Question about Kenwood VR-407 Receiver

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No audio output

When i turned on my home theater vr-407, there's power but no audio output. I had already replaced the power IC STK____ but still the same problem i encountered.May i know what are the next possible causes.

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If you already change the STK still not working,next step you do is to checked the resistor; the transistor ;capacitor(electrolytic only) and the diodes only in the power Amp section,where you change the STK,checked them out that they are, connected to the pins of the STK, one cut out or breaks can cause no audio out,,most sign of spare busted is the resistor is going to change the value of the resistance or open ; the capacitor is shorted ;open or leak;the diodes shorted or open ;transistor shorted or open;;that are common defects,you better look first the resistor ,there is limiting resistor to limit the source maybe that is the problem also,try this option this very of that problem of yours ;if ever my answer help to uderstand the problem please rate me as a fixya...

Posted on Jun 20, 2008

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Try this check the connection firts because that's one of the most common thing to check, then check the adapter switch left on (either on front or rear panel) and checj for missing jumpers on the back.... pre-amp out to main amp in, if still the same problem it will goes down it replacing a piece of sound amplifier inside it just liek what happen with mine.
Hope that helps...........

Posted on Jun 20, 2008

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Check the last output stage before the speaker output. A blown diode may have caused back emf to blow the power transistor.

Posted on Jun 20, 2008

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Hmmm...did you check the speakers to ensure that there is no short?

Posted on Jun 20, 2008

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Check whether the plugs are inserted properly and check whether the pins are working properly

Posted on Jun 20, 2008

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hello, if you dont have the user manual you can get from this link
http://www.retrevo.com/support/Kenwood-VR-407-Receivers-manual/id/480ag200/t/2/
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http://www.retrevo.com/support/Kenwood-VR-407-Receivers-manual/id/480ag200/t/2/




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