Marantz CD63 & CD67 mods list - Page 1372 - diyAudio
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Old 11th December 2009, 11:08 PM   #13711
6h5c is offline 6h5c  Netherlands
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Yes, the DOS... thanks guys. The DOS boards are sold out unfortunately
I donated the profit to this forum, ain't I a generous guy! It will get me a nice T-shirt in return though

Ray
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The new DOS-CFP board is out!

Last edited by 6h5c; 11th December 2009 at 11:11 PM.
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Old 12th December 2009, 06:08 PM   #13712
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Hi there,
There's Ray written in my player now!

Few times ago we said that analog stage can be left for the end...
It's not the end (many regs to come) but it's sooo good, even if it needs some burn-in (how many hours to your xp guys?).

Regards,
Matthieu
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Old 12th December 2009, 07:56 PM   #13713
6h5c is offline 6h5c  Netherlands
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Cool! Looks very nice, i'm glad you like it. I guess it can take a week or two before it reaches full potential. What kind of regs did you use?

Ray
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The new DOS-CFP board is out!

Last edited by 6h5c; 12th December 2009 at 07:58 PM.
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Old 12th December 2009, 11:22 PM   #13714
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Hi Ray,

just some 317/337! Simple, cute... and free

Matthieu
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Old 13th December 2009, 03:24 AM   #13715
quan is offline quan  Australia
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Hi Mat, what caps are those of DOS? Huge+++.
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Old 13th December 2009, 06:46 AM   #13716
pooya is offline pooya  Germany
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Quote:
Originally Posted by 6h5c View Post
As for the servo supply, in a CD63 the servo voltages are unregulated, so serious gains can be made here. In a CD67, the supply is regulated with a 7805.
My CD transport use for servo (for TCA0372 ) +/-9V rail from LM317/337 (the simpliest version without diodes).

Quote:
Originally Posted by 6h5c View Post
Most of the standard regulators have fairly good load regulation (only 2...15mV voltage change for full load ON/OFF) and should be able to deal with the PWM driven motor current. The step response is improved drastically by adding a few uF of output capacity, so the 100uF or more in the player should provide plenty buffering.

I can imagine that in some cases the regulator can become unstable with large output caps, I have seen this several times now with the new ONSemi regulators (MC78xxCT series), the ones with the thin metal tab on the housing. An output cap over 100/220uF will make these things oscillate for sure. I have stopped using them and use the ones from ST or NSC now. In the race for smaller and smaller output caps they probably changed the circuit..
So, you are using ST/NSC 78XX regulators for servo...

Quote:
Originally Posted by 6h5c View Post
I never tried a passive supply based on a choke here, but it has the advantage that it is a very effective barrier for noise, and won't go berserk with large output caps. You should make sure that the output impedance is low enough when using a passive circuit (something that can be easily realized by feedback) or the cure may be worse than the problem.

Regards,

Ray
If I find some free time next week I will simulate few supplies and post the results.

Regards,
Alex
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Old 13th December 2009, 03:06 PM   #13717
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Quote:
Originally Posted by quan View Post
Hi Mat, what caps are those of DOS? Huge+++.
Hi Quan,
it's a sandwich of a standard MKP 6.8F, a K40Y-9 0.47F russian cap and a FT-1 0.022F Tflon cap. That may not be the best* but it's what I have in hand. If/when I'll built a CD-40 the winner will be tested with these combo and with Obbligato.
And that's not big, I was thinking of fitting K75-10 10F first...

Regards,
Matthieu

*find the sound a bit mushy in the low mids and a bit digital on femal voices, maybe because it's not burnt-in, the caps combo, no dedicated 5V regs but the factory one, or even the CD-63 sound...
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Old 13th December 2009, 04:03 PM   #13718
6h5c is offline 6h5c  Netherlands
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Quote:
Originally Posted by Malefoda View Post
Hi Ray,

just some 317/337! Simple, cute... and free

Matthieu
Those must be the NSC samples then

Quote:
Originally Posted by poooya View Post
My CD transport use for servo (for TCA0372 ) +/-9V rail from LM317/337 (the simpliest version without diodes).

So, you are using ST/NSC 78XX regulators for servo...

If I find some free time next week I will simulate few supplies and post the results.

Regards,
Alex
I've used both 7808/7908, 7809/7909 and LM317/337. All work well as far as I can tell. It depends a bit on what I have in stock when a player comes along . I hope the choke version can supply enough current, as the motor's startup peaks are quite high. Looking forward to see your results!

Ray
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The new DOS-CFP board is out!

Last edited by 6h5c; 13th December 2009 at 04:08 PM.
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Old 13th December 2009, 08:25 PM   #13719
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Tried adding decoder regs... Ended up with a disc motor which spins like mad upon power on. It continues endlessly, and service mode gives 'Error 13, spindle error'. The motor also spins like mad without a disc in it, even with the tray open.

I might have burned C505 with clumsy soldering, but could this be the problem? I've now put back the original resistors R508 and R511 where I had put the regs, but the problems persists.

Any ideas?

Last edited by studiostevus; 13th December 2009 at 08:31 PM.
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Old 14th December 2009, 09:29 AM   #13720
SimontY is offline SimontY  United Kingdom
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Bargain clock on Ebay?

Audiocom Superclock 4-s Low Jitter Clock 24.576Mhz on eBay (end time 21-Dec-09 08:30:10 GMT)

Simon
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