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My Nad 2400 wont power up the two fuses look ok?

Troubleshooting depends on what skills and tools you have. Since the fuses are located inside the amp, then I take it you're comfortable with removing the lid and poking around inside.

So, taking the usual mains power safety precautions....

Check that power from the wall socket is getting through to the amp. Use a multimeter to check the mains voltage as it comes in from the power cord. Also check the power is getting through the mains switch and on to the power supply board.

Disconnect the speakers and then power up the amp. If it comes on, then you've probably got either a cabling or speaker issue. Double check by trying the amp volume (no source, no speakers) and ramp it up slowly to 100%. If the amp still stays on then look at your speakers.

Connect one speaker, add a source of music. Power up and check the volume again but to about 1/3rd volume. If the amp cuts out then you found the bad speaker/wiring. If it ran okay then try with the second speaker attached. Repeat as before.

If the amp won't fore up with no speakers attached then something is either worn out or blown inside. Disconnect the live mains feed. Be careful of any capacitors. They will probably be holding charge.

Do a visual inspection. You're looking for capacitor bulge (Google it) or obvious signs of a diode, resistor or transistor having either blown or overheated.

Sep 18, 2014 | Amplifiers & Preamps

1 Answer

Stereo doesnt work when i tripped fuse

Check for voltage at the filter capacitors of the amp. These would be the two right after the rectifier bridge. It is possible the inductive spike created when the breaker tripped killed the bridge. You would see this as no DC voltage at the filter capacitors, but you would see AC from the main transformer.

Mar 28, 2012 | Technics Amplifiers & Preamps

1 Answer

My crown 602 xls tripped a breaker, I reset breaker regained power to receptacle , I lost power to the amp no led's come on front when i pushed the small reset button on the back I still did not regain...

They use a breaker instead of a fuse.


power to the amplifier.


• The amplifier's Power switch is off.

• The amplifier is not plugged into the power receptacle.

• The amplifier's high-voltage power supply circuit breaker has tripped. Verify that the AC mains

voltage is correct, then press the Circuit Breaker button on the back panel.

Take it to the ER.

Jan 12, 2011 | Crown XLS 602 2-Channel Amplifier

1 Answer

Dear repair team, I have a Mackie FR1400 power amp, about 12 years old and always been very reliable. On Saturday at a gig, it stopped working completely and blew the mains fuse and all the mains...

It wont be fixed by friday It appears a number of components have failed in the amp If it's not the main transformer , you're looking at $200-300 for a fix

Dec 06, 2010 | Mackie Amplifiers & Preamps

1 Answer

Hello. Can anyone repair my Nakamichi 730 receiver. There is no sign of power when switched on. I am in UK

Though we have a limitaton with our forum I can try and help in advicing you how to go about in finding a solution if within our reach. First of all disconnect the set and open teh panel screw and the top cover. Look inside for the fuse. If you have a continuity tester, loop from the power cord to the fuse to the main switch and to the transformer. If this circuit is correct the transformer must pwoer on and now connect your power to an outlet, Please be ccareful not to touch the a/c power circuit. Now put your multimeter inthe a/c range and check for the secondary voltage if absent, test if the transformer is faulty by a continuity test. If teh secondary voltage is ok, the change your range to DC and test the voltage coming out of the receive. trace the volatge to the control panels , processor and the outputs. If you are able to do this well then you may get an idea of the fault or if the fault is silly it could be around this section. If not I think you will need some help to go about to check the control panels . Hope I could help? Good day

Jun 10, 2010 | Amplifiers & Preamps

3 Answers

My bass guitar amp is blowing fuses

This sounds like the main rectifier diode/bridge is shorted. If you can rpovide the make and model, I may be able to give you more details.


Nov 25, 2008 | Amplifiers & Preamps

3 Answers

NAD 370

try to re-set mini circuit breaker inside.

Jan 21, 2008 | NAD C370 2-Channel Amplifier

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