Technics sl-b303 The technics sl-b303 (aquired in 1983 new) turntable slows down and speeds up. The table has black ground wire which is used. If not used the problems still occurs. I have second turntable which connectly play with same ac plug in. The motor is speeding up/down. I replaced the belt and condition the surfaces. the ciruit boards are clean not visual hot spots or broken wires,. I used the speed adjust on the top side as per manual. Thank you

Charles,

It took me about an hour to find this info for you. Problem is that you'd be taking someone's word for it. The answer came from a turntable forum where another person asked what other dust covers fit the pictured turntable (model SL-B303) Several people responded and if you click on this link:
http://audiokarma.org/forums/index.php?threads/technics-sl-b303-dustcover-hinges.348163/ , look at the bottom right hand corner of every response on that page.(they are numbered) and you'll see that #1 has the question about the cover for the SL-B303. Scroll down to response #6.
This person says that the SL-B101 and the SL-D303 use the same cover.
Where did he get his info from? It's a risk but if you find another person that says the same thing, chances are it's the right answer. Wish TECHNICS had some sort of official release so that everyone could see what covers fit which turntables.

Good luck

Usually, on Technics turntables, the ground wire is attached to a ground lug on the receiver.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/david_29ad5d1dd86564b0

Web search "hum on turntable with ground" for various techniques to analyze it.

Good day. It sounds to me like the belt is worn. Under the felt of the turning section, there should be two rather large holes. Insert your thumb and forefinger and pull the table off. You should also see where the existing belt is running. Insert new belt around the motor first and replace the table section. Now, through the two holes, manouver the belt onto the table section until it spins freely

Depends on if it's a belt drive turntable or direct drive.
If a belt one, there will either be a speed adjuster on the top of the motor, or one on a PC Board. And yes apart from setting the speed, it as straightforward as taking the old one out and wiring the new one in.
The direct drive, will also have to be adjusted for speed too.

just get any small speaker wire and use that as your ground , attach that to the reciever you are using

the motor needs cleaning,along with the inner shaft on the spindle and a new table belt will help they glaze and slip

It is not suggested that you remove the ground cable. Performing the mod for the ground by soldering a bridge on the circuit board doesn't really do anything either than remove that buzz/ground hum. You've essentially removed the wire that grounds the turntable cabinet to the earth. The buzz is gone, but now your turntable is no longer grounded properly.

I would suggest replacing the ground cable to it's original state, then attach the Monster cables.

If this does not work, then either there is an issue with the soldering to the board, or the board itself might be damaged. You might want to look at the trace paths to make sure none are lifted, or damaged in any way on the board. Another issue might be faulty tonearm wires or not properly soldered wires.

FYI, monster cables are not good for this purpose. I would suggest the following cables:

MOGAMI RCA CABLES

- OPTiC
The ORIGINAL 1200 TECHNICIAN.

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yah ofcourse  you replace a new one at www.turntablelab.com