Receiver protection mode troubleshooting

[chrisleach185]

Receiver yahama RX- V383
turns on and shuts off . After 3 times goes into protection mode. I reset the receiver turning protect off. How do I diagnose the problem?

 

[jsmithepa]

It would help if you can procure the schematic.

I would inspect the output capacitors, look for sign of burn/bulge.

I would inspect for liquid damaged, burn, dark, overheated components.

I would measure output transistors with ohmmeter for typical junction voltage drop of ~0.6 volts but if they are MOSFET then I don't remember off the top of my head what they should be.

Youtube videos may help.

 

[Kursun]

Check the speaker cables. Seems like a short circuit.

 

[jsmithepa]

Check the speaker cables. Seems like a short circuit.

This would be palm-on-face worthy.

 

[Kursun]

what do you mean?

 

[Kursun]

Shorting at the loudspeaker terminals is number one cause of such failures.

BTW for many decades now, audio amplifiers don't use output capacitors. The have direct-coupled capacitorless output.

 

[chrisleach185]

It would help if you can procure the schematic.

I would inspect the output capacitors, look for sign of burn/bulge.

I would inspect for liquid damaged, burn, dark, overheated components.

I would measure output transistors with ohmmeter for typical junction voltage drop of ~0.6 volts but if they are MOSFET then I don't remember off the top of my head what they should be.

Youtube videos may help.

 

[Kursun]

Eh?!!

 

[chrisleach185]

Haventran any wires plugged it in , powered on and shuts off in 2 seconds. Checked compositors and and burns on the board with no signs of damage. Don't have a meter right now. I know there's certain resets you can do but not sure what I'm looking for yet. Also software update but haven't got that far. Hoping it was a common problem with a simple solution. I'll keep researching

 

[chrisleach185]

YouTube was the 1st step of research. Haven't found my Particular problem yet. .