6pack135 failure

Fair play to Phil there well done for sorting it & I agree it would be useful if Naim had manuals available for its 'legacy' products.

Its a good point - about the older manual. Which has been made on here before - and nothing has happened.....    

Glad all six 135's now working.....   

Phew! Bet you had the DBLs at your normal volume level Jon. Great service from Phil, as usual. 

It would certainly be handy to have a single online source for all Naim manuals, although a google search normally finds one somewhere. 

Regarding the 135s, could the shutdown point to an underlying problem somwhere?

I've asked before for the old manuals to be put on the website. Hopefully there's no particular problem in doing so, but I'll find out. I'll drop a gentle reminder when I'm next down at the factory in September.

I have quite a collection of old style Naim Audio manuals and have found two (so far) on amplifiers, one of which has 'layered' pages. They both describe a situation where the regulated power supply shuts down if more than 18 amps is drawn for >10 microseconds. In this case the power light remains on. This appears to be the case described by Jon. In this event, the instruction given in the manuals is to turn the amplifier off for two minutes, which was precisely the advice offered by Phil. 

Have a look at the downloads section of the Class A website (I don't think I can link to it here). Darran has the manuals for the CBs and olives there.

Wow, that's a horrible scary event, and with the prospect of having to get repair or replacement and the time needed to do it!

Glad it got sorted so easily for you, and much kudos to Phil (even if he doesn't use their speakers). 

Wow now that's service and knowledge, did he also recommend any wipes (lol) must admit I'd have wet myself with worry.

Reminds I have an old dealer folder something for all the old gear - must find it

I've downloaded all my Naim manuals and connection guide etc into dropbox  with off line viewing worth doing manuals always on hand.

but why did both NAP 135 shut down to begin with? Are they in need of a service?

1 to 0 for the Steinway?

Well it was probably related to the piece of state of the art test equipment I was using to measure something connected to the 52... I had probably better stop there before I incriminate myself further...

Clive B posted:

They both describe a situation where the regulated power supply shuts down if more than 18 amps is drawn for >10 microseconds. In this case the power light remains on. 

Are there different shut down circumstances when the amp shuts down and the power light goes out?

Chris Dolan posted:

Clive B posted:

They both describe a situation where the regulated power supply shuts down if more than 18 amps is drawn for >10 microseconds. In this case the power light remains on. 

Are there different shut down circumstances when the amp shuts down and the power light goes out?

Blown fuse, blown bulb (on early one), blown something...

I was thinking of something a bit more subtle - but I take your point 

A blown bulb won't shut the amp, I'm currently looking at 4 bright green lights and 2 not so green 

all is sounding good 

back to the original point, I would be more concerned as to why the amp tripped especially as it was the tweeter pair

ive tripped them in the past with briks but they are harder to drive but only the bass amps

surely you would fry the tweeters before tripping the amps ??, once again loads of experience with this when I had the old briks

lyndon

Lyndon, if you trip out the amp and the bulb blows then that would give a scenario where the amp shuts down and the light goes out.  But seriously, my point is that if the amp shuts down and the power light goes down then check the mains plug fuse, then the inlet fuse - either of those may have blown. If the latter is the issue then try a replacement, and if that blows then it's time to have the amp checked over by Naim.

Richard 

once again I've had a few fuses blow, all on the power amps

either just after serving or re- connecting everything again 

if I had a blown fuse which then blew again on replacement then I would get the amp looked at

ive grown to learn these 6 packs can be pretty sensitive and their wiring pretty intricate 

once all up and running they are best left alone 

lyndon

A question for the learned?

The lights on my 135's don't work.

Despite several replacements, they only last a few weeks.

The 135's are recently serviced, the first few replacement globes were supplied then we just gave up?

With the lights out, it's less dangerous. 

lyndon posted:

Richard 

once again I've had a few fuses blow, all on the power amps

either just after serving or re- connecting everything again 

if I had a blown fuse which then blew again on replacement then I would get the amp looked at

ive grown to learn these 6 packs can be pretty sensitive and their wiring pretty intricate 

once all up and running they are best left alone 

lyndon

Are you using Naim speaker cables?

Hi Jon,

Your 135 lights are on because there's power applied and the amps are live. The output may be disconnected but the rest of the amp is still powered up so simply a safety issue.

For the rest there's something really funky going on. For 2 amps to shut down at the same time is very unusual unless they were both overdriven, which with healthy tweeters would be difficult, given that the amps are only fed tweeter range frequencies from the NAXO and tweeters don't demand or take high current.  Shutting down usually happens in the presence of a fault condition but in this case you would need to have the same fault on both channels.

If I was you I would reconfigure my 135s and swap the tweeter and midrange units around (changing both input and output obviously) so you can actually evaluate the quality of  sound coming from the current tweeter amps (its really difficult to evaluate an amp based on tweeter performance) and see if the 2 amps give any further problems when connected to the midrange drivers.  If they do, you know you have an amp problem, whereas if the new tweeter amps have any further issue you have a speaker problem.

If nothing more happens then its coincidence that both amps shut down at the same time, highly unlikely.

You may want to check with Naim is there are other conditions beyond excess current that can cause 2 amps to shut down simultaneously, excess heat for example.  

I think me doing rude things with some test equipment was probably the fault cause... sending impulses through the system with the volume accidentally raised wasnt wise... and thank goodness the dibble tweeters are reasonably robust, given there are no spares.