Home Theater Questions? Ask a Technician for Answers ASAP
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On this page
a new member (in 2006) named
31-2106 STA-5500 AM/FM Stereo receiver
as a service manual or similar for your receiver model.
However, getting in touch with him may be difficult. Try through his highlighted link-tag for his name
IF you cannot get anything that way, there is at least this:
And though your exact model isn't listed, there's this site to inquire through:
They may be able to find it for you if you contact them. It's a very reliable site.