Hi Rick,
The most important thing that you can do with your FRG-7 is to make sure the fuse in the rear holder is 1/2 amp and no larger. If a problem develops with a main filter capacitor the fuse will blow. It doesn't hurt to inspect the electrolytic capacitors for leakage and replace if leakage is found. Take a look at the solder side of the circuit board holding the large capacitors. Does it look like the solder has been disturbed under the capacitors? Problems with electrolytic capacitors are proportional to the voltage they are subjected to. A 450 volt filter capacitor will not last as long as a 25 volt filter capacitor. All of the electrolytics in your FRG-7 are low voltage. I never replace all of the electrolytics in low voltage transistorized equipment. It's easy to damage the circuit board traces and pads.
If I was going to check all of the electrolytic capacitors in circuit I would use an ESR meter. See - for some more information.
73
Roger VE7LB Group Owner
