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Old 25th August 2006, 05:43 AM   #1
wineds is offline wineds  Australia
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Default Cambridge Audio 640C V2

I have one of these CD players and I am very happy with it. Or at least I was unitl I pulled the lid off it last weekend. It is beautifully built inside with copper colored covers on the torriod and servo. The main PCB does contain a lot of average parts though - NE5532 for the filters (x6), 7815/7915 regs and cheap looking NP electo caps and filter caps in the PS. Seems like a lot of upgrade potential here. Anyone tried upgrading one yet?

Maybe OPA2134 for the filters, 2937/2990 for the regs and a sprinkling of Blackgates migth help?
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Old 25th August 2006, 05:52 AM   #2
johndiy is offline johndiy  Greece
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id change the caps only because i have no experience at mod

go for it

john
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Old 25th August 2006, 06:15 AM   #3
wineds is offline wineds  Australia
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pic of inside...
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File Type: jpg ca840v2.jpg (94.1 KB, 744 views)
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Old 25th August 2006, 11:07 AM   #4
adinica is offline adinica  Romania
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Hi!
Unfortunatelly, the power trafo it`s not a toroid, it`s actually an el-core type. If you are happy with the sound, by changing some of the components like op-amps and capacitors, the new sound may become unpleasant for you.
It`s my case with my Marantz cd67se (modded with opa2134 and Nippon-Chemicon caps).
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Old 25th August 2006, 11:12 AM   #5
Salas is offline Salas  Greece
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Use OP275 for Marantz. They match.
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Old 26th August 2006, 12:03 AM   #6
wineds is offline wineds  Australia
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Adinica - If I remove the NE5532s, I will replace them with sockets so I can try many different opamps like OPA627 maybe. Also, I can revert to NE5532 if things soudn worse.
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Old 26th August 2006, 09:00 AM   #7
tubenut is offline tubenut  South Africa
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careful now... 5532 is dual, 627 single.
I would imagine the cambridge stuff to be voiced and designed so do one thing at a time so you can go back. Not all technically better bits sound better in all applications....
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Old 27th August 2006, 08:18 AM   #8
wineds is offline wineds  Australia
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Thanks Tubenut. You are right, OPA627 is a single I may try OP249 or AD8620. But I will make sure I can revert to the original configuration in case it sounds worse. Thanks!
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Old 9th December 2007, 03:35 PM   #9
Kajman is offline Kajman  United Kingdom
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I am desperately trying to repair my cambridge audio 640 V2 CD player.

I have just started a new thread below though this one discusses mods you guys may be able to help

Cambridge Audio 640C No audio output PLEASE HELP!


The player powers on, reads CDs and is doing all its supposed to do apart from not delivering any output on the analogue output.
I can only assume the fault is with DAC board as the transport seems fine even with the DAC bard removed.

The DAC has 9 regulators 7x 7805CV with a 7815CV/7915CV pair which got very hot (before the fault ) All these reglators do not have any heatsinks and I feel will fail with time in these units. I have replaced all these and can now hear the output relay (mute??) click on power on and switching tracks which it had stopped doing when the audio went BUT I still have no audio output.
I have now replaced most capacitors apart from the 2 big smothing caps 4700F and 6 Non polars which I do not have but still no joy.

There are 4 small transistors by the relay 2 each of S8050 and C9012 which seem hard to source not that I am sure they need replacing. I would rather replace a couple of items in one go rather than removing and testing 1 at a time especially with cheap parts which cambridge audio have used.

Any suggestions ?
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Old 27th January 2014, 07:45 PM   #10
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I know this an old thread but.....if you are having this 'no output' problem, or even if just want to improve this player, do the lampizator 'snip it' mod, a little reduced output level for a big improvement in sound quality...highly recommended.
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