20 Most Recent NAD S300 Amplifier Questions & Answers

Hi, where did you get the new front?
Yours, Reemt Rentzsch

NAD S300... | Answered on Mar 29, 2013

Have someone who has experience working with circuit boards take it apart and look at it. They'll probably be able to tell you what parts can be replaced. If it's anything as simple as capacitors and resistors, then you can find the exact parts you need at AllElectronics.com

When they said it was a multilayer structure, that means either there are multiple circuit boards, or it's all surface-mount soldering on both sides of one board. To be on the safe side, assume it's surface mount. It's much more difficult to work on.

Hope that helps!

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/cameron_463100ffd54b591d

NAD S300... | Answered on Feb 13, 2011

You may have some dirt/corrosion on the input selectors or other controls. Get a good commercial contact cleaner and spray all the controls. This is best done inside with the cover off rather than trying to squirt through the front plate. If that does not help (or change the sound) then you may have a bad solid-state component (transistor or IC) that will require some help. If things change but don't resolve, then dirt is the issue and you may need multiple treatments.

NAD S300... | Answered on Nov 10, 2010

You have either got a bad earth connection, or possibily there's a capacitor failed.
If you can't find a dodgy conection, I would replace the large Electrolytic Capacitors in the power section, they are used to take out 50hz hum in the mains electric, when they go you get that hum coming into your system.

NAD S300... | Answered on Nov 18, 2009

Hi there, sounds like you may have a short to ground on the output transistors. Does it have transistors or an IC output. It is most likely that you have not replaced a mica washer or insulator. Check to ground with a meter from the case of the output devices.

NAD S300... | Answered on Feb 04, 2009

check your speaker wire or speaker, for short circuit.

NAD S300... | Answered on Jan 28, 2009

Yes you will need a pre-amp for your turntable, there is no phono input on this amplifier. Please update the question & let us know if the information given was useful to you - Good Luck!

NAD S300... | Answered on Sep 09, 2007

Check your connections to the plug there will be a little spark. repair it

NAD Audio... | Answered on Jun 20, 2020

Solved the recognition of DTS signal issue but the DTS options/settings in the menus are still not appearing - believe the previous owner may have upgraded the software. The solution for the DTS signal recognition was an output setting on the DVD (blu-ray) player - digital output vs analog.

NAD Audio... | Answered on Feb 21, 2020

This is the technical solution, you have to open the unit:
Locate IC33 and connect pin 6 to ground, connect power, and then remove the ground connection at pin 6.
The unit will then boot up in factory default.

Henrik Pedersen

NAD Audio... | Answered on Oct 29, 2019

Hi Michael, check inside your NAD C542, there are 4 fuses, check that none is open, if all are well, you could have problems with the capacitors in the area of the power supply or in the case of the Transformer
If you do not have technical capabilities to evaluate the above, consult a specialized technical service
I hope you can solve the problem
Greetings Franco Dosil

Hola Michael, revisa en el interior de tu NAD C542, hay 4 fusibles, controla que ninguno se encuentre abierto, si est?n todos bien, podr?as tener problemas con los capacitores del ?rea de la fuente de alimentaci?n o en el pero de los casos el Transformador
Si no tienes capacidades t?cnicas para evaluar lo previamente indicado, consulta un servicio t?cnico especializada
Espero puedas resolver el problema
Saludos Franco Dosil


NAD Audio... | Answered on Sep 16, 2019

Check the rectifier diodes in the power supply for shorts and look at all the filter capacitors in the power supply. Look for puffy discolored and domed tops. All filter capacitors must have flat tops. Check the windings of the transformer for darkened or burnt spots and test for shorts in both the primary and secondary windings

NAD Audio... | Answered on Jul 24, 2019

Hi aartman

Yes it does have backlamps.

They are soldered to the PCB so you will need a few tools like a soldering iron, philips screwdrivers, solder, and some replacement lamps. Replace the lamps with this type from Farnell electronics. They have a 15000 hr life expectancy and last alot longer in the unit. I have tried many types of lamps over the years, and found these are the best choice if you want them to last.


To get access to the lamps, you need to pull the main PCB out of the chassis to then get access to the bottom side of the printed circuit board where the 2 screws that retain the white lamp reflector assembly. Change both lamps with the type I mentioned,
6ab9edb.jpg Be careful not to flex the LCD display that is now exposed, it is quite fragile with the support of the lamp reflector cover no longer in place. ... reverse procedure to reassemble and away you go.

I am more than happy to talk about this solution with you further. Just ask away. Cheers


NAD Audio... | Answered on Jun 22, 2019

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