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Old 16th December 2012, 07:18 PM   #18921
6h5c is offline 6h5c  Netherlands
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Now that you mention it, the decoder could very well be the culprit. I believe I read something in the past about it's CRIN/CROUT pins specifically being designed for use with a crystal. That's probably why Marantz had to go through all the trouble of adding those extra R/C at the pins to make it work with the external signal. Maybe the rise/fall times are just too steep and the RC network tunes this down a bit. I only clocked the CD67 decoder directly, and I assumed I would work like that with a 63 as well...

Ray
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Old 17th December 2012, 09:41 PM   #18922
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Quote:
Originally Posted by 6h5c View Post
All those low-noise regulators will not help against the high-frequency square wave that is output by the DAC itself... it's the nature of the beast, so to speak.

The analog filter is needed to create a sinewave shaped signal out of this pulse-width modulated output, because it's nowhere near analog. If you bypass the filter, all kinds of higher-order harmonics will enter the system and this will create all sorts of distortion and intermodulation products. Not good...
But, depending on the system, you may or may not hear the negative side-effects of this.


Good luck with The Flea's

Ray


regarding the 5 MHz in the output of the DAC, I am thinking to use a transformr with very separated primary and secondary in order to completelly eliminate the 5 MHz and leave only the audio in the pWM signal. Does someone foresee a problem with this aproach?
thanks
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Old 18th December 2012, 05:09 PM   #18923
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Originally Posted by FLAVIO MARINS View Post
regarding the 5 MHz in the output of the DAC, I am thinking to use a transformr with very separated primary and secondary in order to completelly eliminate the 5 MHz and leave only the audio in the pWM signal. Does someone foresee a problem with this aproach?
thanks
5 MHz in the output of the DAC
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Old 18th December 2012, 07:18 PM   #18924
6h5c is offline 6h5c  Netherlands
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No, that shouldn't be a problem. The transformer acts as a low-pass filter due to the nature of inductance (impedance rises with frequency...) so the audio-signal will pass without problems and most of the the HF noise will be blocked. The transformer will also do the summing of the symmetrical outputs. Here's an example:
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Old 20th December 2012, 08:21 AM   #18925
Pocoyo is offline Pocoyo  Indonesia
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Originally Posted by UV101 View Post
R124 and 125 form a potential divider from the 5v rail near the servo to create a 2.5v vref. If the values are incorrect the vref will be wrong.
What voltage are you getting at the junction of the 2 resistors? Without the vref, you will have no radial, focus or laser
Now the CD start spinning ... Horeee

R 124 and R 125 value was 2.49volt and 2.49 volt
Looks like i must desolder some caps beside HDAM
i tried AD823AN but the sound look so aggressive.
than come back to original, next i will try LM6172IN
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Old 20th December 2012, 11:16 AM   #18926
FritzS is offline FritzS  Austria
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Originally Posted by Pocoyo View Post
Now the CD start spinning ... Horeee

R 124 and R 125 value was 2.49volt and 2.49 volt
Looks like i must desolder some caps beside HDAM
i tried AD823AN but the sound look so aggressive.
than come back to original, next i will try LM6172IN
Give OP275 or LM4562 (LME49720HA) a chance
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Old 20th December 2012, 11:06 PM   #18927
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During the process of modding my 2nd CD63 I accidentally blew up Q106 (Dual opamp TCA0372). Actually there was an minor explosion blowing off the top of the IC leave big hole behind !!! I could also see sparks
This happened after I changed some of the caps and I suspected that there was a short circuit somewhere caused by the remains of either the left over solders or the copper wire legs of the caps leaving behind on the PCB.
Luckily when I switched on the player it could start up but only could not read any CD. The drawers could open and close. I hope it will work again when I change the damaged IC. I have just ordered one from the Bay for about 5.
In future I will ensure the inside of the PCB are clear before switching on the power.
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Old 21st December 2012, 02:23 PM   #18928
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The data sheet says max voltage for the TCA0372 is 40V so you must have fed it a negative voltage before it blew. Make sure you correct the fault before installing the new chip.
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Old 22nd December 2012, 03:03 PM   #18929
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Hi All,
My CD53 door wheel teeth are broken. Can anyone please suggest a good door eject wheel?

Thanks
Badri
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Old 22nd December 2012, 10:17 PM   #18930
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Hi all,
modded a few 63s just purchased a 67 from fleabay to have a play see whats on offer, only cheap 10 anyone any good mods apart from the usuall suspects?.
cheers guys alan
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Last edited by bikeral10; 22nd December 2012 at 10:22 PM. Reason: mispelling
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