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Thread: Technics turntable problems

  1. #1
    Senior Member Slobrain's Avatar
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    Technics turntable problems

    Hey all,

    I didn't really want to bring this here but I cant seem to find replacement motor for a Technics SL-B3 belt drive turntable. The motor is a DC frequency generator servo and its flaking out. It jitters instead of holding speed. I checked the power supply and cleaned all pots and switches but is still jitters. I feel the motor isn't holding the speed anymore.
    So I'm trying to find a replacement motor for this table to get it going again. Its not the best TT but its not bad for what it is.

    Cheers

  2. #2
    Supporting Member The Dude's Avatar
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    Many of the Technics tables use the same motor. Can you upload a picture of it and, if possible, any numbers that are on the actual motor?
    “Yeah, well, you know, that’s just, like, your opinion, man.”

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    Senior Member Slobrain's Avatar
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    technics-motor-1.jpg technics-motor-2.jpg technics-motor-3.jpg
    Here are three pics that I found on the internet that are exactly like mine. I see a used motor on Ebay but not really wanting to get a used one since they can be wonky too. I'm sure there's got to be new ones out there somewhere... this is just a 12 volt servo motor. Ive looked all over the internet and it amazes me no one carries any new or NOS parts for these TTs
    Luckily I still have my Technics SL-D2 that works but its a 1980 model too.

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    Supporting Member The Dude's Avatar
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    Oh, yep, those were discontinued long ago. Probably your only option is going to be finding a "low mileage" used one. Like you said, that's a bit of a crap shoot. Does yours spin freely? Have you tried just lubing the motor shaft? Sometimes they just get sticky and a good clean/lube will make them work again.
    “Yeah, well, you know, that’s just, like, your opinion, man.”

  5. #5
    "Thermionic Apocalypse" -JT nickb's Avatar
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    Let me preface by saying I know nothing about these. My thought was that if it is servo controlled, could there be an actual circuit problem that has caused the servo loop to become unstable? Rather unhelpfully, the only way I can think of test for this is to substitute a known good motor. At least it means you only have to borrow one to test it out.
    Experience is something you get, just after you really needed it.

  6. #6
    Supporting Member The Dude's Avatar
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    FWIW: I'll preface by saying that it could be the servo circuit, of course. That said, I worked on lots of these when turntables were more popular. It was almost always the motor itself. Much of the time, a few drops of oil would make it work again.
    nickb likes this.
    “Yeah, well, you know, that’s just, like, your opinion, man.”

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    Supporting Member The Dude's Avatar
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    Haven't used it for a while, but I have this RS "Needle Tip Precision Lubricator" for that kind of thing. Usually working some of it into the motor shaft gets things going again. It also works well for spindle motors in CD players.

    oil.jpg
    “Yeah, well, you know, that’s just, like, your opinion, man.”

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    Senior Member Slobrain's Avatar
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    Hey Guys,

    I actually found this on ebay
    https://www.ebay.com/itm/25MM-Mounti...53.m2749.l2649
    found this too
    Audio-Technica 704 F706 7303 Motor For ATLP2D USB And ATPL50 | Full Compass

    The top one I ordered and its on its way, I'll find out if it works. If not, I'll order the second one from Full Compass and see if it works. I did oil the motor but the speed still fluctuated and I did take the motor apart to see if it was something I could repair but on the small circuit. there was a 8 pin chip that I can't tell what it was and not having a schematic to the motor circuit sort of kept me from trying to fix the problem at the motor. I know there are still servo TT motors out there but getting one that works is the problem, there just isn't anyone telling what they use as a substitute to fix these old TTs. I prefer the old Technics tables to any new stuff. Hopefully something will work out of the two different motors. Its a shame that in this current age we just dont have the quality turntables like in the heyday of the 70s. You dont know what you got till its gone...lol.

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    Senior Member Enzo's Avatar
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    The motors are probably common, but the trick is to find one with the proper pulley diameter on it.
    Education is what you're left with after you have forgotten what you have learned.

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    I hope one of those 5 holes is redundant, you only have 4 wires.
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  11. #11
    Supporting Member The Dude's Avatar
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    Quote Originally Posted by Enzo View Post
    The motors are probably common, but the trick is to find one with the proper pulley diameter on it.
    ......and RPM's and rotational direction.
    “Yeah, well, you know, that’s just, like, your opinion, man.”

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    Old Timer olddawg's Avatar
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    Have you popped the back plate off. It's easy to do with a pair of dikes. The back bearing can get mucked up. As can the brushes which Deoxit can help. Also many have an internal regulator that has small caps that dry out and a transistor. I've repaired a few. If you do this, don't try to crimp the back cover back on again. You can deform the case. Use a couple of dabs of 5 minute epoxy.

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    Senior Member Slobrain's Avatar
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    Hey Enzo,
    Have you exchanged the pulleys on these to make one work?

  14. #14
    Senior Member Slobrain's Avatar
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    yes, did that and put it back together, with some finger pressure I got the plate to pop back into place. Surprisingly after taking it apart and lubing the motor the TT is holding speed. I did change out a electrolytic on the PS side so maybe that helped. Tested the old cap on a beckman cap meter and the mf wasn't too far off but who knows, that doesn't test it under load.

    I'm glad that turntable is back up and working, those old Technics were really good for what they are. The newer TTs are not so good, but there are some that are not bad either. I'm just glad that albums came back into popularity. CDs are cool but I love putting on an old album and just sitting back and listening like I did back in the 70s. No internet, no TV, just some really good music to enjoy...
    minim likes this.

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