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Professional Audio

pioneer home amplifier deactivates the relay when the volume goes up

pedroza2016
hace 5 años
hace 5 años
Benas afternoon fellow vemgo in this opportunity to request your knowledge and help, I got a homemade pioneer brand amplifier which turns on and you listen well but the problem lies in increasing the volume the relay is deactivated and then activated if the low volume remains active, I have already checked the outputs and they all mark me well with my multimeter this transistor carries 2sc5200, and reviewed the diode that goes in the relay coil and this marks me well, check the transducers that activate me to the relay and all good I don't know what else to check, If it fails, it is in the pre-amplifier or in the power stage. I spent all day reviewing and I have not found the fault. I hope you can help me from now thank you very much
romaci2005
romaci2005
4.485
hace 5 años
hace 5 años
no audio signal connected place a DC scale voltmeter on the preamp input, move the volume control, The voltage must be 0Vdc. if DC voltage is seen, check preamp. Best regards
pedroza2016
hace 5 años

ok friend thank you I will do the test and comment re
sultados

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pedroza2016
hace 5 años

friend, I tell you something I don't have a voltage output through the preamplifier or the power stage,
but something happened to me that I still don't have
I started the amplifier and touched a somewhat hot driver, I went and replaced it with another one, thinking that it could be on the run,
I turned on the ampli and it sounded good and I didn't deactivate the relay, but after a few minutes puffff burned 4 power transistors at the same time, but still not why?

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romaci2005
romaci2005
4.485
hace 5 años

If you replaced the original transistor with another, it is very likely that the driver you used was forged.
> Remember that every time a transistor is replaced in a Power Amplifier, the BIAS setting must be performed
> To avoid such accidents, place the amplifier in a 100W series lamp until the amplifier is repaired.
Best regards

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pedroza2016
hace 5 años

friend thanks for your input I did not manage to repair the amplifier I did not find the fault and returned it to the client, but I took a GOOD experience and learning with this amplifier in advance thank you very much
until another opportunity that needs your help

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