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Hi there,i own a nad 319 amp and when it is turned on it now displays protect on the front pannel,regards andy

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It can be many things that makes it go into protect. First check output transistors. Check R347/R348 on output L/R channels. Also a common problem are broken resistors on PSU (power supply unit) like R243, R245 & R248. Check also +/- 60V, +/-67V from PSU, normally this voltage will not make it go into protection if missing, just bad sound.

Posted on May 17, 2017

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Check the gain settings are not set too high as it is clipping.. you should check the out put settings arent set too high to on the input side of thigs... you might be overloading

Posted on Jul 13, 2010

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1 Answer

Nad av 716 protect


If your NAD amplifier is in protect mode with no speakers connected, it will be necessary to open it up and check for internal component failure.

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That could indeed be the issue, but you must check your speakers, wiring, and also the oupt stages for problems. Maybe the prtection circuits are actually doing their job. lol

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Nad c370 keeps switching off


Check the speaker wiring for shorts, a common problem. If everything checks out there may be bad solder joints on the main board especially in the output stage, or there is a fault in one or more driver transistors.

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NAD M3 power light turns red immediately and PROTECT message displays. Amp keeps functioning but volume control doesn't work up or down.


Hello
Check the connection to speaker with this amp, for any short or any other fault. disconnect the outputs, ie, speakers from the amp, and switch it On, and see the protect display comes or not. If it comes, the fault is internal and the set need service.
Your M3 dual Mono integrated amp, is of high output power and its outputs are protected against any overload or short circuit. If the system detect any among this condition specified above, it will show protect mode display.
Never load this amp, as protection display is there, as it may damage the speaker or its internal power amplifier section circuits, may cause more money to get it repaired. OK.

Jan 23, 2012 | NAD M3 Master Series Integrated...

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NAD 3150 doesn't play any sound


I, too, have the 3150 and have experienced problems with it. With me the INPUT knob is touchy and needs micro turns sometimes to get both channels to come through. Also, it sounds like the pots are dirty as I get a scratchy sound while adjusting the knob. I have been told that these units are great middle of the road audiophile units. Actually, for the price of a used unit you can't do better. I just had an NAD 2400 THX amp delivered today and am using the 3150 as a preamp. My girlfriend is not feeling well and sleeping in the bedroom, though, and I can't listen to it :( The few minutes I heard of Steely Dan's Cousin Dupree made me bout **** myself (until I got the dirty looks). Sorry I wasn't more help! Goooooo NAD!

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I have an av316 NAD, surround sound Amp. Just got back from repair. The wires to the speaker may have been reversed when hooking, the amp went into protection mode, can I fix this problem. It wont come out...


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

Jan 20, 2009 | Audio Players & Recorders

1 Answer

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

1 Answer

Climbing DC offset then protection mode


Hi there

Firstly, check for conductive hold down glue about the output stages. This can cause the problem you have. Or there may be a failing component somewhere in the output stage of that channel. Check for leaky transistors,diodes an capacitors. You will need to remove semiconductors to check for leakage, If you dont have alot of experience faultfinding amplifier power stages, I suggest you take it to a NAD authorised service center.

regards
Graeme

Mar 27, 2008 | NAD C370 2-Channel Amplifier

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