I had the same problem... Here is what I did. As the previous post mentioned, remove the black plastic turntable platter. You now should see the loose belt. If the belt is still good, place it back on the underside of the platter. You will notice there are two opposing plastic pins located at the outer edge of the platter. Pull the belt over one of the pins. Place the platter over it's chrome spindle shaft, with the plastic pin facing the motor shaft. after the platter is in place (don't put the "e-clip" on just yet...) rotate the platter a couple of turns. This should do the trick. If not, keep trying. It worked for me on the first try. After the belt is back on, secure the platter with the e-clip and replace the black rubber mat. Viola!
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If you measured the worn belt, it might have stretched by 5-8% from the original length. Thus the new belt could be too large. I can't find a reference to the original Technics SG2500L belt. However one site, http://www.turntablebelts.com/panatech.htm , suggests that the appropriate belt may be the FBM 23.6" (60 cm). This is the generic belt for a range of Technics turntables. If they list a turntable model, then they know a different belt is needed.
The best way to measure the belt length is to wrap a string or wire around the belt path on the turntable. Follow that path exactly. Mark the point where you overlap the string or wire. (In case you keep your fingers on the end of the string, mark both the start and end points by drawing your line across both sections of the overlapping string.) Remove the string or wire and lay it flat. Measure the length from one mark to the other. That's your true belt length.
At it's simplest description- you remove everything that sits in front of the timing belt path, which is usually the serpentine belt, and main pulley on the crank shaft, removing the covers over the belt, then lining up the number one cylinder timing mark on the crank shaft and camshaft locations, the old belt is removed by removing tension from the tensioner, engines vary as to how that is accomplished, but it is largely a variation on a theme. the old belt slipped off, the new belt slipped on, the timing marks checked, and then reassembly inthe reverse of how it came it apart.
Details will differ between the different engines but at it;s simplest, this is the basic process.
this sounds like the belt that drives the turntable itself is slipping you can normally access it by removing the securing clip by the centre spindle and then lift the turntable up and you should be able to see the belt give the belt a good clean with isopropyl alcohol refit and hey presto (if you still get slippage order a replacement belt )
There is usually a cotter pin at the center of the platter around the spindle base. This can be removed with a screw driver using a twisting motion. There is a blades worth of space between the clip and the spindle base. Screw driver should be in vertical position. Sometimes the vinyl slip mat must be removed first. Watch that clip, cause it can go flyin. Once the clip is removed, the turntable should let go easily.
Unfortunately it sounds like the belt either broke or is slipping. If you're up to it, you can order a replacement belt from a few different places online. As I haven't messed with a turntable in years, I can't make any personal recommendations. A quick google search returned this company, though... http://www.turntableneedles.com/
You'll need the current belt measurements before you order a replacement. And, disassembling the unit will confirm if the belt is broken or just slipping. (Or, better yet, slipped off the pulleys!)
Keep in mind that replacing the belt can be a daunting task.