Marantz CD63 & CD67 mods list - Page 1300 - diyAudio
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Old 1st September 2009, 01:16 PM   #12991
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Quote:
Originally Posted by Thomo View Post
Bull, did you get any further with your cd63?

I also, just thought I'd post an update pic of my cd63 as it is at the moment.
Click the image to open in full size.

Driver IC's are all regged with SPower's, dac, decoder, servo and rf all have diy regs for analog and digital supplies. I just have one more reg for the dac to fit and then I can start adding the tx's and psu's. It's really sounding incredible considering driver ic's and all 5v is running off one 30va tx (buzzes like a fridge mind you)

Cheers, Lee.
Starting to look good there matey

Stick a 30VA on the +/- rails (minimum)

Brent
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Old 1st September 2009, 01:34 PM   #12992
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by Chivvyp View Post
I tried a load of things and nothing made any difference.

In the end I decided to connect them anyway (what's 1/2v between friends ). Lo and behold the voltages came back up again. Disconnected and had another play. Seems the 337s don't behave without a cap on the output. Must be specific to the 337s, the 317s work on without one.

Anyway, all's ok now, thanks for all the help and advice.
Hi Pete

Your input confirms my initial impressions.... 337 needs a cap and some load in the ouput.... I had just the same issues before and the sreg works fine once installed in the cdp.

Ricardo
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Old 1st September 2009, 01:42 PM   #12993
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You mean for the DOS?
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Old 1st September 2009, 01:45 PM   #12994
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by Malefoda View Post
You mean for the DOS?
No

The 337 based reg
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Old 1st September 2009, 01:46 PM   #12995
SimontY is offline SimontY  United Kingdom
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Steve/Bull,

As you know I've been away for 2 weeks. I can't believe our luck with the player going down after I was so careful installing those regulators. My guess is one of them has pulled off the board and lost its ground or output. Hopefully no big voltages have hit any chips, as I know that will kill them almost instantly.

I did think some of the wire I used didn't take the solder as well as other bits, so that's a possibility. Those and the front ribbon connector are likely where our problem's at.

I'll take a look very soon!! I will e-mail :-)

Simon
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Old 1st September 2009, 02:17 PM   #12996
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Been away myself and I quite like the look of the Forum

Brent
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Old 1st September 2009, 02:26 PM   #12997
6h5c is offline 6h5c  Netherlands
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Quote:
Originally Posted by Malefoda View Post
I have a question as stupid as always. There must be technical needs/explanations.
In headphones matter, an op amp is used to amplify the signal... wich must be attenuated!
Won't a CDP output just drive it fine directly?

Matthieu
It's not as stupid as you may think, because many simple headphone circuits use only one opamp. If you connect a headphone directly to the opamps in the player, it will work fine. You'll be listening to one fixed level though, without any volume pot before the opamps . The line level needs some amplification as well. That's why the headphone section usually uses a separate circuit with volume pot.

Ray
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Old 1st September 2009, 02:30 PM   #12998
6h5c is offline 6h5c  Netherlands
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Quote:
Originally Posted by EIRA View Post
I use a CD-94 (with tent clock XO) in combination with Denon DA-500. I have made some mods to my cd-94, which I still like very much. I just do not know exactly how to take out the muting part out of the cd-94. Where should I start?
Your help would be much appreciated.

Eira
Hi Eira,

The muting section is usually two or four transistors connected between the player's output and GND, just before the RCA. You can locate them by studying the traces on the PCB, but a schematic of the output section would be nice. The transistors mounted closest to the RCA's are probably it.

Ray
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Old 1st September 2009, 02:31 PM   #12999
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Bump
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Old 1st September 2009, 02:32 PM   #13000
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13.000 is here!!!!!
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