The NAP250 had the reservoir caps & logo replaced + DR channels fitted.
The NAC282 had tantalum & bipolar caps, logo replaced + the mod that we are discussing was applied.
I have seen a few examples of preamps where the RC5 input socket has been wired out of phase, this will hinder the operation big time. Unfortunately, you would need to remove the cover & upload a pic for me to check this. It is possible this wiring error could have slipped through the net while the 282 was at HQ.
Again, many thanks for your help root causing this problem. I really appreciate it.
Thanks for detail on what was done when the units were back at base - good news that the mod was applied when the 282 was serviced. I’ll see if I can pluck up the courage to remove the cover over the weekend . Watch this space…
Bingo!
Embarrassingly, the green and grey wires for the RC5 input are transposed at the PCB end - the green wire should be towards the rear of the chassis.
I think you have 3 options:
Return it to Naim with a slap on the wrist for an foc fix.
If you have a soldering iron, switch the wires round.
Make a lead as suggested above with one end transposed.
Please accept my apologies regarding this oversight.
Excellent - thanks for root causing the problem Neil. I’ll give the cable option a go first (thanks HiFiFoFum) - sounds the easiest. I’m not keen on poking around inside a £5K preamp with my soldering skills , and returning to Naim has a high hassle factor (although will do that if necessary).
Neil, I really cannot thank you enough for the help and advice you’ve given, and for ultimately diagnosing the issue. I’m inferring that you work for Naim, and this really is a level of service that is above and beyond. Just brilliant.
. Watch this space…
