adjustments. The fact the deck speeds up, stops and reverses is a good indication the drive windings are fine, so the likely fault will be with the feedback sensor circuit - it thinks it's too fast, so it stops, then realises it's too slow so starts again. Just a guess, but if the deck gets bumped about a fair bit - it could simply be a dry joint. The recored deck equivalent of when a moving head light loses the feedback from it's sensors and starts to wave about out of control. I know this doesn't help you fix it - but it would certainly be fairly simple to open it up and have a look - and maybe if you want to fix it yourself, try doing some swaps with the other one that works well - at least then you have a pretty good chance of isolating the fault to a particular area. Link to comment Share on other sites More sharing options...
munamunamike Posted March 8, 2010 Author Share Posted March 8, 2010 They don't really have motors in the usual sense, the 1200 series was one of the first to use direct drive motors, and surprisingly powerful ones, able to get the heavy platter up to spped in about a quarter of a revolution, just what DJs wanted then for old fashioned cueing - scratchy scratchy stuff not even thought about then! One of the key features was a PLL speed accuracy system that constantly monitored the speed and made adjustments. The fact the deck speeds up, stops and reverses is a good indication the drive windings are fine, so the likely fault will be with the feedback sensor circuit - it thinks it's too fast, so it stops, then realises it's too slow so starts again. Just a guess, but if the deck gets bumped about a fair bit - it could simply be a dry joint. The recored deck equivalent of when a moving head light loses the feedback from it's sensors and starts to wave about out of control. I know this doesn't help you fix it - but it would certainly be fairly simple to open it up and have a look - and maybe if you want to fix it yourself, try doing some swaps with the other one that works well - at least then you have a pretty good chance of isolating the fault to a particular area. Interesting, the odd thng was I was using them at a party, changed the record and when I started it back up it started doing that! They have allways been flighcased and never knocked around, I have popped it opend and cannot see any obvious signs of damage/loose wires etc but will have another olook tommorow! Cheers paul.. Link to comment Share on other sites More sharing options...
tolley1466 Posted March 8, 2010 Share Posted March 8, 2010 Where are you from? Someone might be able to put you in the direction of a local hire company etc, who might be able to fix it. Link to comment Share on other sites More sharing options...
munamunamike Posted March 8, 2010 Author Share Posted March 8, 2010 Im in dorset and have someone who services technics. but I wanted to know if it was something people had seen before incase it was an wasy fix.he said he had never seen it before and if some has seen it before and rectified the problem I could just pass the details onto him! Thanks tho Mike Link to comment Share on other sites More sharing options...
KevinE Posted March 9, 2010 Share Posted March 9, 2010 No SL1210 is an easy fix, the board is quite fiddly to get out as it sort of half-surrounds the motor stator. Most crazy SL1210 faults are caused by dry joints, there are a couple of tiny electrolytics on the motor pcb that can go s/c and I think they cause the platter tacho to become dc coupled to the motor drive IC with silly results. I hope you've checked it's not full of beer. Link to comment Share on other sites More sharing options...
Samwise Posted March 11, 2010 Share Posted March 11, 2010 Probably is a bad joint leading to weird things happening to your motor. Are you sure the power supply is a good clean 230V? Regards, Sam. Link to comment Share on other sites More sharing options...
munamunamike Posted March 11, 2010 Author Share Posted March 11, 2010 Probably is a bad joint leading to weird things happening to your motor. Are you sure the power supply is a good clean 230V? Regards, Sam. I have tried it in 3 locations now so I yeah..Also have looked inside for signs of spilleages and here is a little dust inside bit that is it.. Link to comment Share on other sites More sharing options...
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