Question about Yamaha RX-V392 Receiver

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I plugged in the CD Player Out into the Phono In jack on the back of my Receiver Yamaha RX V382 and turned up the volume to 1/3 at what point I heard a bang out from one of my loudspeakers. From that moment on, turning of the Volume button louder would result in a complete power off of the Receiver (at approx 20-25% of the button turn up). I unplugged the unit. I checked the Impedance position switch on the back both in the 6 and 8 ohm positions), disconnected one by one the loudspeakers attached but nothing worked. Whenever I start the unit in Tuner, or CD mode the volume goes up to a point, then some relay clicks inside and the unit powers itself off. Is there any way to reset it, or have I damaged the amplifier unit? Thank you

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The first thing I can say is that the CD player should not have been connected to the phono jacks as this is for a record player, therefore you amplified the CD player output greater than what it should have been!
Next a damaged loudspeaker could cause problems to the amp. A simple test is to connect each speaker (disconected from the amp) for a second to 1.5 volt battery. You should hear a pop sound from each of the speakers and make certian that each unit inside the speaker pops too. If the speakers are 8 ohm set that switch at 8. Never connect 6 ohm speakers with it at 8! Check the cables are good and are not shorting out.
If I was you I would have a look inside the unit and have a look at the semi-conductors on the heat sink. You might see damage! If they are transistors you can put an ohm meter on the transistor terminals (B,C,E) (amp power off). If any act like you have just touch the test probes together, you have a shorted part and the reason it shuts down.

Posted on May 01, 2010

Testimonial: "Thank you, it helped me continue try with a different set of loudspeakers (8Ohm)on the jacks for the second set of speakers out (B). It worked fine. Then I replugged the original set of speakers (6ohm) on A and made sure + line out goes into + in on the speakers. It worked again. However, before this incident I could use speakers of 6ohm on A and 8ohm on B at the same time. I am not sure what was the problem and if there is stil some form of intermittent fault or damage..."


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