The jack sockets on my 20 year old GSP-2101 were beginning to be problematic. I decided to upgrade them with some REAN NYS216G sockets that I ordered from Mouser.com. These upgrades have gold-plated contacts, are dimensionally exact replacements, and have solved the problem beautifully.
To replace the jack sockets, you have to remove the motherboard from its chassis. I created a Microsoft Word document file that explains step-by-step how to do this and I uploaded this file to the FILES section of this discussion forum. However, this POS Yahoo web site is not allowing me to download the file.
If you are having the same problem and are interested in how to upgrade your jack sockets, or if you just need to know how to remove the motherboard from your GSP-2101, send me an email and I'll send you the file as an attachment.
Graham Pearson