I have a CTC203AX set with the common sound going away problem until, the set is powered off and back on. Here is the internet person fix for it;
I found this tip from Dennis Viereck website that helped me correct a few CTC203 no sound problems. There is a smd cap off of pin #1 of U12101(LA7612N) whose glue at times goes conductive. Cap # is C309 if I remember correctly, cap is good, just lift it and clean the glue off the board. Also check L12303
I have tried this but there was an issue with the labelling of cap C309, off pin 1 of IC LA7612A is actually C304 I believe, also the capacitor didn't resist my iron which was too big. I would like to replace with an axial type but I do not know the value. Would you someone else have the value for that cap?
Appreciate your help if you can.