10-09-2014, 08:32 PM
1. If this is what you meant - I put one probe of the continuity meter on one side of the wall plug prong and the other probe on the other one. There is no continuity whether the set is on or off. It's the same thing with another radio that works fine, but maybe you meant to do something else?
2. With the switch turned off, there is no continuity if I put probes on the rear two terminals on the POT . If I turn on the POT, there is continuity.
3. There are two sets of terminals, each with 3 posts. On the set most towards the rear of the POT, if the switch is OFF and I measure resistance between the middle post and the uppermost pot, it reads 28 ohms. If I turn on the switch, resistance then ranges from 1.37 Megaohms to 1.65 megaohms depending on whether the volume is turn up or lowered. Resistance from the middle post to the lowest post reads 1.65 megaohms with the switch off and/or at lowest volume setting and reads 17 ohms at full volume.
4. Set of terminals towards front of POT (controls tone)- middle to upper post resistance ranges from 1.15 megaohms to 148 ohms if the switch is off or tone all the down. Middle post to lower post resistance is 16.33 megahoms when switch is off and goes to 87 ohms with highest setting.
I'm not sure what to make of all this. The schematic for this double POT indicates one section is 5 megaohms and one section 3 megaohms. Interestingly, I noticed when I was replacing some caps that bottom terminal of the front most set of terminals was bent and contacting the metal casing of the radio. When I check the resistance of the terminal I get the 16.33 megahoms reading - I wonder if that means it is fried. Still, the on/off control does create continuity on the rear terminals, so you would still think the set would get some power coming through even if the tone control part of the POT was fried?
I will check all the other stuff over the weekend. Thanks for your patience.
