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Had another look at the PS to see why the 5V regulator isn’t getting enough voltage at its input.
there is a resistor R11 = 22MOhm (?) which can’t be found in any of the circuit diagrams listed and I begin to wonder if that resistor is actually out of spec, showing about 6VDC on the entry side and next to nothing at the lead up to the regulator input?
was the circuit diagram altered for the BC7000 model ? Martin might know ?!