Disconnect everything but the main power supply.? All the cards and mainframe ought to be disconnected.? That means if there's a short, it's on the power supply board.
Think of it as the ultimate of "removing the parts" <grin>
I'd suggest checking CR1757 (not too likely) and C1757 (possible).? Nothing else dumps the 15 volts to ground, assuming that the rest of the parts are ok.
Harvey
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On 3/23/2022 7:21 PM, James55 wrote:
Today has been a loooong day for me, but tomorrow I intend to go through the entire +15v rail to test, measure and record each component, across itself and relevant to ground.
There is clearly a not insignificant problem on that rail, so some diligent detective work is on the cards (maybe I should change my user name to 'Colombo'? :)
In the meantime, if anyone has any more suggestions, I am all ears.....
James
