Hi there,
Just picked up a NAD 3220PE. Works pretty well except one speaker terminal seems to distort the sound. All the other 3 work fine, but if this one red terminal is powering a speaker it sounds verydistorted.
Any ideas on what this could be caused by?
Thanks a lot,
Tom
Just picked up a NAD 3220PE. Works pretty well except one speaker terminal seems to distort the sound. All the other 3 work fine, but if this one red terminal is powering a speaker it sounds verydistorted.
Any ideas on what this could be caused by?
Thanks a lot,
Tom
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The headphone jack has a built-in switch to turn off the speakers when you plug in the phones.
Try cleaning the switch contacts of that switch, or add a bypass jumper if you don't use phones.
Try cleaning the switch contacts of that switch, or add a bypass jumper if you don't use phones.
Yes, there's one switch per channel, each in series with the red terminal of each channel.
You can't clean that style of jack, but it might be replaceable if you want to use phones.
Otherwise, the simplest thing would be to short the switches out on the bottom of the pcb
with two jumpers.
https://audiocircuit.dk/downloads/nad/NAD-3220PE-int-sm.pdf
On the chance it could be a solder joint instead, first check the solder connections on the bottom of the board
under the speaker terminals.
You can't clean that style of jack, but it might be replaceable if you want to use phones.
Otherwise, the simplest thing would be to short the switches out on the bottom of the pcb
with two jumpers.
https://audiocircuit.dk/downloads/nad/NAD-3220PE-int-sm.pdf
On the chance it could be a solder joint instead, first check the solder connections on the bottom of the board
under the speaker terminals.
Hmm okay. Will have to try and find a replacement as I ideally want the option of using headphones. Seems like it will be quite an obscure part to find though.
I can send a photo of the bottom of the board tomorrow.
I can send a photo of the bottom of the board tomorrow.
Ok, then first check the solder joints underneath. If they are ok, get a can of spray cleaner and spray into the jack opening.
Plug headphones into the jack fully several times and check for improvement. Repeat if needed.
Odds of getting a suitable replacement jack are dubious at best.
If you short out the switches, the phones will still work, but the speakers won't turn off.
Plug headphones into the jack fully several times and check for improvement. Repeat if needed.
Odds of getting a suitable replacement jack are dubious at best.
If you short out the switches, the phones will still work, but the speakers won't turn off.
Behind that terminal is a whole amplifier.
It is much more likely that something in the amp causes distortion than that a simple jack causes distortion.
It would be a simple check to press the speaker plug firmly to the point on the PCB where the jack is connected.
If it still distorts (my bet) it's the amp.
But it might be a good idea to de-ox it to exclude a bad connection beforehand.
Jan
It is much more likely that something in the amp causes distortion than that a simple jack causes distortion.
It would be a simple check to press the speaker plug firmly to the point on the PCB where the jack is connected.
If it still distorts (my bet) it's the amp.
But it might be a good idea to de-ox it to exclude a bad connection beforehand.
Jan
Those spring clip speaker connectors can break internally even thoough they may not feel broken. If part of the clip breaks off it will not make a proper connection and may cause your problem. The first thing I would have done is remove all of them and put proper binding posts there so that you can use 4mm speaker cable plugs.
That's the spirit! Forget checking for the cause, just start to replace random parts!
Jan
Jan
I've just tried jan.didden's suggestion of powering the speaker by the PCB and the distortion was still audible.
Here's a comparison between the distorted and a normal terminal. Video was too big to upload here.
Nothing looks obviously damaged to me.
https://streamable.com/vul2fn
Nothing looks obviously damaged to me.
https://streamable.com/vul2fn
I think it is rather wire ends of parts. I would at any rate remove them, cut them off or something.
BTW In my experience, all tracks you played are similarly distorting. One a bit more than the other but there's tons of distortion in all.
Sorry.
Jan
BTW In my experience, all tracks you played are similarly distorting. One a bit more than the other but there's tons of distortion in all.
Sorry.
Jan
How about when using your headphones, can you hear the distortion in them?
The switches are not in series with the phones, and so will not cause distortion in them.
The switches are not in series with the phones, and so will not cause distortion in them.
There's no distortion in the headphones, and the distortion in my video could be from my phone or the speakers.
If you turn down the volume, does the distortion go down?
I realise it may be hard to discern but would be an important data point.
Jan
I realise it may be hard to discern but would be an important data point.
Jan