A simple Marantz CD42/52/72 modification

SSassen · 17th February 2006, 06:17 PM

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.

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.

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

poynton · 17th February 2006, 06:44 PM

Hi,
What is the thing on the cd??

Andy

Cobra2 · 17th February 2006, 07:50 PM

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

Arne K

SSassen · 17th February 2006, 08:24 PM

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

poynton · 17th February 2006, 08:26 PM

I just hope it doesn't fly off when its going otherwise you'll be speaking in a high voice......

Bricolo · 19th February 2006, 12:39 PM

My CD62 looks totally different

SSassen · 19th February 2006, 01:10 PM

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

hobbitz · 12th January 2007, 07:21 AM

is that all you did as shown in the picture ? Just take out the chip and short the two pairs of holes ?

toscanob · 15th July 2007, 08:47 PM

Hi, have you the SM/Schematics of the CD42mk2? Thanks.

Predator864 · 1st March 2008, 08:52 PM

Well, I have the service manual.
And I need a little bump with this I2S. Cant figure them out.

17th February 2006, 06:17 PM	#1
SSassen diyAudio Member Join Date: Mar 2005 Location: Purmerend	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. 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. 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 __________________ Acception without proper examination equals religion Condemnation without proper examination equals prejudice

17th February 2006, 07:50 PM	#3
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	A trafo clamp ? - for that magic transformation...I guess... Arne K __________________ Ars longa, vita brevis

17th February 2006, 08:24 PM	#4
SSassen diyAudio Member Join Date: Mar 2005 Location: Purmerend	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 __________________ Acception without proper examination equals religion Condemnation without proper examination equals prejudice

17th February 2006, 08:26 PM	#5
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	.............ouch................ I just hope it doesn't fly off when its going otherwise you'll be speaking in a high voice......

19th February 2006, 12:39 PM	#6
Bricolo diyAudio Member Join Date: Nov 2002 Location: Grenoble, FR	My CD62 looks totally different __________________ Just remember: in theory there's no difference between theory and practice. But in practice it usually is quite a bit difference... Bob Pease


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17th February 2006, 06:44 PM	#2
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	Hi, What is the thing on the cd?? Andy

19th February 2006, 01:10 PM	#7
SSassen diyAudio Member Join Date: Mar 2005 Location: Purmerend	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 __________________ Acception without proper examination equals religion Condemnation without proper examination equals prejudice

12th January 2007, 07:21 AM	#8
hobbitz diyAudio Member Join Date: Jan 2007	is that all you did as shown in the picture ? Just take out the chip and short the two pairs of holes ?

15th July 2007, 08:47 PM	#9
toscanob diyAudio Member Join Date: Jun 2005 Location: Rio de Janeiro, Brazil	CD42mk2 Schematics Hi, have you the SM/Schematics of the CD42mk2? Thanks.

1st March 2008, 08:52 PM	#10
Predator864 diyAudio Member Join Date: Mar 2008	Well, I have the service manual. And I need a little bump with this I2S. Cant figure them out.

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