Marantz CD63 reclock with direct TCXO - diyAudio
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Old 3rd April 2013, 01:23 PM   #1
Will is offline Will  Malaysia
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Default Marantz CD63 reclock with direct TCXO

I've searched and it seems that everyone who has reclocked the cd63 is either using a Kwak or Audiocom or LCAudio or some standard reclocking modules.

Recently I tried a direct reclocking method using a 16.9344MHz (I'm not sure if its a TCXO or a VCXO as its a crystal salvaged from a Primare CD20 cdp) and feeding its 16.9344MHz output directly to the pin 28 of the chip SM5872BS to no avail. It does not work. Adding some resistance and capacitor to remove DC offset also does not work. Am I missing something?

Please share your experience using a direct TCXO/VCXO reclocking.

PS: All due diligence has been done i.e. removed CD02, CD03, RD02 and XD01 (refer to CD63 service manual)

cheers
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Last edited by Will; 3rd April 2013 at 01:26 PM.
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Old 3rd April 2013, 07:29 PM   #2
poynton is offline poynton  United Kingdom
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I assume that you have connected the +5v and ground to the clock module.

Have you a 'scope to check the output?



Andy

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Old 4th April 2013, 12:08 AM   #3
Will is offline Will  Malaysia
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I built a 5v using 7805 and its output is filtered with 2mH inductance before feeding the TCXO. Wished I had a scope to see what's happening but alas, nevertheless I did measure the output with a DMM, it reads 3.5VDC.
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Old 4th April 2013, 12:46 AM   #4
dacen is offline dacen  Norway
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Put an electrolytic capacitor in between the 2mH and the XO and ground (100-300uF). This ground must be connected to the ground plane in your player. If this does not help, you have to check that you are connecting the power and gnd to the right pins on the XO. See datasheet: http://www.golledge.com/pdf/products/osc_ld/gxou101.pdf You have to check what pin 1 does on your XO. Have a look at the circuit it is taken from and find out if it is an enable signal of some kind or if it is not connected.
This should be straightforward, and should work if the output is the correct frequency. The value you measure with your DMM depends on the duty cycle of the output of the XO.

Last edited by dacen; 4th April 2013 at 01:01 AM.
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Old 4th April 2013, 07:29 AM   #5
Will is offline Will  Malaysia
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I didn't elaborate on my 5v, it's connected this way:

7805 -- 2x470uf -- 1mh -- 2x470uf -- 1mh -- 2x470uf -- ferrite -- 100uf -- XO

The XO I'm using is an ESKA MCO-7100A. It's a DIL14 package
ESKA CRYSTALS - Fast Worldwide Delivery of Quartz Crystal Units

Looking at the data on the DIL14, it seems that pin1 is just NC.

I'm still not getting it. Yeah I'd agree this should be a straight forward implementation. I've done it on my Behringer DCX2496 and DEQ2496 using a Tentlabs 24.576Mhz TCXO.
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Old 4th April 2013, 10:15 AM   #6
marce is offline marce  United Kingdom
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You cant play with clocks without at least a basic scope, how do you know if you are improving anything!
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Old 4th April 2013, 11:39 AM   #7
Will is offline Will  Malaysia
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My initial quest was to salvage all parts I have and put it in an ageing player. Surely the tcxo is miles better than the 2 pin oscillator.

Of course, the final arbitrator, use your ears, silly!
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Old 4th April 2013, 02:52 PM   #8
marce is offline marce  United Kingdom
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How can you know whether the changes you have made have improved the clock without looking at the waveform with a scope, and even that will only give an arbitry indication of any improvements, or just buggering the signal up. You need some specialised equipment to measure jitter etc. Nor yours ears cannot tell you what is going on in the digital domain, you need to use measurement and see what is happening, to think otherwise is stupid. The clock is one of the most critical signal of many digital designs, and just replacing one thing with another without any investigation or equipment to monitor the changes, is just playing, you have no metrics to compare changes to, other than your ears, which are useless in this case.
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Old 4th April 2013, 03:06 PM   #9
Will is offline Will  Malaysia
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Quote:
Originally Posted by marce View Post
Nor yours ears cannot tell you what is going on in the digital domain, you need to use measurement and see what is happening, to think otherwise is stupid. The clock is one of the most critical signal of many digital designs, and just replacing one thing with another without any investigation or equipment to monitor the changes, is just playing, you have no metrics to compare changes to, other than your ears, which are useless in this case.
You're telling me you can't hear the difference between a 2 pin crystal and a simple TCXO ? Then you gotta train your ears more and stop typing this stoopid comment. Bugger off if you can't be of help. I really don't need children screaming.
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Old 4th April 2013, 03:32 PM   #10
dacen is offline dacen  Norway
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Is pin 1 connected to (part of) the metal casing of the XO ?
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