Mu-so. Ghost inside the machine.

Posted by: Doug E Walker on 01 January 2018

Hi everyone, happy new year.

I recently picked up a knowingly 'dead' Mu-so. Dead in that when powered on it shows no signs of life at all.

Having checked all the obvious points like power cable and fuse, I opened the case for a prod around. In case you're wondering, remove the 8 screws in the speaker arrangement plate and gently ease this forward. After that it's just a matter of noting which wire goes where for the speakers, removing the front WiFi board and unplugging the remote receiver plug. You then see the bass reflex tube, jog dial assembly, a bunch of wires for ethernet and usb etc etc

You then see a pair of legs..... and a tail!!! I'm not kidding.

The bass tube is removed quite easily.

The half melted 'dead' field mouse is then peeled away from the PSU heatsink. Absolutely brilliant.

The exit for the bass tube internally is directly next to the PSU, with it's associated transformers, mains conditioners and capacitors. He didn't really stand a chance.

The rear full length heatsink is also the mount for the two circuit boards, on the right is the PSU board, the left one is everything else (amps, DAC, DSP, CPU etc). There are also a couple of daughter boards. Between both is a rear WiFi receiver card, the Bluetooth card is stuck on the left side panel. To be honest, it's not very busy at all, the amp section is visually 'unremarkable'.

There is power flowing to both main boards, and to all speakers, however absolutely no signs of life at all. Not a sausage. Factory reset does nothing of course.

I'm pretty confident that swapping out both boards would make this a working unit again, it doesn't appear to be hard at all, 1 hour tops.

Does anyone have any experience with obtaining Mu-so spare parts in the UK? I'm aware that they're assembled in China, not Salisbury, so doubtful.

And yes, they'd be expensive too wouldn't they.

Posted on: 01 January 2018 by David Hendon

You need to talk to Naim's service Dept. It almost certainly won't need new boards and they will be able to sort out what is wrong easily. But you will have to put it together again and send it to Salisbury (via a dealer).

best

David

Posted on: 01 January 2018 by Japtimscarlet

Really don't think you are allowed to discuss self repairs on the forum....

Posted on: 01 January 2018 by Doug E Walker

The rules state 'modifications', I wish to fix the original. Please advise if this is not correct it perhaps direct me to the rule please?

Posted on: 01 January 2018 by David Hendon

You occasionally see forum posts about members fixing things that Naim can't supply bits for any more, but these are usually cosmetic things (with the honourable exception of a detailed recent post about changing the CMOS battery in an HDX). I have never seen a post before from anyone who had dismantled a muso and I think there will be little knowledge about the details of the muso electronics amongst forum members, unless one of the authorised service centres outside the UK joins in the thread.

Assuming you are in the UK, Naim's service dept is very efficient and generally not too expensive, but having said that I don't know what they charge for fixing low price items like muso and transporting the unit to Salisbury and back to your dealer will be chargeable unless it's under warranty and you use the supplying dealer to arrange the repair.

best

David

Posted on: 01 January 2018 by Gazza

 MUSO is not a serviceable item by Naim, I think depending on the age and circumstances they might come to some sort of deal on a new one, that’s what my dealer told me. They often refer to refurbished units but they are John Lewis returns mainly, customers say they do not like, J Lewis give them their money back and the unit to Naim. Best talk to Naim or dealer?

Posted on: 01 January 2018 by Doug E Walker

Thanks David and Gazza, I'll have a word with my local dealer in Bristol. I appreciate your replies.

Regards

Posted on: 01 January 2018 by Richard Dane

DIY on Naim equipment falls outside of forum AUP.  Talk to your Naim dealer or give Naim customer service a call tomorrow - do note though that AFAIK Naim do not service the Mu-So at the factory.

Posted on: 01 January 2018 by sjw

Only out of curiosity.... who does service Muso's? 

Thanks

Posted on: 01 January 2018 by Richard Dane

SJW, I don't know. I would guess that they would need to be returned to the factory where they're made, but to be sure it's probably a question best asked of Naim.

Posted on: 01 January 2018 by blythe

What nationality was the mouse? Do you think it was UK or Asian? Is it something all owners should be aware of and maybe fit some steel mesh to the port?
Amazing story by the way!

Posted on: 01 January 2018 by Gazza

They are not serviced.......very strange, not even a 3 rd party recommendation, just binned?

Posted on: 01 January 2018 by Doug E Walker

It was a British field mouse, they are tiny. I'm certain it was its first venture into the unit, there was no signs of habitation, only it's demise I'm afraid.

Posted on: 01 January 2018 by blythe

An unfortunate ending and shows that in the UK, we need to be careful and aware of such possibilities.
Perhaps a good electronics engineer will be able to repair the PSU or other board?

Posted on: 01 January 2018 by Doug E Walker

Nintronics in the UK sell reconditioned units, so this proves there's some servicing done on faulty Mu-so's. I've heard mention of a £550 fee plus your broken unit as an exchange option. Hence my reasoning behind wanting to do the repair myself.

Will be taking the box into my local Naim dealer this afternoon. I'm not being cheap here, but personally I don't see any low cost option for a repair. £550 plus what I paid for the unit is about the same as a recon'd unit.

Alternatively, I could sell the broken unit as the best looking mouse trap on the planet!! Bingo.

Posted on: 01 January 2018 by Bob the Builder
Doug E Walker posted:

Nintronics in the UK sell reconditioned units, so this proves there's some servicing done on faulty Mu-so's. I've heard mention of a £550 fee plus your broken unit as an exchange option. Hence my reasoning behind wanting to do the repair myself.

Will be taking the box into my local Naim dealer this afternoon. I'm not being cheap here, but personally I don't see any low cost option for a repair. £550 plus what I paid for the unit is about the same as a recon'd unit.

Alternatively, I could sell the broken unit as the best looking mouse trap on the planet!! Bingo.

It isn't a space ship as long as you replace like for like I cannot see why either yourself or a competent repair man couldn't do the job. Have you thought about emailing Darran at Class A?

I have to say though I find it a bit poor that Naim have sold this under their brand without the usual service promise.

Posted on: 02 January 2018 by Gazza

As mentioned I think you will find that reconditioned, is returns, checked and then resold. Happy to be proven wrong, as I have a Muso and I am repeating what my dealer told me.

Posted on: 02 January 2018 by Doug E Walker

Thanks Bob, I've emailed 'Class A'.