ScuzzBlog: Diaries November 2021 Entry 7th November 2021: Post 1: Amiga PSU - A600 High Pot Tested. Amiga PSU - A600 High Pot Tested. I generally act at the first sign of problems with any of the kit. I am not an electrical engineer and have no electrical skills and so generally work from a gut feeling. Today I swapped out a PSU cus I just sensed something was wrong. The PSU in question was a very heavy smaller type A600 PSU that I was using for an A1200 with a Typhoon accelerator. Yesterday I walked past the computer and could swear I could hear an electrical static noise coming from the power connector to the 1200. I was unable to replicate the problem but it was enough. What was odd was that the PSU was switched off. Like I say this unit is very heavy and I sense is filled with resin. There is no obvious way to open the PSU with no screw holes. The PSU carries the label High Pot Tested which means that insulation used is adequate enough to withstand the high voltages. Known also as a voltage withstand test it stresses the insulation far more than normally encountered. Which makes me believe it is resin filled to avoid maybe intumescent coating of the case. And fully sealed. I have no idea, and so I decided to pull from the store a working PSU and swap over. I only ever use A500 PSU units and it's rare to have any other type out with computers. The one I decided to use is evidence of the intumescent used by Commodore. It has gone very yellow from being exposed to surface heat and therefore I decided to exchange cases. A few months ago I had a burn out of two resistors caused by a faulty socket switch. The case though marked with what appears to be cigarette burns was generally ivory in colour and perfectly acceptable. The PSU works no problem which I base on absolutely no electrical testing what so ever. I just make a judgement based on my own experience. There was no sign of capacitor bleeding or swelling of the cans. She looked very clean and no browning to any resistors. I gave the replacement case a scrub and photographed the damage caused by the burning for record purposes. I also noted the place of origin being West Germany which dates the product very well. Anyhoo the A600 worked just fine as a test. I certainly wouldn't have risked an Amiga if I was in any doubt. Next I connected up the A1200 to the PSU and she is working just fine. Times like these I do wish I was technically minded and had the skills. With none at hand all I have is my instincts. My biggest rule regarding PSU units since around December 1994 has been to never trust an Amiga 1200 style power supply. Seems to have worked for me over the years. No more crackling static noises, and therefore can put the fire extinguisher away for now. Happy days... Getting colder. Whoo Hoo !! Amiga PSU - A600 High Pot Tested.

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Last updated 7th November 2021

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