Sod's law

Sorry to hear that. Have you tried a swift jab with a little finger as opposed to a soft push? That will sometimes make it latch. 

Good luck. 

John. 

It was a dealer fix with my old 300PS -same day. He took the sleeve off, removed the old switch and soldered in an exact replacement for around £40.00

I also found the swift jab technique worked too as a temporary measure

My dealer suggested letting the switch flick back out with the power lead disconncted when I phoned him this morning, in case it wasn't coming out fully. Will try it when I get home and if that doesn't work maybe jabbing it again, I did try last night but nearly knocked the Fraim glass off the balls, I'll have to hold the back next time.

That could work. It was interesting seeing the switch when the case was removed. The black facia button sits on a spring in front of the switch shaft-proper and in my case it wasn't the black plastic button on a facia sticking, it was the gubbins behind not latching which  is why a quick flick (with power off as your dealer suggests) could help free things up internally. Just leave it well alone if it works

A press in and sliding the finger off it so that it sprang out did the trick, back up and running now, thanks for the suggestions though.  Seems that it wasn't coming fully out.

Now I need the patience to let it warm up before assessing the plug order change.

Question is ; are you going to have the courage to switch the amp off if the plug order needs changing again.

Not until after Christmas I bet!

I have the opposite problem. The switch on the 500PS will not switch off. Not going to touch it in case I end up with the reverse. Full service and DR will sort it in 2017.

Dave

Already done I disliked it so much. The order I had was 500, 552, SC(SL), 555ps(CDX2). This had greater resolution but lost the swing, I now have the 555ps where the 552 was to get the signal earth nearer the inlet. This has kept the resolution but brought most of the  swing back. I can let it warm up like this I think. The power switch is working perfectly now. ( How's that for tempting fate?)

Lucky! Worth getting it done as part of a service if nothing else. Mine would behave for 3-4 cycles and then play up when I  least wanted it to!

Bodger posted:

I have the opposite problem. The switch on the 500PS will not switch off. Not going to touch it in case I end up with the reverse. Full service and DR will sort it in 2017.

Dave

I have the same problem and have had it fixed twice but it soon reverted back to not being able to switch the PS off. So when I need to switch off, or on for that matter, I have to do it via the wall socket.

I first had it fixed by my supplier then as part of a Naim DR upgrade/service but in both instances it only worked for a month or so.

Not a mega issue as I do not power down very often but I am beginning to think that there is a design fault as it seems more common than I would have expected.

Richard

It's just come back from a service and Dr-ing 2 1/2 months ago so the switch was either changed or should have been, probably a little stiff if it's new. Time will tell, hopefull when Naim aren't in the middle of stock taking before a closedown so they can send out a spare.

The plug order trial didn't last long. In the first alternative as detailed above, I heard instruments I'd never noticed before in the mix and could follow any instrument line I could hear within it but it didn't flow. Got some flow back by promoting the 555ps to 2nd place. By now I had the Moulettes Constellations (complex prog folk) on the turntable. By the time I got half way through Schubert's B flat trio with Oistrakh, Knushevitsky and Oborin I'd had enough. Still the clarity and flow but when I reverted to 555ps,SC,552,500 they were a chamber ensemble enjoying themselves and playing off each other rather than just playing together in a space. Instrument harmonics were richer (the clarity was partially their loss) and the last side held my attention to the end which seemed to come way too soon. The rest of the system is an Elite Rock on Townshend bellows feet with a merlim ps, an Aro(sKale), Proteus and no trough. Speakers are NBLs with A5 and lavendar ic from the supercap to 552.

Seems like as with the unplug/ plug session, one should add a switch serving session. With the powercable off, repeat serving the power button before powering up again. Every 6 months or so. 

S

Stover posted:

Seems like as with the unplug/ plug session, one should add a switch serving session. With the powercable off, repeat serving the power button before powering up again. Every 6 months or so. 

S

I seem to remember Naim stating the relays in  the 552 had been tested for a number (several 1000's I think) of operations.

Wonder if they test the power switches for reliability?