Question about NAD Audio Players & Recorders

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Nad 317 i have a nad 317, it goes into protect mode and stays there, from the second i turn it on and it just stays there no matter what i do. unplugged every wire, opened it up checked for burned circuits or burned things at all, everything looks intact. a guy helped me and cleaned where u put the speaker wires in. and it worked suddenly for like an hour. I turned it off myself and when i turned it back on it came back. And the same procedure didn't work. what could it be?

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  • 108 Answers

Check for leaky output transistors change emitter resistors

Posted on Jan 23, 2014

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Posted on Jan 02, 2017

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IB4G2008
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SOURCE: NAD 272 Channel drop out

well..this is one for the books. Can you tell me what the ratings are between the 252 and the 752 impedance matching wise? even though it might work sometimes, impedance matching can wreak havoc between mismatched amps.

what are you driving from the 752 into the 252?

Posted on Mar 10, 2008

  • 54 Answers

SOURCE: Nad 317 Amplifier No sound

Could be the speaker output relays. GOOD LUCK
BIGRED

Posted on Apr 02, 2008

  • 4234 Answers

SOURCE: Nad C370

Since the problem seems to be sensitive to the volume level, I would be looking at the output wave form for any DC current. Although the protection circuit should detect any DC present, it is possible that some is leaking through. Also, verify that the speaker impedence is correct. If the amp is seeing too low an impedence load, it will work too hard causing excessive heat which will shutdown the unit as well.

Keep me posted.
Dan

Posted on Nov 05, 2008

  • 4234 Answers

SOURCE: I have an av316 NAD,

Having the speaker wires hooked up backwords will not cause protect mode. If the wires were crossed (in other words shorted), that would. Disconnect all speaker wires, if the unit is still in protect mode, than the output transistors are probably shorted and the unit will again require service. Upon return from service, I would turn on the unit without speakers to insure that the unit at least works that far. Also, if you have an ohmmeter, measure across the speaker terminals. You should read either 3 or 6 ohms. If you read 0, the problem is a shorted speaker that then shorted the amp.

Keep us posted.
Dan

Posted on Jan 21, 2009

  • 1 Answer

SOURCE: Speakercraft DBB12100 Amplifier, Circuit problem

Sounds like its a problem with over heating. open unit clean out all dust and dust bunnies wich compressed air. check that all fans are opperating. (fans on 6x100 amp units or thermal controled). If amp goes into protection prior to fans turning, there is your answer. the @ power supplies will have a green light on the output side. if the light in on power supply is good. or you can check that the output voltage is at 48Vdc on both units.

Posted on Sep 18, 2009

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1 Answer

Nad 317 protection mode


Assuming the protection circuit is not faulty, I would look to the devices on the heatsink to the cause of the fault.

Jul 29, 2013 | NAD Audio Players & Recorders

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When I turn my amp on it stays on for one second and then goes into standby mode. I have unpluged it for five minutes and turned on again and no change.


It is possible that the amplifier is going into the Protect Mode as there are some errors in the board. The prime suspect can be the output section of the amplifer as it might be short therby comsuming higher current for the protection to activate.
Remvoe speakers to test, if not checck the output stages, disconnect power to confirm.

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The unit will not stay on


I got similar issue and managed to fix it with excellent tech support from NAD. Flashing LED means system goes in to protective mode. Most probable reason is presence of DC voltage on amplifier out puts. In my case it was both surround amps. It had faulty resistor and a dry jpint at power line

Dec 16, 2009 | NAD T760

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Nad C370


Since the problem seems to be sensitive to the volume level, I would be looking at the output wave form for any DC current. Although the protection circuit should detect any DC present, it is possible that some is leaking through. Also, verify that the speaker impedence is correct. If the amp is seeing too low an impedence load, it will work too hard causing excessive heat which will shutdown the unit as well.

Keep me posted.
Dan

Nov 04, 2008 | NAD C370 2-Channel Amplifier

2 Answers

HELP PLEASE. NAD 370 JUST DIED...


This could be as simple as a bad connection at the voltage regulator IC or blown output transistors. If you have a multimeter and some experience with electronics repair, this should be fairly straightforward.

Let me know and I'll try to walk you throught the repair.
Dan

Sep 07, 2008 | NAD C370 2-Channel Amplifier

1 Answer

Stuck in protect mode


Speakers shorted out, blew a fuse. Replace the unit or (cross your fingers and) open up the box and find the blown fuse.

Nov 23, 2007 | Sony STR-DE425 Receiver

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Amp staying in protection mode


No, this amp is not a heavy power consumer- matter of fact it takes very little power to run.Maybe you should check the fuses on the amp to see if they are what is recommended.Also check your fuse kit to your amp- your fuse might not be big enough.If neither works take it back where u got it.

Jan 01, 2007 | Soundstream XTA880.2 Car Audio Amplifier

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