Hi,
I'm not sure myself, but I believe you can view a copy of the service manual on the web.
This forum won't let me copy in a web address, but if you google "technics sl-15 service manual" you'll come up with some sites. One that I viewed was at "diyaudio.com".
If you'd like the link where I found the manual, just shoot me an email or PM. (I can't seem to PM yet either, as I only have 2 posts on the forum)
Thanks,
Scott