3 Before Repair and Adjustment
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Disconnect AC power, discharge Power Supply Capacitors C12, C42 through a 10 Ω, 10 W resistor to ground.
DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as this may destroy solid state devices.
After repairs are completed, restore power gradually using a variac, to avoid overcurrent.
Current consumption at AC 230V-240V, 50Hz in NO SIGNAL mode should be ~850 mA .