Question about Cambridge Audio Azur 640A Amplifier

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Azur 640A right channel sound drops out intermittently

Often when turning the amp on, the sound from the right channel does not come through at all, but not always (i.e. sometimes the channel is fine when turning on). Switching between input sources usually solves this, sometimes just by switching once and then back, but mostly needing to switch multiple times back and forth before the sound comes through. It doesn't seem to matter which inputs you switch back and forth to get the sound back and also doesn't seem to matter if there are any active inputs on the input sources being switched to and back from.

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Posted on Jan 02, 2017

Grubhead
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SOURCE: Intermittent fault on right channel. Sound breaks

Get hold of a Servisol freezer spray, from either Maplin or Radio Shack, depending where you live. Take the top off and look inside. Locate the output transitors for the right channel and with it powered up wait for the fault to go away. Then with the spray, squirt any of the transistors you suspect. If it starts up (the fault) after the spray, that part has gone!
Do them one at a time and wait a while before spraying the next part. If you find one that acts up, to make certain, warm it back up by touching it with a soldering iron. Then freeze again.

Posted on Oct 07, 2009

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NAD C320. Only one channel sounds. Problem with the volume control?


Did you try to switch the loudspeakers? Before changing anything always lover the volume and switch off the amplifier.
Assuming you tested already different inputs, you can be sure no cable from signal source is out or defect. (or did you nit check that first?).
When the amp is switched off, disconnect the speakers and switch left to right and right to the left output.. If the other speaker is quiet now, you are sure it is in the amp. Still his can be anything.
You can check the connections between the pre and main amplifier on the back side. When you have an extra set of interlink cables, perhaps you can cross the in and output there too. Take care every time you change something, lower the voltage and switch off the amplifier. Sudden clicks when switching on or changing anything can damage the amp and or the speakers.

Perhaps when you checked this you can locate where the problem is? Speaker, speaker cable, power amp, pre amp, (only a part of the pre amp.

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An idication of a faulty headphone socket if the headphones being inseted cuts off the speakers. Otherwise a faulty switch that switches the speakers off.

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Sometimes you can find the faulty part by touching the parts inside the amp. Only touch the plastic parts not any metal parts! As it is on one channel you have a good channel to compare the bad. Often small transitors can become noisy so start with them!

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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

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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.

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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

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I have a sony xplod 1000 watt amp, Worked perfect for a month, All of a sudden my subs stop working, But the power light on the amp is always still on. every great while my subs will work again, sometimes...


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