I have a Soundesign AM/FM/Cassette/turntable, probably 15-20 years
old...Modes 6871xx with Disc player model 5050...to resolve an issue
with "no volumn" I need a schematic or wiring diagram...I checked with
Sam's Photo Fax and they do not have a listing for either model.  I
can't find a website specifically for Soundesign to ask my question. 
The model numbers above are on the components and on the Operating
instructions.  I guess I need a cross reference.

I don't have a cross-reference to offer you, but for what it's worth
the majority of those old combination units were manufactured by BSA.

-Chromedome

Hi!

Have you looked to see if your device has a Chassis #?  Also good is
to look-up the FCC ID# and the UL Code. Just an idea!!

kitemaker