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Old 6th March 2013, 04:47 PM   #121
dacen is offline dacen  Norway
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@Salar. Where in the circuit are you introducing your external clock? On the servo board or on the D/A side? Just curious ?
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Old 6th March 2013, 10:40 PM   #122
Salar is offline Salar  Germany
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Nowhere, nothing modified. Just hope that your mod will cure my skipping problem as well. But I have no time right now to do it.
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Old 6th March 2013, 11:17 PM   #123
dacen is offline dacen  Norway
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Ok. Resonator X601 is listed in the Bill Of Material as 16Mhz but it is actually 16.9344 Mhz. The exact frequency. The odd thing is the way they synchronize it to the DAC side.
And by the way, so far things seems promising but we have to give it some more time.
The sound produced is definitely much much better.
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Old 7th March 2013, 08:36 AM   #124
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Modding the power supply with MKP capacitors could be tried as I suspect the high frequency response of the psu is not good enough. It is a shot in the dark, but it has a good reason.
Even if you connect an external clock, the other issues point towards the common source of problem.

Gajanan Phadte
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Old 10th March 2013, 09:24 PM   #125
Salar is offline Salar  Germany
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@dacen @ilcapo
Any news? It has become cold again for some days, so i could try dacenīs mod.
What about soldering on connections leading to the laser diode?
Any risk of causing electrostatic breakdown?

Last edited by Salar; 10th March 2013 at 09:27 PM.
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Old 10th March 2013, 10:49 PM   #126
dacen is offline dacen  Norway
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" What about soldering on connections leading to the laser diode? " I would not recommend that. I did a lot of changes to the board as I had the player apart. It might not be necessary with all of those changes. Try the simplest first. Solder a strap across D602 and connection directly to pin 2,3 IC602 is in place. Remove JW600 and connect JW602 to ground. This might do the trick for you. I have had no problems so far. The player starts every time when cold and plays music flawlessly. As you can see on my drawing I have also increased Power On Reset slightly. I have increased C697 from 3.3uF to 4.7uF just in case.

Last edited by dacen; 10th March 2013 at 11:04 PM.
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Old 10th March 2013, 11:00 PM   #127
Salar is offline Salar  Germany
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Iīll try that. Can the laser be disconnected from the servo board without any risk?
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Old 10th March 2013, 11:20 PM   #128
dacen is offline dacen  Norway
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There is a small risk if you work on surfaces that creates static charges, so try to avoid that. And careful with the lock mechanism on the flex cable connector. Donīt pull!. Release first!
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Old 11th March 2013, 07:11 AM   #129
Salar is offline Salar  Germany
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Dear dacen, I guess it is JW601 instead of "JW602"? And do the diodes D602 really need to be bypassed?
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Old 11th March 2013, 01:26 PM   #130
dacen is offline dacen  Norway
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My fault, of course it is W601. You are interested in getting a solid low signal on base of Q601. If you leave D602 in circuit the base of Q601 can take any value higher than that, so yes, bypass. If this is successful for both of us I have a permanent solution for this function. That is adding a NAND gate there. What we are doing now is trying to locate the problem and verify it. (if you donīt have a NAND gate I will send you one ,74HC00)

Last edited by dacen; 11th March 2013 at 01:47 PM.
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