2 Before Repair and Adjustment
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Disconnect AC power, discharge Power Supply Capacitors C527-C530, C561, (C702, C716 for GC, GT, GCS & GK only) through a 10 Ω, 5W 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.
[For GC, GCS, GT & GCP only]
Current consumption at AC 110/240 V, 50/60 Hz in NO SIGNAL mode should be ~650 mA respectively.
[For GK only]
Current consumption at AC 220 V, 50 Hz in NO SIGNAL mode should be ~650 mA.
[For GN only]
Current consumption at AC 230 V, 50 Hz in NO SIGNAL mode should be ~850 mA.