Marantz CD63 & CD67 mods list - Page 1828 - diyAudio
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Old 9th July 2012, 08:46 PM   #18271
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I don't have any Black Gates STD, but I use Elna Silmic II in my DOS. I found that bypassing them with some 220n Wima MKS takes away the harshness and improved sound in general IMO.
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Old 9th July 2012, 11:14 PM   #18272
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I have some spare 220n MKS. I might give that a try some time - thanks.
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Old 10th July 2012, 07:43 AM   #18273
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Quote:
Originally Posted by Ben Hanke View Post
Plugged my DOS in last night. LEDs came on but no sound. Ho hum.
Hi Ben,

Any sound yet? I can post the schematic with voltages, so you can check the circuit if you like.

Regards,

Ray
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Old 10th July 2012, 08:23 AM   #18274
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That would be awesome, Ray. Honestly I'm not 100% sure I connected to the DAC correctly. I wired each +/- PWM out pin to the input on the side of the PCB with the corresponding regulator and the grounds to the analogue ground pins between them.
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Old 10th July 2012, 10:11 AM   #18275
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+In and -In of each channel go to RO/LO and RON/LON of the DAC. So +In to pin 25, -In to pin 23 and GND to pin 24 (U197) for the right channel, +In to pin 18, -In to pin 20 and GND to pin 19 (U198) for the left channel. Remove RD21 to RD24 by the way. Be careful with the traces on the player's board, they are very thin.

Then all you need is +/-15V supply voltage at the other side of the DOS board and you should be able to enjoy heavenly music at the output-pin :-)

Ray
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Old 10th July 2012, 10:33 AM   #18276
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Thanks Ray, that sounds like what I did except I just removed the op-amps for testing and not any of the resistors. Would they have stopped it from working?
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Old 10th July 2012, 11:47 AM   #18277
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No, there should be sound even if you leave the resistors in. They are 10k, so all they do is load the outputs of the DAC a bit. But it's better to remove them for a permanent install.

Here's the DOS schematic with some voltages.

Ray
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File Type: jpg DOS_CFP_CD67_volt.JPG (77.5 KB, 189 views)
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Old 10th July 2012, 11:56 AM   #18278
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Brilliant, thanks Ray!
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Old 10th July 2012, 12:08 PM   #18279
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Hope it helps!
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Old 11th July 2012, 09:53 PM   #18280
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Damn clock cost me 3 full rebuilds no clock in the mk3 version at the mo,Never suspected the clock sent the mech ape scrapping 2 transports. Full week no further on may be able to salvage may be 1 player.
At least i have music. alan
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Last edited by bikeral10; 11th July 2012 at 10:06 PM. Reason: more info
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