![]() I have tested all the circuit components and are all OK all have the proper values. Immediately, the power transistors and resistors get in the same condition: transistors all have 0 ohms between B-C-E and resistors are opened, and the circuit get smoke. Then I mistakenly replace the fuse with one whose value was 5 A and turn on again. When I turn on the equipment, the fuse immediately burns out. The original damaged transistors were 2SA1076 and 2SC2565 which I replace with 2SA1943 and 2SC5200, respectively. I replaced all these components and put a proper fuse for my AC voltage (220 VAC) whose value was 2 A, and also connected headphones as a load to the amp. I've attached in this thread a picture of the affected amplifier circuit.Īlso both R644 0.22 ohm 5W combined fuse resistors between emitters are open, and the same occurs with the R640 resistor. When I tested the amp, the right channel has the two power transistors shortcircuited (both have B-C-E measured 0 ohms). I´ve get an old JVC A-X2 Super-A integrated amplifier from a friend to be repaired. ![]()
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