NAD 214 AMP Shutting Down? Protection Mode

[brhokla]

Hi all, I'm new here and I was hoping to get some help, answers to a problem I have. I have two NAD 214 Amps and one of them is going into protection mode at about half the volume level. I have a Rotel 1056 receiver hooked up to these old amps and once I hit about 57 on the volume the NAD 214 goes into protection mode for a few seconds then comes back on. It will run fine as long as the volume is less than 57. If I turn it up to 59 or 60 it will turn on and off. I can unhook this NAD and hook the other 214 up and it plays fine all the way up to 80 or more on the volume level. Any ideas?

Oh, and I can take the speaker wires off the NAD and leave the Amp hooked up to the stereo and turn the volume nob to 57 or so and it shuts down into protection without speakers even connected so I don't think it's speaker wires, speakers. Any idea's would be appreciated! Thanks

 

[TLS Guy]

Hi all, I'm new here and I was hoping to get some help, answers to a problem I have. I have two NAD 214 Amps and one of them is going into protection mode at about half the volume level. I have a Rotel 1056 receiver hooked up to these old amps and once I hit about 57 on the volume the NAD 214 goes into protection mode for a few seconds then comes back on. It will run fine as long as the volume is less than 57. If I turn it up to 59 or 60 it will turn on and off. I can unhook this NAD and hook the other 214 up and it plays fine all the way up to 80 or more on the volume level. Any ideas?

Oh, and I can take the speaker wires off the NAD and leave the Amp hooked up to the stereo and turn the volume nob to 57 or so and it shuts down into protection without speakers even connected so I don't think it's speaker wires, speakers. Any idea's would be appreciated! Thanks

It is service time. Since this happens without the speakers connected, there is a problem occurring when the output section gets to a given voltage. This could be an output transistor breaking down, or a diode not holding back its specified voltage resulting in reverse current, a cap leaking before its specified voltage, or the protection circuit acting when it shouldn't. You won't fix this yourself, unless you have experience in service and extensive test equipment.