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A simple Marantz CD42/52/72 modification
A simple Marantz CD42/52/72 modification
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Old 17th February 2006, 07:17 PM   #1
SSassen is offline SSassen  Netherlands
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Default A simple Marantz CD42/52/72 modification

I've owned a Marantz CD42 MKII for about 12-years now and recently purchased a new Marantz the CD 7300. Although I've modified the CD42 MKII soon after I purchased it all those years ago I felt uneasy to render it into a hobby project after all those years of faithful service. Hence I went looking for a 2nd one, and soon found it for a mere 30-euros off of the Dutch equivalent of Ebay. So now I'm sitting here with this CD-player begged to be taken apart and explored further.

Click the image to open in full size.

Upon closer inspection I noticed Marantz opted to use the NPC SM5840 digital filter to upsample the raw 16-bit/44.1KHz I2S data from the SAA7310GP to 20-bit/8-Fs. Strange, considering the fact that the SAA7350 DA-convertor used is perfectly capable of accepting the raw 16-bit/44.1KHz I2S data and upsample it to 256x or 384x Fs.

Click the image to open in full size.

Hence I simply took the NPC SM5840 out and routed all I2S signals to the SAA7350 directly and set it up to accept I2S format signals. Since I was holding the soldering iron already I also decided to implement a master-clock, using the buffered clock-output of the SAA7350 and connected the SAA7310 to this clock as well.

The result of this simple exercise is a CD-player which has almost been given a new lease on life. The soundstage is now more coherent and voices and instruments can now more easily be pinpointed in the stereo image created. So if you happen to have such a CD-player lurking about, you could give this a try, I'm sure you won't be dissapointed.

Best regards,

Sander Sassen
http://www.hardwareanalysis.com
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Old 17th February 2006, 07:44 PM   #2
poynton is offline poynton  United Kingdom
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Hi,
What is the thing on the cd??

Andy
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Old 17th February 2006, 08:50 PM   #3
Cobra2 is offline Cobra2  Norway
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A simple Marantz CD42/52/72 modification A simple Marantz CD42/52/72 modification
Default A trafo clamp ?

- for that magic transformation...I guess...

Arne K
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Old 17th February 2006, 09:24 PM   #4
SSassen is offline SSassen  Netherlands
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Those are metal discs meant to keep the CD on the pickup, else it would just not stay on there when the drive motor spins up. You might recognize them as they're normally used to mount torodial transformers. I used them so I could test that the CD-player was still functioning correctly prior to putting all the bits and pieces back into the chassis.

Best regards,

Sander Sassen
http://www.hardwareanalysis.com
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Old 17th February 2006, 09:26 PM   #5
poynton is offline poynton  United Kingdom
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Default .............ouch................

I just hope it doesn't fly off when its going otherwise you'll be speaking in a high voice......
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Old 19th February 2006, 01:39 PM   #6
Bricolo is offline Bricolo  France
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My CD62 looks totally different
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Old 19th February 2006, 02:10 PM   #7
SSassen is offline SSassen  Netherlands
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That's not surprising because it is not in the same series, only the CD42/52/72 are, as I mentioned in the initial post.

Best regards,

Sander Sassen
http://www.hardwareanalysis.com
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Old 12th January 2007, 08:21 AM   #8
hobbitz is offline hobbitz  Thailand
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is that all you did as shown in the picture ? Just take out the chip and short the two pairs of holes ?
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Old 15th July 2007, 09:47 PM   #9
toscanob is offline toscanob  Brazil
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Default CD42mk2 Schematics

Hi, have you the SM/Schematics of the CD42mk2? Thanks.
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Old 1st March 2008, 09:52 PM   #10
Predator864 is offline Predator864  Europe
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Well, I have the service manual.
And I need a little bump with this I2S. Cant figure them out.
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