On Mon, Jun 25, 2018 at 02:31 am, Craig Sawyers wrote:
That diagnosis gives no information regarding the location of any HV fault.
Yes, but we must know if there is a HV fault. Hope it's not the multiplier. But we do need to know if there is B+.
I figure the best way to proceed, once it is established that the low supplies are up, HV then plates and then grids. Agree ? If there is a short at the ultor supply the cathode end will balk at having too much voltage, neons, whatever else, maybe spark gaps. If there is a short on the cathode side there will be ultor voltage and a bit high, but it won't fry anything out and I am pretty sure it will not cause shutdown. Measuring the ultor voltage can be a real PITA, but it is not always necessary. For the cathode end, usually you can just add a 10 meg resistor in series with the probe which will double the range, just multiply the reading by 2. Many have 2 KV as the top range, so that works for actual measurement. If no resistor it just goes to overload and that tells you there is HV.
If you have a better procedure I would like to hear it. I am here to learn, just like anyone else.
Jeff Urban