Question about Cambridge Audio Azur 640A Amplifier

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Problem with azur 640a amp

Amp cuts out at random regardless of volume, 'protection' red led flashes and i have to unplug from mains to reset this has been happening ever since i bought it but recently it wont reset every time sometimes have to leave unplugged overnight......any ideas????

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Protection mode activated to protect your amp from a problem.
please disconnect all your speaker from the amp and check if it is fine start to connect your speaker one by one until you find the bad one which make the problem-change its cable first and then speaker itself.if the problem still you will have a problem in amp.

Posted on Jul 13, 2008

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Running four S70 Siroccos off the amp, everytime volume gets halfway the protection is cutting in with protection light flashing three times? When reducing down to two speakers amp cuts out three quarters...


You are overloading your amp. IMO 640A cannot handle heavy loads.

Better change the speaker combo and connect something that puts right load on the 640A. Else, get a meaty amp from CA.

Mar 04, 2011 | Cambridge Audio Azur 640A Amplifier

1 Answer

HI, Can the Cambridge Audio 640a integrated amp be used as a preamp if I buy a separate power amp.


Of course, just run an audio RCA pair out from the Pre Out to your next amp and any input. All control for volume, tone, etc will remain with the 640A.

Jan 26, 2011 | Cambridge Audio Azur 640A Amplifier

1 Answer

I have a Cambridge Azur 640A amp, every time I turn the volume up to over 12 oclock the amp shuts down. Can this be changed? I presume this is a safety mode on the amp. Can you help?


Yes, you are right. That's a protection feature to prevent burnouts. Typically it appears when your speakers are sucking up a lot of load from the amp. Please check your speaker impedance and the amps' output impedance and ensure the wiring are properly done. Some amps are soo sensitive that they may cut-off after certain level due to overload.

Jan 06, 2011 | Cambridge Audio Azur 640A Amplifier

1 Answer

Red light flashes - will not work - could it be dust in the amp?


hi,
its not because of dust. AZUR 640A offers loudspeaker protection if the output of the amplifier goes to a high constant voltage (DC) because of some internal fault. This is a rare fault although detecting it could just save those expensive loudspeakers.
Due to the necessary sensitivity of the DC protection circuit, hard clipping of the amplifier may cause DC protection to be triggered. If this fault occurs switch the unit off, power up again and check
operation with a reduced volume level. If the DC fault occurs again contact your dealer for service.
ok

Dec 29, 2010 | Cambridge Audio Azur 640A Amplifier

1 Answer

Cambridge azur amp 640a working brill till yesterday !! now protection light !!!! turned it off numerous time etc plenty of venterlation carnt get it to work


Looks like the fuse blown.. or the classic symptom of electrical fault inside the amp. 640A uses a sensitive protection circuit often ends up in this irritating situation. Normally, there is nothing much you can do, but just check your wall plug connection for Open Ground or Left & Neutral reversed issues. If the wall plug is free of error, then you should better contact CA technical support.

Dec 08, 2010 | Cambridge Audio Azur 640A Amplifier

1 Answer

Hello, I am trying to plug my Mixer into my amp but only one speaker has sound..I am using a Rane ttm57sl mixer with technics turntables & cambridge audio azur 640a amp...I've gone from the Aux out on...


Why don't you try using the main outputs (the 2 XLR connectors). With 2 cables connect these two (left - right) outputs at your amplifier's aux in. In that case take care that the "output level" of the mixer works like master volume controlfor the signal that the mixer sends to the amplifier.

In case of a problem or clarification, don't hesitate to post.

Thanks and regards
Please kindly rate this solution
Stelios

Feb 04, 2010 | Cambridge Audio Azur 640A Amplifier

1 Answer

I have cambridge audio azur 640a amp. Problem I have is only the one speaker is working. Both speakers seem to be ok working off the left speaker terminal. Seems to be problem with output from right...


The fault is on the amp! It sounds like the protection circuit is detecting a surge on the channel and shuts it down to protect the speaker. I would check the semiconductor device(s) for the right channel on the heatsink of the amp. You might even see damage of burning on one!

Dec 29, 2009 | Cambridge Audio Azur 640A Amplifier

2 Answers

My azur 540a/640a v2.0 amplifier is not working.


Loud buzzing normally means dc on output or through your spaeker,amplifier needs to be serviced as it is faulty

Dec 25, 2008 | Cambridge Audio Azur 540A Amplifier

1 Answer

Protection mode overuse


Flashing protection LED indicates there is problem with circuit. Have unit serviced

May 10, 2008 | Cambridge Audio Azur 640A Amplifier

1 Answer

Protection snaps into action intermittently


I don't think the pin or third prong on your power cord would be the problem, but I would make sure that all of your speaker wires and connections going to your amp are not shorting out against eachother.


I hope this helps you out.

Apr 01, 2008 | Cambridge Audio Azur 640A Amplifier

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