IIRC, that is controlled by a belt. You should be able to replace the belt and be good to go.
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Found this at the vinylengine site:
Posted Sat, 06/19/2010 - 20:00 by Schmuck585
I too have the sl-1900 and was used only a few times in the last 15 years. I had a problem with the cueing lever raising and lowering and researched on the internet and found that I had to disassemble the turntable to clean the cueing cylinder and replace the grease (special silicone grease)that over time had leaked out. It is very involved and takes a few hours the first time you do it. There is also an adjustment screw near the lever on the outside that makes an adjustment for where the needle places on the record when it starts.