Short in tone arm - Technics SL-1210 Turntable

General Crosley repair video, maybe starting point

https://m.youtube.com/watch?v=0fhuBeLVmFg

Is the positioning off on the tone arm?

There are a couple things that could do this...one would be if the reject bottom was stuck in or the wiring going to it shorted out, take an ohm meter and make sure there isn't a low resistance across it..The other thing I can think of is the reject switch on the tone arm is closed or out of adjustment and thinks the tone arm is at the end of the record so it rejects as soon as the needle sits down on the record

Sounds like it has a short wiring

Try lifting up the turntable mat. You should see a hole. Note how it fits before removing the belt.

If you study the screws around the cradle that the tone arm sits in you will see that it is adjustable. This determines where the tone arm is when the record comes up. If the machine was always wrong like this it may have been set for 45rpm records. You need to adjust the whole tone arm post with the screw that goes up into the base of the post..

Hi, Try this. with it turned off. Lift tone arm across a record to the run out groove and set it down. Now power up and hopefully it will reset itself. In all honesty I would sell it and get a decent old school player. John. Styluscity.com

What is the weight on the stylus? Flip the protective shield down to protect the stylus if available. Tare the tone arm (adjust the counterweight on the back of the arm until the arm floats perfectly level), then hold the counterweight and turn the dial markings to read zero. If you cannot find the recommended mass for the stylus you can use the average weight of 3g. Verify your tone arm is still floating in the center and the arm is perfectly level. Turn the counterweight until the dial indicates the specified weight of the cartridge manufacture specification sheet or you can set it for 3g if you do not have the specification sheet.

Isn't there a little knob with a +/- setting that allows you to move the indexing in or out from the edge of the groove? Play with that and see if you can't get it dialed in a little better...

I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.
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On some record players there is an adjusting screw at the back of the tone arm that adjusts the tone arm drop in location but I don't think it will adjust the pick up point. That is controled by a steel rod under the record player deck that moves over and pushes a little trip lever near the center of the platter so that a gear is engauged and the end of record cycle is started. I'm not sure but you may be able to find an adjustment under the deck that is near the rotation point of the tone arm that will adjust that rod so that it will pickup later. Hope this helps some.