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Sound console burns the fuses

Sebastian Chavez Chavez
hace 6 años
hace 6 años
I have a Yamaha MA 407D console, it had a short circuit that burned some resistors and a diode Change the components since the board as such is in good condition, the problem is that when I mount the entire circuit it connects to the current turned on but immediately turned off, check and the fuse burned, change it and return to Burn it, after burning several fuses, disconnect the transformer board that connects it and turned it on well, but its mixing panel and microphone connectors were not working. After checking and reviewing and checking out that the components that I replaced were, connect everything and the cable that feeds the mixing panel and turned on, but I left the one that powered the sound output disconnected, I reconnected it and burned again the fuse, I would like help with it, the cables come directly from the transformer but I don't know how to proceed further
Victor E
Victor E
65.783
hace 6 años
hace 6 años
You should have the power output of the console short. Also check the diodes and capacitors of the source that powers the output. Greetings
leasmacruz
leasmacruz
1.594
hace 6 años

Exactly, check "very carefully remove the amplifier transistors and measure in continuity noq not yet short in the voltage input since this uses a symmetric source as Mr. Victor commented it could also be some driver transistor or some diode in short since as I have been committing and I hope I understand well the fuse blows when connecting the amplifier stage

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Sebastian Chavez Chavez
hace 6 años

Could you tell me how to measure diodes and capacitors to know if they are in correct and erroneous operation, I would like to add photos but I do not know how ????

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Sebastian Chavez Chavez
hace 6 años

Yes, the fuse burns when the audio output power is connected, there are two cables, one is the one that feeds the mixing panel, where the microphones are connected, when connecting only that cable the console turns on and does not burn the fuse even It recognizes the microphone since it shows activity of the LEDs, but the cable that feeds the audio output when connected is the one that burns the fuse, makes a strange noise the transformer and turns off because the fuse has already blown. today check and there was a 5w r39j resistor in short and a transistor c3856, replace them but keep burning the fuse

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Victor E
Victor E
65.783
hace 6 años

The cables of the traffic go to the correctors and filters or electrolytic capacitors and from there they go to the transistors of the audio output. They also work with a split, negative and positive source with respect to mass or chassis.

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leasmacruz
leasmacruz
1.594
hace 6 años

With respect to the goddesses in the multiteste, whether in diode scale or resistance, you should measure yourself under one-way ohm, xom the capacitors or capacitors if they use the electrolytic, that is, what appear to be cylinders is measured with a capacitor of not having it, it can be measured with A multitester analogue on a 10x scale will notice that the needle marks and goes back to zero, but if it looks dry, so it changes, do I check the output transistors? It is very frequent these are damaged

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Victor E
Victor E
65.783
hace 6 años

I'm glad greetings

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