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Hi, I need to change a fuse in my Cambridge Audio Amplifier 640A - What tools do I need to open the case? I'm sure I did this once a few years ago ...

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It looks to me that top comes off by the means of four posiedrive screws located on the rear panel two on either side.
There are several youtube videos on this amp repair.

Posted on Jan 01, 2017

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Posted on Jan 02, 2017

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Cambridge audio 640a problem, olume goes to zero, I hear a little bang on speakers, light starts blinking!


This sounds like there's an overload in the main amp section. Often caused by a short-circuited device.

Oct 06, 2014 | Cambridge Audio Azur 640A Amplifier

1 Answer

I cannot open my cambridge audio 640A compact disc


This is a common issue with all belt-drive cd players, all you have to do is to change that belt and you should be done, or take it to a shop for servicing, as this is a part of a simple service maintenance routine, cheap fix though.

Nov 02, 2013 | Cambridge Audio Azur 640A Amplifier

1 Answer

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

Hi, I have only used my CA 740C a few times and the fuse blows, I placed another fuse in and that blew as well. Haven't a clue why this might be happening can you help please? Thanks


Looks like a electrical problem. Ensure your plug's earth is properly connected to the building earth. Amps like 640A uses sensitive circuits and the fuse will definitely blow, when there are issues, spikes or returns in the power supply.

Try shifting the amp to a different wall plug with some proper ground earth, and check it. If the fuse still blows, then the power cable in the amp may have some problems.

Hope this helps :-)

Jan 04, 2011 | 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

230 Voltage


Good Day sir, yes the 640a has a voltage selector switch.
http://www.cambridgeaudio.com/support_products.php?PID=105&Title=Support
Hope this may help.f3aab94.jpg

Jul 21, 2009 | Cambridge Audio Azur 640A Amplifier

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