To repair/restore radios, I need a good schematic for your particular model radio.  A schematic looks like this - 

A lot of the more common radios have their schematics published on public web sites. Some of those sites are -

http://www.nostalgiaair.org/Resources/

http://techpreservation.dyndns.org/schematics/manufacturer.htm

If your radio is not listed on these sites or other public data bases, then I will need to acquire the documentation from a seller of schematics for a charge usually between $15-$25, before I can work on your radio.