Philiips cd230 - grounding of TCA0372 Laser/focus driver - diyAudio
Go Back   Home > Forums > Source & Line > Digital Source

Digital Source Digital Players and Recorders: CD , SACD , Tape, Memory Card, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 27th November 2003, 06:19 AM   #1
tbklbl is offline tbklbl  Singapore
diyAudio Member
 
Join Date: Apr 2003
Location: singapore
Default Philiips cd230 - grounding of TCA0372 Laser/focus driver

Recently acquired a philips cd230 player which is using Mitsubishi MN50423FP processor working with tda1543. What suprise me is that this processor should be using the japanese i2s format(tda1543a). Hav not listen to it thu cause the CDM4/19 and the tray gear is not working.

Anyway the problem is when tracing the ground path, found that the laser and focus op-amp driver takes the ground directly from the prcocessor. My plan was to take the driver ground and make a star connection via a ferrite bead(fb) to the full-wave rectifier. Is it the correct way to treat the ground via fb? Jean Paul??

The same +/- 12 or 15?? supplies was fed to the laser/focus driver and the analog cd demphasis opamp(LM833) as shown in this thread:
analog CD de-emphasis

My plan is to :
a)non-os for the tda1543 with separate 6V regulator
b) remove all the demphasis ccts
c) add LM317 as pre-regulator for the onboard lm7805
d) add k7 clock with separate regulator
e) change all the ecap. BTW what are the shell life for those polyester cap?

Is there any other suggestion? do u guys do any thing on the resonator for the u-controller?
  Reply With Quote
Old 27th November 2003, 09:07 AM   #2
Banned
 
Join Date: Dec 2001
Location: Zamboanga, City of Flowers, Mindanao
Send a message via Yahoo to Elso Kwak
Default Philips CD230

Hi tbklbl,
It does not surprise me the Japanese chip outputs Japanese format. So you have to use the TDA1543A.
In a cheap player like this supplies and ground are shared.
I would use the TDA1543A with the triple Darligton supply I posted here
http://www.diyaudio.com/forums/showt...882#post181882
and connect the KC-7 to the raw supply as it has its own regulators on board. I wouldn't use the ferrite bead as you suggested.
The resonator at the microprocessor does not influence the sound.
  Reply With Quote
Old 27th November 2003, 10:41 AM   #3
guido is offline guido  Netherlands
diyAudio Member
 
guido's Avatar
 
Join Date: Mar 2002
Location: diepe zuiden
Better check that Mitsu chip. If it is a decoder/filter in one, it could be impossible to go to non-os.

Greetings,

GuidoB
__________________
GuidoB
  Reply With Quote
Old 27th November 2003, 10:45 AM   #4
Banned
 
Join Date: Dec 2001
Location: Zamboanga, City of Flowers, Mindanao
Send a message via Yahoo to Elso Kwak
Quote:
Originally posted by guido
Better check that Mitsu chip. If it is a decoder/filter in one, it could be impossible to go to non-os.

Greetings,

GuidoB
Hi Guido,
Yes you are right, digital filter on chip! I overlooked that (so many questions).
  Reply With Quote
Old 27th November 2003, 12:46 PM   #5
diyAudio Member
 
martijn's Avatar
 
Join Date: Nov 2003
Location: nl
I know this circuit from the Philips cd604 & 614 (with remote),
but I haven't found a datasheet for this Mitsubishi chip.
Still,there are lots of 604's on the market........
Anyone out there with a datasheet?

Martijn
  Reply With Quote
Old 27th November 2003, 04:27 PM   #6
diyAudio Moderator Emeritus
 
jean-paul's Avatar
 
Join Date: Sep 2002
Location: Germany
Quote:
My plan was to take the driver ground and make a star connection via a ferrite bead(fb) to the full-wave rectifier. Is it the correct way to treat the ground via fb? Jean Paul??
Do so but leave the bead out. Beware that most circuits that use MN50423FP also make use of the internal oscillator. There is a possibility of connecting a low jitter clock instead of using the internal one. 8,4672 MHz is the one you'll need in most cases. I am looking at a Philips cdplayer now that's different from yours so please check frequency first.

In case you need the datasheet, I have it. I can mail it to you if you want it.
__________________
It's only audio. Official member of the Norske Brillegeit Gang.
  Reply With Quote
Old 28th November 2003, 12:46 AM   #7
tbklbl is offline tbklbl  Singapore
diyAudio Member
 
Join Date: Apr 2003
Location: singapore
>It does not surprise me the Japanese chip outputs Japanese format. So you have to use the TDA1543A.

That why it's suprised u see. It was original mounted with tda1543 instead of the japanese format.

>Do so but leave the bead out. Beware that most circuits that use MN50423FP also make use of the internal oscillator. There is a possibility of connecting a low jitter clock instead of using the internal one. 8,4672 MHz is the one you'll need in most cases

There was a 8.4672MHz crystal onboard. So i presume it used a external clk.

I had tried it on a AK601 with the same Mitsubishi chip. It can output a LRclk of 44.1kHz by changing the DASEL0-3 with different pull up/down, hence it meant non-os. The only thing that bother me is that it have 2 mode that operate LRClk @ 44.1kz. From the datasheet"
1) One of the them says bypass interpolation of uncorrectable data design for non-audio application such as CD-ROM or CD-I.

2) The other is digital filter pass mode with intepolation is used external precision digital filter applications"
  Reply With Quote
Old 1st December 2003, 12:50 AM   #8
diyAudio Member
 
martijn's Avatar
 
Join Date: Nov 2003
Location: nl
Default Mitsubishi & tda1543

Jean-Paul,

I found a Philips 604 and a 614 this weekend.
I'm itching to try the non os mod.
Would you mail me the sheet on it's decoder/filter from Mitsubishi?
Thanks a lot! Martijn
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Lions and Tigers and Grounding Problems, Oh My! DoZ Grounding... EchoWars Solid State 37 3rd August 2008 08:50 AM
LM3875 kit grounding, optimal grounding for separate amps and psu? findog Chip Amps 9 16th May 2005 09:27 PM
any cd60 schematic on PS, laser/focus drive & dac prtion? tbklbl Digital Source 2 28th November 2003 12:51 AM


New To Site? Need Help?

All times are GMT. The time now is 02:35 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2