20 Most Recent Cambridge Audio Azur 540A Amplifier Questions & Answers


Open your amplifier then find the power relay inside push the power button and observed the relay if active. If so the measure the voltage on large capacitors. But if the relay is not active check the relay drive transistor and the blocking diode across the coil.

Cambridge Audio... | Answered on Oct 31, 2014


Check the speaker wires for a short. Try operating the amp without the speaker wires hooked up.

Cambridge Audio... | Answered on Oct 06, 2014


The that you're pushing is only local control switch same as remote control. So the main power is controlled by a relay inside the amplifier find that and using your remote control power it on observed the reaction if the relay is activated the measure the voltage if it going through the large capacitor. I hope this may help you.

Cambridge Audio... | Answered on Oct 27, 2013


Protection circuits respond to overloads. Unless the protection circuit is faulty there is probably something wrong with the power amp parts located on the heat sink.
It would be a good idea to have the top cover off (on power) and listen for that noise to try and pin it down what is making it.

Cambridge Audio... | Answered on Aug 25, 2013


yes,pls.stop plugging the system,you may harm your system if you do so,the system has it's own system analysis mode,and if there's something wrong in the circuitry,it will activate,you need the authorize service center my friend,it's a technical problem.

Cambridge Audio... | Answered on Sep 27, 2012


I've never repaired one of these but I have an amp at home that makes a intermittent static "popping" noise that i'm going to put down to a dirty volume pot (control) that needs cleaning. I will also have to change some of the electro capacitors that have dried up inside which cause "shot noise". With the right lubricant (electrical contact cleaner, nothing else) you could take to lid off and spray a small 1 second blast into the hole of the pot and any other balance or tone control yourself but I would take it to the electronics repairer to get the capacitors checked over.
My theory only
Good Luck!

Cambridge Audio... | Answered on Jul 12, 2011


Normally this means that the power supply or the load is incorrect.
Have you very low impedance speakers ?
Have you tried disconnecting speakers from amp and powering it on.
If it does and you do not get any protection light you need to investigate your speakers.


Cambridge Audio... | Answered on Feb 12, 2011


This is a common question on this site. Amps of all types have protection circuits to keep them from doing a self meltdown. Testing follows this logic. 1. Remove all speaker wires. 2. Keep the volume down - all the way. 3. Turn the unit on. 4. If it does not trip off, then there is a problem either in a speaker or the wiring. a. Reconnect one at a time until/unless it trips off b. That will tell you where to look further.
If it does trip off, then there is an internal circuit issue in the amp and probably requires professional help to fix.

Cambridge Audio... | Answered on Dec 28, 2010


If the noise does not go away when you turn the volume control down the problem is in the output stage. If the noise is in one channel, then you should only look at that channel. Use the other good channel as a guide to what is working. If in both channels then it can only be something common to both channels. The bad news is that anything can cause noise.

Cambridge Audio... | Answered on Nov 09, 2010

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