![]() ![]() I called Miller to ask just what the purpose of R4 is, but the gentleman didn’t know. I tested continuity of R4 which shows 12 ohms. This is a mystery because the original wiring has the connection on the ‘wiper’ and one end of the resistor. R4 appears to be to limit rotating field current and discovered if I short R4, the auxiliary power returns. Have not tested the reactor and stabilizer because I believe they are downstream of the problem. Test continuity of all relevant wires and connections. Checked engine rpm in ‘weld’ mode- okay at ~3600. Checked resistance across R1- okay ~30 ohms. Cleaned slip rings and brushes, checked alignment and tension. Resistance across rotating field is about 41 ohms. Suspected C3 as well, so replaced it with a 20 micro farad. Found bridge rectifier (SR1)and diode (D8) both not working. Here is what I found: ( Refer to circuit diagram # B-070 633). I know that the carbon arc process can be stressful to a machine but it handled in the past. Recently, I noticed after some carbon arcing that there was no weld or aux. Always kept inside in my shop, clean and warm. I bought this welder new and it worked perfectly for 38 years. I have read all the other posts regarding this topic but I am seeking more information. First time posting on here so maybe I can get some advice regarding loss of weld/power functions on a Bluestar. ![]()
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