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Help Technics SL-B205 motor not spinning no voltage to motor

J

Jerry76

New Member
I bought online a technics SL-B205. Everything seem to work but the motor. The strobe light lights up when you move the arm over, post light works, the cueing up and down work, if you hand spin the record the stop button works and returns the arm, so does the auto stop. Along when it’s hooked up to the stereo it play great when you spin it by hand. But the motor does not spin flipped it over and checked for voltage at motor post and there’s no voltage, but I don’t know where to start from there. Any pointers to where to start? Option 2 is just buy a cheap motor for a turntable and 3-D print out a mount for it and just make it work for 33 rpm for now.

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It looks as if you'd have a switch that is actuated by moving the arm across towards the platter. You should probably confirm that it has continuity. Chances are your problem is elsewhere, but best to rule out the switch. If it's failed, no juice to the motor.
 
Yes there a switch when you move the arm over that make continuity the speed light turn on, but still no voltage to the motor. I’m just not sure where it changes from ac power to dc to run the motor. Did some looking around and I think I need to test the rectifier and see if it outputting dc voltage.
 
Tonoje said:
It looks as if you'd have a switch that is actuated by moving the arm across towards the platter. You should probably confirm that it has continuity. Chances are your problem is elsewhere, but best to rule out the switch. If it's failed, no juice to the motor.
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May also be Hall sensor IC based. If it depends on them to keep speed, and they have no continuity or are dirty, you have the same outcome, motor doesn't spin.

But he really needs to reflow those two big motor terminals first (diagonally under the yellow MOTOR), almost certain those are not ok, and they need to be for the motor to work.
 
Oops, missed the part where you mentioned moving the arm already. Sorry about that.

@kamisama, I was wondering about those solder points too, they looked a little rough to me but I couldn't really see in detail. The trace seems to have seen some action though.
 
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kamisama said:
May also be Hall sensor IC based. If it depends on them to keep speed, and they have no continuity or are dirty, you have the same outcome, motor doesn't spin.

But he really needs to reflow those two big motor terminals first (diagonally under the yellow MOTOR), almost certain those are not ok, and they need to be for the motor to work.
Click to expand...
Ok,I need pull the motor and clean it out and lube it. I make sure to flowed them better.
 
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