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Old 24 April 2019, 15:04   #6
Daedalus
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Join Date: Jun 2009
Location: Dublin, then Glasgow
Posts: 4,075
To be able to tell if the PSU is struggling, you really need to check it while the machine is turned on and displaying the fault. A good place is the floppy power connector. The middle two pins are ground and the left-hand pin is 5V (the critical rail for the machine). Checking the PSU's plug without the machine attached can give you misleading results.
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