many thanks! Apparently it was the power supply, I was trying a cheap replacement supply because I couldn't find the original one. The voltage was fine when not connected. It's hard to measure the voltage under load. But eventually I was able to determine that the voltage dropped down to...
4 1/2 years later I have a similar problem, my AW1600 won't turn on. I think the power is just not getting inside. I am suspecting contact issues. I haven't used it in 10 years. Did you ever get yours fixed?