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Old 6th August 2005, 07:18 PM   #1
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Default NAD 214 protection relay

During low volume listening with a mains supply prone to spiking, my NAD 214 amplifier suddenly switched itself off and went into protection mode, i.e. there is now no relay click when the amplifier is switched on so the red light stays on rather than turn green. No sound is produced from the amp at all.

Obviously this is a problem with the speaker prortection circuitary, what do you guys suggest I look for to solve the problem? Is the relay burnt out? Can't see any cracks in the soldering, but as said before, any cracks could be very small.

A previous problem I had with the amplifier was that the nad 214 amp would lose a significant amount of sound level in the left channel, it would sometimes even distort significantly. Both these problems were solved by switching the amp off, then switching back on again. After switching back on, the amp would be fine again.

Any ideas???
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Old 6th August 2005, 08:34 PM   #2
Netlist is offline Netlist  Belgium
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I don't know that particular amp but both problems could be related to each other. First of all I would suspect bad solderings.
Next would be looking for exhausted caps. Measure the DC value at the outputs. If that's fine, let's say below 50 or so mV, a capacitor in the relay circuit could be the cause.

/Hugo
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Old 6th August 2005, 10:00 PM   #3
anatech is offline anatech  Canada
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Of course, the obvious, there is something wrong with the amplifier and the protection circuits are working as they should.

Check with a meter for DC offset on the outputs before the relay. I'm guessing the current trip is not involved as you didn't say anything about smoke or fuses.

-Chris
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Old 19th August 2005, 08:37 PM   #4
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Definitely the speaker protection relay. Apparently burn-out of the protection coil in the NAD 214/216 is fairly common.

I now need to find an appropriate replacement for the relay. The current part in the amp is labelled "Type DH2U, 48 VDC, TV-3" Made by DEC?

Anyone got any ideas for an appropriate replacement for this relay?

Cheers!!
Ben
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Old 19th August 2005, 08:40 PM   #5
anatech is offline anatech  Canada
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Hi Ben,
Pinout and coil voltage are the most important. Adjust the resistance in series with the coil for correct voltage across the coil.

-Chris
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Old 29th May 2011, 08:48 PM   #6
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Default Jesper

You have to get a new relay,it's worn.! You can use a "2 pole Finder Relay. 48VDC,8Amp Fabrik Prod.Nr;41.52.9.048.0010. PCB relay,DPCO" It's more heavy in use fore a longer life time.Make your solderings new,this will do it!
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