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"Rules of thumb" which are not "terms and conditions" and most likely lack any legal standing in this context. Even some terms and conditions are not necessarily binding. You see those challenged all the time.
Opening the device to remove something loose, or to change the voltage versus "undertaking work on your own" are of course completely different things. So, to me, it is unclear what is and isn't allowed.
If there were a statement like "opening the device invalidates the warranty" it would settle my question, but there is nothing specified anywhere in the NS2. So my doubt remains.
If there is a seal of some kind (I had a laptop with such seal in the "additional ram" door; how idiotic is that? ) then we really risk losing the warranty when, let's say, switching the voltage, but otherwise how could anybody tell it has been opened?
By rule of thumb, I meant what manufacturers normally enforce. Of course, if you want to open your casing and then fight a legal battle about it, go ahead (And good luck, since it would be nice for the consumer to win for a change)...but it pays to caution people so that they do not blindly go and invalidate their warranties. I am sure that you can write directly to Nord to ask for clarification....if I have one tiny criticism of Nord, it is that their presence here on this board is haphazard, unlike Kurzweil's Dave Weiser, who will answer almost any question quickly on the Kurz's unofficial forums...and yes, Weiser has warned that you can invalidate the Kurz's warranty by doing things inside the chassis - and warranties are pretty standard from one company to another...
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Clavia probably states somewhere that maintenance is only to be performed by 'qualified service personnel'. What that means is up to them. Most likely that is the technical department of the distributor for your country (or some company the distributor uses for technical support).
Suppose there's something loose in your Nord and the shop you bought it opens it up to get whatever's in there out; there's a good (theoretical) chance your (factory) warranty is now invalidated. But since warranty in Europe is generally an agreement between the consumer and the shop they bought something that doesn't have to be an issue; the shop will need to honour (valid) warranty cases and if it turns out they need to pay extra because the (factory) waranty was invalidated (by their own action), that's not really a problem of the consumer. Of course, it usually works different in the real world and you might just end up paying (additionally) because of this.
I generally just assume that if I open up some device I've bought that I've lost all warranty I was entitled to.