Question about NAD L73 DVD Player
I have humming problem with my NAD L73. It started suddenly some months ago. The unit is 3 years now. Very strong humming when the unit is powered up cold and then gradually fades, but it never disappears completely. The humming level can vary from time to time without any changes in the setup or the system. I have tried eliminating all external sources of humming but my conclusion is that it is something inside the L73 that is not allright.
If humming disappears after the unit "warms up", then it is usually a defective component in the internal circuits. Components are used to stabilize the signal in different parts of the circuit, capacitors store charge, ICs and transistors amplify or stabilize voltage. Some of them have an active role only when circuit is 'cold' (capacitors are still charging up). A psu that is starting to fail because of a defective capacitor, a faulty preamp, or a defective amp final IC may result in a humming noise that disappears when the unit 'warms up'. If the problem is a defective component you usually get the fault worsening in time, until the unit is not starting anymore.
Before sending the unit for repair, check home network voltage and grounding, or test the NAD L73 somewhere else.
Connect the NAD L73 directly to the wall socket. Power draw from other appliances connected to a multi-socket extension, or grounding problems can result in humming.
Test using different cables and devices. Use a minimal set of connected cables when testing.
Check speakers or audio wiring and check the speakers.
If all this does not fix the problem, then the L73 must be repaired. In that case contact NAD Electronics.
Posted on Dec 29, 2010
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Posted on Jan 02, 2017
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