Marantz CD63 & CD67 mods list - Page 1912 - diyAudio
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Old 20th March 2013, 01:19 PM   #19111
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Quote:
Originally Posted by dwjames View Post
Actually, now I follow that all through with a fresh head, something there doesn't make sense...
Where you have shown a new +5v to the place where the R511 is removed, shouldn't it be to the other hole left by the R511? Otherwise with the R511 removed, there's no path to the + of the C509, C510 and pin 11 of the decoder?
You may wish to check the copper straps in the PCB and I think you may retain the resistor or remove it. The resistor is for protection the supply circuit.
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Old 20th March 2013, 01:35 PM   #19112
dwjames is offline dwjames  England
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Originally Posted by higlander View Post
You may wish to check the copper straps in the PCB and I think you may retain the resistor or remove it. The resistor is for protection the supply circuit.
All I mean is, shouldn't the new 5v where R511 is removed go to this green point instead?
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Old 20th March 2013, 03:25 PM   #19113
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Originally Posted by dwjames View Post
All I mean is, shouldn't the new 5v where R511 is removed go to this green point instead?
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Yes, you are right. You should connect the +5V to the green point if you want to bypass the R511 resistor. Alternative you can lift one of the the legs of R511 (the leg on the left hand side) and connect the +5V to it. This serves as a protection to limit the current in case of a short circuit. Sorry for the confusion.

Last edited by higlander; 20th March 2013 at 03:32 PM.
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Old 20th March 2013, 03:29 PM   #19114
dwjames is offline dwjames  England
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Originally Posted by higlander View Post
Yes, you are right. You should connect the +5V to the green point if you want to bypass the R511 resistor. Alternative you can lift one of the the legs of R511 and connect the +5V to it. This serves as a protection to limit the current in case of a short circuit. Sorry for the confusion.
no trouble. that's great. Thanks
Do you happen to know how many mA the digital and analog sections of the decoder use on their 5v feeds?
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Old 20th March 2013, 03:40 PM   #19115
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Originally Posted by dwjames View Post
no trouble. that's great. Thanks
Do you happen to know how many mA the digital and analog sections of the decoder use on their 5v feeds?
I think the current drawn from individual ICs of the DAC, the Decoder and the Servo IC should be less than 200mA as I constructed my low noise voltage regulator using LT17635 which has a max. output of 500mA only.
You may look at thread number 19021 and 19029 to see what I had done with the LT17635 regulators which is located on top of the display control chip.
Marantz CD63 & CD67 mods list

Last edited by higlander; 20th March 2013 at 03:48 PM.
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Old 20th March 2013, 04:05 PM   #19116
dwjames is offline dwjames  England
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Originally Posted by higlander View Post
I think the current drawn from individual ICs of the DAC, the Decoder and the Servo IC should be less than 200mA as I constructed my low noise voltage regulator using LT17635 which has a max. output of 500mA only.
You may look at thread number 19021 and 19029 to see what I had done with the LT17635 regulators which is located on top of the display control chip.
Marantz CD63 & CD67 mods list
ooooh, nice
That's some good, neat work and some mods a good few steps above what I'm hoping to achieve.
Do you have a closeup pic of that new regulator board above the display chip?
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Old 20th March 2013, 04:41 PM   #19117
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Originally Posted by dwjames View Post
ooooh, nice
That's some good, neat work and some mods a good few steps above what I'm hoping to achieve.
Do you have a closeup pic of that new regulator board above the display chip?
Well, I did not invent this and I just made the regulator according to this (see thread number 18456):
Marantz CD63 & CD67 mods list
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Old 20th March 2013, 04:46 PM   #19118
dwjames is offline dwjames  England
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Originally Posted by higlander View Post
Well, I did not invent this and I just made the regulator according to this (see thread number 18456):
Marantz CD63 & CD67 mods list
Nice, thanks
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Old 21st March 2013, 08:28 AM   #19119
Bartt is offline Bartt  Netherlands
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Originally Posted by higlander View Post
If you want to have tighter bass I suggest you give the servo with a steady power supply by using a 50VA 2X12V toroidal Tx.
I'm a bit of a noob How do I build a powersupply with this tx thats any good? I guess I'll be needing some caps too Do you have schematics of how to build one?

Do I use them for all 3 chips (servo drivers and motor?)
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Old 21st March 2013, 03:17 PM   #19120
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I'm a bit of a noob How do I build a powersupply with this tx thats any good? I guess I'll be needing some caps too Do you have schematics of how to build one?

Do I use them for all 3 chips (servo drivers and motor?)
What you need to do is to buy a 50VA 2X12V toroidal transformer. Now look at the circuit diagram of the CD63. Disconnect the stock transformer's secondary winding from U308(12V), U309(earth) and U310(12V) and replace them by the 50VA Tx. You should also change C813 to a bigger cap. say 10000UF to 22000uF. For C814 change it with a 6800uF or 10000uF cap.

You may wish to see the photo in my thread 19085 for reference: Marantz CD63 & CD67 mods list

Here you can find the service manual if you don't have it: http://www.raylectronics.nl/index_en.html

With a bigger Tx when the CD drive is run the voltage drop from the Tx output is around 0.5V but with the stock Tx you will find that the voltage can drop by almost 5V. Once a new Tx is fitted you will hear a tighter bass and the LF is much more extended. Worth a try and it is not that difficult

Last edited by higlander; 21st March 2013 at 03:28 PM.
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