It's back! After having been back to Naim it appeared to be sorted appart from the occasional loss, lately it's happening quite regular,4 or 5 times a week & twice today. I'm thinking of giving up & moving onto something more reliable even if it does come with a drop in quality. Is there anyone outthere who has an idea what can cause this.

Charlie

Hi Charlie,

Exactly what are you refering to?

paul can you have a look at nvi thread, johnr
having trouble opening drawer, reset?

quote:

Originally posted by AV@naim:
Hi Charlie,

Exactly what are you refering to?

Sorry I should have explained better.

When changing from one input to another the signal is lost & the only way to get it back is to switch off then on from the rear.

Previous thread : http://forums.naim-audio.com/eve/forums/a/tpc/f/7801938...072998407#6072998407

quote:

Originally posted by Paul Stephenson:
paul can you have a look at nvi thread, johnr
having trouble opening drawer, reset?

Hi Paul, just responded, I'll mail you via work mail remotely.

Charlie,

I assume you mean when you change inputs on the AV2 between say an analogue input to digital or digital to another digital input etc..?

-whats the source(s) and connection type?

-does it do it on all digital and analogue inputs, or just one type, if so which one?

-once it locks, does it stay ok if you don't change input?

-how long ago was it returned to naim?

-is the firmware AVC0107/F658 (see faq on how to get firmware)?

-have you got more than one input labelled the same? This is a classic one, if you set say C01 and C02 as DVD (when you only use C01), then you can end up switching to an input not in use (C02). Check the setup menu labelling (see around section 18 of the combined DVD5/AV2 manual).

http://www.naim-audio.com/download/man_dvd5-av2_english.pdf
(right click, save)

I assume you mean when you change inputs on the AV2 between say an analogue input to digital or digital to another digital input etc..? Yes

-whats the source(s) and connection type? Sky HD (opt1), V+ (opt2), DVD5 (co1), Blu-ray (co2) & HD DVD (Mulri)

-does it do it on all digital and analogue inputs, or just one type, if so which one? It can be any

-once it locks, does it stay ok if you don't change input? When it's working (most of the time) it's great.

-how long ago was it returned to naim? Summer 2006

-is the firmware AVC0107/F658 (see faq on how to get firmware)? Yes

Charlie

P.S. Took it out of standby this morning & had no signal (opt1), I had to switch off then on from the rear again.

Charlie,

I'm not an expert on this (and I've leave this to the Naim guys). But, I had difficulties on my AV2 locking up all over the place when I connected a Mac Mini up via coax into the AV2. AV2 would just hang, not change inputs, not respond to IR.

Perhaps try disconnecting the Blu-Ray and/or HD-DVD player to see if it helps any ?

Roy.

It sounds to me, seeing as its happening between digital inputs only (this is in no way 100% final diagnosis), that the SPDIF multiplexing chip is not working correctly. Whether this is because of external format or actual faulty hardware I cannot say.

Do you know what formats you are firing down the cables? (44.1, 48, 96Khz etc)

Did it start after adding a source?

If it still does it if you were to switch say, between analogue sources (say AN1->AN2 - if you can hook up a couple of analogue sources), then this would suggest otherwise.

Not what you want just before Xmas...

Unless your dealer can loan you something ASAP, I'm afraid its a case of waiting until naim re-open in Jan '08.

quote:

Originally posted by Roy Donaldson:
Charlie,

I'm not an expert on this (and I've leave this to the Naim guys). But, I had difficulties on my AV2 locking up all over the place when I connected a Mac Mini up via coax into the AV2. AV2 would just hang, not change inputs, not respond to IR.

Perhaps try disconnecting the Blu-Ray and/or HD-DVD player to see if it helps any ?

Roy.

Hello Roy, the BD & HD DVD are both quite new + it was happening before they where added so I can't imagine it being them that's causing the problem, but thanks for the suggestion.

quote:

It sounds to me, seeing as its happening between digital inputs only (this is in no way 100% final diagnosis), that the SPDIF multiplexing chip is not working correctly. Whether this is because of external format or actual faulty hardware I cannot say.

I believe that was changed the last time it went back.

quote:

Do you know what formats you are firing down the cables? (44.1, 48, 96Khz etc).

I haven't got a clue, it's just DD, DD 2.0 & DTS.

quote:

Did it start after adding a source?

No

quote:

If it still does it if you were to switch say, between analogue sources (say AN1->AN2 - if you can hook up a couple of analogue sources), then this would suggest otherwise.

It happens intermittently, sometimes not for a few weeks so using analogue connections & waiting to see if it happens is a bit off putting.

Thanks, Charlie

quote:

Originally posted by Charles Paterson:
It happens intermittently, sometimes not for a few weeks so using analogue connections & waiting to see if it happens is a bit off putting.

Thanks, Charlie

Yes that would be annoying.

Do you turn the unit off in to standby or off at the mains every time? Mine went a bit crazy once after a power cut, but I only ever leave mine in standby and its been fine with the latest release.

Standby, I only use the mains when it throws a wobbly (quite often these days ).

Well!!! 2 weeks without it losing the signal, Then 3 times in 2 days, touch wood! hopefully it'll settle down again to just once in a blue moon. When it throws these fits that's when I start looking at other processors that seem to be more reliable (Lexicon & Meridian so far).

Charlie

P.S. Am I the only one with this problem ?

Hi Charles, I have had similar problem. I have been using the AV2 for a year now and had no problems at all until last week. Now I am getting no signal from Coaxial Digital input #1. All I get is just get no signal flash up and 3 flashing bars and no audio but if I put it in Coaxial Digital #2 it works fine. I have not change anything on my setup or added anything components. It has just stop working.

My version of firmware is AVCO106 F658, if I update my firmware will this solve the problem.

What did you do to solve the problem?

I still have the problem . To clear it I have to power it off for a minute or two then hope it's OK (for a while anyway).

Charlie

I am sorry to hear that. I take it you have updated your firmware as well and this didn't help. I was told this was suppose to solve the problem. Powering it off is a pain, there should be a way to fix this. I will see if I can solve the problem and will let you know.

Sounds like Charlie's issue is different, iknowwarren, yours works on coax 2 but not 1. fairly cut and dry.

AVC0107 F658 probably wont help in your situation. I think yours is hardware

I wouldn't be thinking of changing to Meridian....in a national dealer only survey meridian kit had a 70% fail rate.

Though I can understand you r reasons for thinking of changing. It doesn't quite do Naims alleged bombproof reputation much good.

Hope you get it sorted soon.

Ryan

quote:

Originally posted by ryan_d:
I wouldn't be thinking of changing to Meridian....in a national dealer only survey meridian kit had a 70% fail rate.

Though I can understand you r reasons for thinking of changing. It doesn't quite do Naims alleged bombproof reputation much good.

Hope you get it sorted soon.

Ryan

Well that rules out the Meridian.

In all honesty I would prefer to keep the AV2 because when it is working it sounds GREAT, I'm not in a possition to get to the mains so when it happens more than once in one night I'm stuck & have to just settle for the sound from the TV until morning. That's why I need the reliability.

Charlie

Just a quick chime in–if the dropouts occur on Sky or V+ (for you folks in the U.K.), we've had similar experiences with Time Warner boxes over here–in many cases, it's issues with bad digital headers sent from the satellite or cable receivers. It even varies with cable TV provider–using the exact same box with different firmware (localized for each provider), you get different results in different parts of the U.S. (Cox, Comcast, RCN, etc.)

There's a fair bit of noise on various discussion groups regarding these issues–for me, I changed to OTA HDTV reception (that's HD Freeview to you folks) and have never looked back (barring the rare late-night engineering screwup on the local stations, no problems here).

If, on the other hand, it fails when set to the DVD5 alone, well....

Ryan

When was that survey and by whom? Meridian had loads of problems when they originally launched the G-Series but that has pretty much all been sorted out as I understand it.

We have played about a bit briefly with Meridian's G95 competitor to the n-Vi. It seems quite reliable with no glitches.

It's remarkable how close the two units are in performance. Both run out of steam at about the same time, even though the Meridian is rated at 100wpc to the n-Vi's 50wpc. The Meridian has the scaler built in already. If the reports of the scaler card being about £500 are slightly optimistic, then a scaler'd FM'd n-Vi would be similar money to the G95. This means that the only real differentiator would be outright performance.

Musically I prefer the extra pace of the n-Vi to the (more cultured?) Meridian sound. Video-wise I'm not sure which I prefer.

quote:

Originally posted by David Dever:
Just a quick chime in–if the dropouts occur on Sky or V+ (for you folks in the U.K.), we've had similar experiences with Time Warner boxes over here–in many cases, it's issues with bad digital headers sent from the satellite or cable receivers. It even varies with cable TV provider–using the exact same box with different firmware (localized for each provider), you get different results in different parts of the U.S. (Cox, Comcast, RCN, etc.)

There's a fair bit of noise on various discussion groups regarding these issues–for me, I changed to OTA HDTV reception (that's HD Freeview to you folks) and have never looked back (barring the rare late-night engineering screwup on the local stations, no problems here).

If, on the other hand, it fails when set to the DVD5 alone, well....

It does normaly happen on these but are used most of the time.

I now have all the audio going through my Lumagen to co-ax1 on the AV2 & it still happened, tried co-ax2 with the same result.

Charlie

P.S. G95 looks nice.

Frank,

I'm not exactly sure. Was talking about other makes of kit with my dealer at the weekend and he mentioned it. I assumed that it was a fairly recent thing. He stated he quite liked meridian kit but the reliability of it and the survey had put him off it.

I'm not a great fan of their stereo it but was quite impressed by their home cinema stuff, but thats to do with personal taste and nothing to do with reliability.

Ryan

quote:

It does normaly happen on these but are used most of the time.

I now have all the audio going through my Lumagen to co-ax1 on the AV2 & it still happened, tried co-ax2 with the same result.

Charlie

Sounds like the source boxes are at fault–unless the Lumagen can give any indication of signal lock or drop.

I have the:
DVD5 - CO1
LUMAGEN - CO2
PC - OPT1
I switched from OPT1 to CO2 & lost the signa, now surely that would rule out Sky or V+ causing this.

quote:

Originally posted by David Dever:
Just a quick chime in–if the dropouts occur on Sky or V+ (for you folks in the U.K.), we've had similar experiences with Time Warner boxes over here–in many cases, it's issues with bad digital headers sent from the satellite or cable receivers. It even varies with cable TV provider–using the exact same box with different firmware (localized for each provider), you get different results in different parts of the U.S. (Cox, Comcast, RCN, etc.)

There is a dealer function on the n-Vi for compensating for "incorrect" header info being sent from sources (obviously Dave you are aware of this). It seems to work in most cases...although this doesn't help Av2 owners, including myself.

quote:

have the:
DVD5 - CO1
LUMAGEN - CO2
PC - OPT1
I switched from OPT1 to CO2 & lost the signa, now surely that would rule out Sky or V+ causing this.

Not necessarily–if you switch from OPT1 to COAX2 and lose signal, what happens when you then switch to COAX1–does the signal return (signal locked, audio is decoded, sound produced, etc.), or does the AV2 decoder board "stall"?

In general, a video processor that provides any sort of audio delay (e.g., lipsync) should indicate that it has locked onto the bitstream signal prior to buffering–OTOH, if it is merely switching the signal, then you ought to try a direct connection.

VMC is entirely correct (who'd have guessed!) in that the n-Vi is much more tolerant of this than the AV2.

I only just started using the audio on the Lumagen, until last week all connections were direct. Once the signal has gone it doesn't matter what input or signal you switch to analogue or digital, the only way to get any sound is to power off then on.