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Well.. I changed all the 47uF caps. They're all through-hole, and they're all soldered properly to the solder pads _and_ the hole where possible.
The +5V line varies from 4.87V (the highest I had) down to 4.7V, when running with just the CPU card. Adding the original 4000 Zorro backplane lowered the voltage to 4.64V, enough to boot the Amiga sometimes, but not enough when other hardware is in.
Can anyone help? It's working perfectly except for this wretched voltage problem!
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