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In spite of its excellent conditions, this #Plus4 does not power up at all 😭

The AC fuse in the PSU and the DC one on the motherboard aren't blown, so my next suspect is the "wedge" power-supply.

These PSUs made by #Commodore in the '80s are known to fail often. Sometimes, they even output higher voltages on the +5V line which powers ALL the chips on the board! 😱

But this isn't the case: the power LED is steady off, and I measured near 0 volts on VCC pins.

#electronics #vintagecomputing