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Old 14th January 2013, 03:59 AM   #21
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Join Date: Jan 2013
Originally Posted by JohnW View Post

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.

What is a Dac 3 john.
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Old 19th January 2013, 02:38 AM   #22
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Originally Posted by lister40 View Post
What is a Dac 3 john.
It ok i got it now.newbe will ask lots of questions.cheers anyway
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Old 4th August 2014, 03:43 PM   #23
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Join Date: Nov 2010
Default Any news about the SM for DacMagic 1

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

Does someone have fresh news about it ?

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Old 27th February 2016, 12:27 PM   #24
IanAS is offline IanAS  England
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Join Date: Dec 2004
Location: London
Default UA9637ACP

Thanks John and all,

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


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

Last edited by IanAS; 27th February 2016 at 12:30 PM.
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