Cambridge audio Dac 3 schematic needed

[lister40]

Hi,

The Dac is one of my designs, you need to replace the 8-Pin DIP 9637 - its located close to the input SPDIF's BNC's.

These are damaged when exposed to High Earth Leakage currents on the SPDIF inputs - never a problem when using BNC to BNC - but if you use BNC to RCA, then the center conductor of the RCA plug makes contact first - before the Ground - resulting in any Earth leakage current to flow via the center RCA pin to the input circuit.... With BNC connectors, you don't have this problem as Ground is always made first during connection, and broken last during disconnection.

John

What is a Dac 3 john.

 

[lister40]

What is a Dac 3 john.

It ok i got it now.newbe will ask lots of questions.cheers anyway

 

[Astuck]

Any news about the SM for DacMagic 1

Hi,
Old threads can't locate any valid service manual for the Cambridge Audio
Dacmagic 1...

Does someone have fresh news about it ?

Thanks.

 

[IanAS]

UA9637ACP

Thanks John and all,

I replaced that chip on my DACMagic2 and on a friends one.

:agree:

PS; And thanks for the explanation of the cause of the failure.

 

[Panku]

John Westlake designernt of Cambridge Audio I bought a D / A converter in the 90s. Besides, also the TRAC 1 CD player Cambridge Audio. The DAC 3 is broken. Nothing works. The voltage diodes from the transformers are not on the board either. I can't do anything because I don't have a schematic. I searched all over the world for Stereonet, diyAudio, Australia in my Polish magazines in a service in Poland, who called Great Britan to the producer and nothing. They said they didn't, in my opinion, it's not possible for the manufacturer not to have a schematic of the hardware they were making. Maybe you have a schematic for TRAC 1.
If you had or knew where I can buy such schematics, you would save the equipment and money for which I would have to buy another one, but the Cambridge Audio DAC 3 is no longer in stores. Thank you very much if you sent me, I would be very grateful. Paul