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?
Maybe OPA2134 for the filters, 2937/2990 for the regs and a sprinkling of Blackgates migth help?
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). 🙁
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). 🙁
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.
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....
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....
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!
I may try OP249 or AD8620. But I will make sure I can revert to the original configuration in case it sounds worse. Thanks!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
http://www.diyaudio.com/forums/showthread.php?s=&threadid=113320
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 4700µF 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 ?
I have just started a new thread below though this one discusses mods you guys may be able to help
http://www.diyaudio.com/forums/showthread.php?s=&threadid=113320
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 4700µF 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 ?
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.
I saw another owner elsewhere talking about the same problem. There is a 2200 ohm resistor that burns open leaving the mute relay closed or open preventing the audio signal from reaching the RCA out jacks. It should be replaced with a 1/2 Watt or higher part.