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Also makes wonder if D608 are not resistive or open, or some trouble with this line (the circuit/switch for the AUTO/Manual are inoperative?). Certainly one function corresponds (the one making GND connection) to basically near 0V on the cathode of D608. Then the cathode of D609 will presents very low voltage I suppose. Unless...
The cathode of D609 is connected to another thing in the circuit, or is only to Q613?
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So many projects, so little time...
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