I blame Rush… Retrospective II was the CD I was trying to listen to.
I do not leave my 250 powered - but I do leave my HiCaps & XPS ‘on’. So I switched my 250 on, in the usual way today. The usual (for my CB era 250) power on ‘click’ happened - but was followed a second or so later by a power dowm ‘phut’…
Huh…? The Fuse…? That’s not happened (to me & my 250) for years… maybe decades…
Ah… Lets try. Fits new spare fuse. Click… Rush now playing.
Fuses do seem to get fatigued especially in things like big amps and power supplies. I used to leave everything on including 250 DR because of this. Plus some of the switches have also failed occasionally.
Yes XPS is terrible for blowing fuses, really is quite ridiculous at times, having to vacuum up tiny bits of fuse out of the back of the fuse holder wasn’t fun
None, just need to get to the back, then the fuse comes out in a similar manner to that of a 13amp plug fuse, ie just lever out the plastic tab carefully. Also if you have had the device from new, then you will find a spare fuse sitting in a dummy holder behind the main fuse.
IME, you may need a very sharp finger nail to prise open the carrier or a small bladed screwdriver (gently does it). Unless you have clear access to the rear of the kit, you’ll also need to de-stack it, especially if the fuse has shattered…and make sure the carrier is pushed fully back home.
For owners of much older Naim items, the fuse holder is a separate thing (near to, but separate from the IEC inlet - above the 240V label here) and needs to be unscrewed. Again, only this needs to be addressed.
Update. Its just blown its replacement fuse. Something is not right here. Further investigations are on going…
My replacement fuses are stock from a my Naim dealer from many years ago.
Fuse details -
RS Brand on glass
Markings on end cap - 250V T4 AL
My 250 is from 1985 and there is nothing on its rear panelt to indicate what the Fuse Rating should be (yes, I checkled). Its Instructions say 4 Amp Anti Surge for 240V.
1985 will be an H & F transformer, which will be 4A.
Try fuses from the Littelfuse 213 range.
It sounds like an inrush issue as a fault will blow the fuse all the time.