As an authorized NAD servicer for over 40 years this is the first time I’ve heard of this.
I can’t see how this would occur UNLESS the user keeps their electronics on all of the time.
The user did not mention they were listening the time it failed, so I guess they do keep it on at all times. In standby, the capacitor that failed is not in the circuit.
If powered to a fully on condition, the capacitor is live and before any regulation. If there are issues with incoming AC power they will translate thru to these 4 capacitors.
If the user does not keep the unit on at all times this can still occur, but it’s less of an issue.
Capacitors can and do fail due to many reasons but there is nothing endemic in this model.
If the incoming AC power is above the nominal voltage (typ. 114-126) for long periods of time, this can put a stress on filter caps in pre-regulated circuits.
Here is a good suggestion for all electronics... do not place anything combustible above the equipment and the "burning" component will not have anything to ignite.
I do agree with the poster directly above this as the highly corrosive electrolyte is likely spewed onto many parts and the PC board, too. It will cause metal component leads as well as. PCB traces to corrode and fail. Also, the unit uses double sided PC boards and many small "plate-throughs" (micro rivets that connect one side of the board to the other) that are easily damaged from the electrolyte.
I can’t see how this would occur UNLESS the user keeps their electronics on all of the time.
The user did not mention they were listening the time it failed, so I guess they do keep it on at all times. In standby, the capacitor that failed is not in the circuit.
If powered to a fully on condition, the capacitor is live and before any regulation. If there are issues with incoming AC power they will translate thru to these 4 capacitors.
If the user does not keep the unit on at all times this can still occur, but it’s less of an issue.
Capacitors can and do fail due to many reasons but there is nothing endemic in this model.
If the incoming AC power is above the nominal voltage (typ. 114-126) for long periods of time, this can put a stress on filter caps in pre-regulated circuits.
Here is a good suggestion for all electronics... do not place anything combustible above the equipment and the "burning" component will not have anything to ignite.
I do agree with the poster directly above this as the highly corrosive electrolyte is likely spewed onto many parts and the PC board, too. It will cause metal component leads as well as. PCB traces to corrode and fail. Also, the unit uses double sided PC boards and many small "plate-throughs" (micro rivets that connect one side of the board to the other) that are easily damaged from the electrolyte.