Need Help About the YM3623 (from the Elektor DAC) - diyAudio
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Old 22nd February 2004, 10:24 PM   #1
Burli is offline Burli  Germany
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Smile Need Help About the YM3623 (from the Elektor DAC)

Hello to all of u !

I bougt the Elektor Dac with 2 PCM63P and the YM3623 from Yamaha on Ebay, but its not working.
If i connect a CD-Player the Error LED is permanantly on, and also the Deemphasis Relais switch on and of the hole time.
I tried different Sources (Cd-Players), but none worked.
Is there some way to test the YM3623 ? Maybe its broken ?
Does someone know where to get the YM3623 (best in Europe)


Has anyone made this experience with this Chip, or can u give me a hint ?

Thanks to all who want to help me
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Old 23rd February 2004, 10:59 AM   #2
guido is offline guido  Netherlands
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Cant really help you now, guess the first thing to do is to check the powersupply of the yam chip. I have more info at home, but it is hard to help from a distance. And the info is still in some moving-boxes...

If you cant get a new one, you could make some kind of small daughterboard that fits in the place of the yam chip containing CS8412 or 8414 and surrounding components.

If you get it working, check out how the gnd connections to the DAC are made and then read the pcm63 datasheet. They don't match, elektuur did not connect gnd properly.

Maybe you could do some modifications..

Greetings,
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Old 23rd February 2004, 11:15 AM   #3
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Hi guido,

I have a friend who has one of these lying around unused which he'll probably let me have to play around with. I haven't heard it in action for a few years now, but I remember it sounding rather nice, although I believe noise and distortion are rather high.

Have you any tips on tweaking it? The analogue stage looks rather complex to me, and I'm not convinced of the quality of there digital side of things either, particularly the ground signal routing.

Thanks for any info, and good luck Burli getting your DAC going - if you got it cheap you may well find you've picked up a bargain.

Dan
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Old 23rd February 2004, 11:29 AM   #4
Burli is offline Burli  Germany
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Hello !

i measured all Voltages at the YM and they are all correct.
Maybe i try the way guido mentioned with a small daughterboard and another chip to replace the YM3623B.

If anyone has already built such "replacement" for the YM in combination with an DF1700 digital filter i would be very pleased for the circuit diagram, because im not a pro on designing circuits

Nice wishes to all audio freaks :-)
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Old 23rd February 2004, 11:51 AM   #5
JohnW is offline JohnW  Hong Kong
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Hi,

Do you have the circuit? I seem to remember (maybe I'm confusing the articials) that that the SPDIF input was level shifted to TTL/CMOs by a 74HCU04. If I'm correct, then I would replace this device first.
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Old 23rd February 2004, 11:54 AM   #6
guido is offline guido  Netherlands
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Check out the DAC GTent worked on for tweaks.

http://members.chello.nl/~m.heijlige...tml/dactop.htm

As for the GND routing, check the datasheet on page 8 of the pcm63: "Both commons should be connected to an analog gnd plane as close to the pcm63 as possible".

Have an analog devices AN on the why of this, but only softcopy somewhere.. Basically: any voltage present between agnd and dgnd pin will be present in the output signal. So they should be connected together with a short pcb track. A resistor is (great, i found the settings again to include those ).

http://focus.ti.com/lit/ds/symlink/pcm63.pdf

Maybe Guido Tent could say more on this, he has experience with this DAC. I don't!

Greetings,
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Old 24th February 2004, 12:21 AM   #7
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I have several brand new YM3623 chips back home. I should be there in a few weeks. If you need any then, send me an e-mail.

Jocko
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Old 24th February 2004, 10:39 AM   #8
Nicke is offline Nicke  Sweden
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Default Re: Need Help About the YM3623 (from the Elektor DAC)

Quote:
Originally posted by Burli
Hello to all of u !

I bougt the Elektor Dac with 2 PCM63P and the YM3623 from Yamaha on Ebay, but its not working.
If i connect a CD-Player the Error LED is permanantly on, and also the Deemphasis Relais switch on and of the hole time.
I tried different Sources (Cd-Players), but none worked.
Is there some way to test the YM3623 ? Maybe its broken ?
Does someone know where to get the YM3623 (best in Europe)


Has anyone made this experience with this Chip, or can u give me a hint ?

Thanks to all who want to help me
I can´t help you with the repair,but when you get it working again I recommend that you chánge the analog stage.
I use this DAC with a discrete I-V stage(which is way better than the original one...).
Look here:


I-V stage

Good luck with the repair
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Old 24th February 2004, 11:26 AM   #9
alfsch is offline alfsch  Germany
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Hi,
I have 14 brand new YM3623 chips.
tell me, if you want some.
mfg
alf
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Old 24th February 2004, 09:42 PM   #10
Burli is offline Burli  Germany
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Hi All !
Thank you very much for your knowledge and your help again !

To John: Yes you are right there is a 74HCU04 at the input.
I will change this next, but there is definetly coming some kind of signal to the YM3623. Because if you connect a cd player in stop mode nothing happens. But if you start playback , the deemphasis starts switsching on and of (at least 60 times per minute), sorry i forgot to write this in the first post. Im not able to conclude something out of this, thats the reason i didnt wrote it...
(im such a noob sometimes )

I got several offers for working Yms (Maybe the last chance for me to get this DAC working ! (thanks to John, Alfsch and Jocko !)

Is there any possibility to measure the input signal without a scope ? Unfortunatly there is no way to get one for me, but i keep trying......

If i get this thing working i give a party and start tweaking :-)
(thanks to nickie and guido !)
Best wishes,
BURLI
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