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The test point may contain information that can be interpeted 2 different ways. With a scope, you will see the entire wave, peak to peak. Your volt meter depending on design will read whatever it is designed to read, some will read and store peak, some will read average, and most will read some type of R.M.S. this is a area under the curve calculus derived average voltage. The schematic often details how all readings are taken, and in some cases even details the type and model instrument used, (or equiv.) is often written. Your RMS voltage will depend on the quality of your meter, and the old expensive ones did say what frequency you can use it and expect a certain level of accuracy. I don't know what new ones say in the instructions...
It is important to be sure your test equipment is reading correctly, or you will be chasing something that does not exist. A calibrated ebay piece of equipment means squat unless you do a little checking to be sure it really is what it is....
If tp5 is not reading correctly, your problem may be right there, everything very near that point needs to be checked.
Funny thing about man made stuff.... Sometimes one model of something all have the same problem. So don't overlook something just because you got a replacement somewhere.... Go by what good troubleshooting skills are taking you towards.
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Yes you can call me "Squirrel boy"
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