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
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
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
Best regards,
Sander Sassen
http://www.hardwareanalysis.com
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
Best regards,
Sander Sassen
http://www.hardwareanalysis.com
SSassen said:
Hi, Could you describe your pin to pin connection from saa7310 to saa7350?
The I2S from saa7310 pin1~pin4 go to PCF2705 pin1~pin4 then to the
shifting circuit ,did you also remove the shifting circuit? Or you let the saa7350 take the signal from shifting circuit (originally for sm5840)?
Thanks!
Predator864 said:
It's really helpful, thaks.
Indeed I'm modding a Philips CD-950, the SMD SM5840 seems hard to removed clearly (without some tools). But it's easy to bypass the mess betwee saa7310 and saa7350 ,since the CD-950 reserved some pin position on the board. The I2S from saa7350 (on CD950) was divided into two ways directly, one way to the PCF2705, oneway to the mess of SM5840, I'm just wondering if I can just cut the way to SM5840(also cut the connecting resistors from SM5840 to saa7350), then fly some wires from PCF2705 to saa7350 .
PS. I'm also wondering how many chips could one saa7310 connected to directly (without buffer or...), ex. for my CD950, it was connected to two chips (SM5840 and pcf2705) , any possibility to load more chips on the same one saa7310 I2S output (EX. one more NOS tda1541?)?
"SMD SM5840 seems hard to remove"
http://www.diyaudio.com/forums/showthread.php?s=&threadid=127924
http://www.diyaudio.com/forums/showthread.php?s=&threadid=127924
All done, enjoying now. Thanks a lot, guys.
My way below:
1.ground saa7350 ID1~ID3.
2.disconnect saa7350 pin 7~10 from sm5840. (on CD950 these are 4 green bridging resistors on same side with pcf3523)
3.connect saa7350 pin8 to pcf3523 pin3(saa7310 pin2), saa7350 pin9 to pcf3523 pin1(saa7310 pin4),saa7350 pin10 to pcf3523 pin2(saa7310 pin3).
4.done, time for music.
My way below:
1.ground saa7350 ID1~ID3.
2.disconnect saa7350 pin 7~10 from sm5840. (on CD950 these are 4 green bridging resistors on same side with pcf3523)
3.connect saa7350 pin8 to pcf3523 pin3(saa7310 pin2), saa7350 pin9 to pcf3523 pin1(saa7310 pin4),saa7350 pin10 to pcf3523 pin2(saa7310 pin3).
4.done, time for music.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.