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Check the voltages on the LOW VOLTAGE power supply first. I suspect you may have a cap or diode problem there. On the schematic, it should start out at 395? then drop to 270 or so. Use the actual values on your schematic. Check voltages all the way down the voltage divider chain, comparing to the schematic. Also check for ripple (meter on AC scale).
My gut feeling is one of the voltage doubler caps is open. Let us know what you find.
John
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