I know this is kinda a long shot here, but Bill W1PA, were you able to solve the problem with your radio?? I have one here with the exact same problem as yours.
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Plugging in the power results in a black display that's trying to show "CHG TIME RMN" with a count down timer.? Orange status LED lit.? Pressing power increases current draw from the supply and the radio won't start.? Un-plugging power and re-applying it restarts the cycle.
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So far I've found fuse F1002 open, but looking at the schematic, that shouldn't cause it to not turn on as it only supplies power to the filer/ PA assembly.? A replacement fuse is on the way.
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I've also observed the emitter of Q1082 while pressing the power switch.? The voltage jumps to 13US, then immediately drops to around 2v.? Jumping 13US over to the emitter and forcing it on doesn't do much except make a relay click on the filter board; display still black, CHG TIME RMN with a counter still sorta visible with a flashlight.
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I'll check the 5, 6, and 9V rails when I replace the fuse later this week.
