Marantz CD63 & CD67 mods list

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#2,143
SimontY said:
Evening fellow modders,

I'm taking another look at my dead display. I swapped D851 for a new diode and replaced Q851 with a 7912. Neither of these changes made any difference.

The reg voltages are:

1- 0 (ground)
2- -37
3- -26

Just as it was before I changed the reg to a -12. I have no idea what's going on with it :xeye:

Ok, measured more:

R854 measures -26v EACH side.
D853 reads 725mV in the diode test.

Simon
Click to expand...


Remember when I tested this on my player and I removed the gnd pin so the output was -30ish. I still had display (just a little brighter).

The fact pin 1 is 0V then it must be ground.
Pin 2 for input is -37. This is too high. It sould be approx -31.5V

Why is the input so high. Measure across D851, the cathode should be -21V.

Also just to make sure go with what Andy said earlier and link between your gnd diode and go to star earth.

Brent
 
#2,147
rowemeister said:
Remember when I tested this on my player and I removed the gnd pin so the output was -30ish. I still had display (just a little brighter).

The fact pin 1 is 0V then it must be ground.
Pin 2 for input is -37. This is too high. It sould be approx -31.5V

Why is the input so high. Measure across D851, the cathode should be -21V.

Also just to make sure go with what Andy said earlier and link between your gnd diode and go to star earth.

Brent
Click to expand...

Hi Rowe,

I changed the regulator just to remove any blame from it, I didn't think it was faulty.

I'll try measuring D851 next, and jumpering like Andy said.

Also,

Thanks for the lovely messages guys, lol :whazzat:

Had a nice meal, pissup to follow on Saturday. :att'n:

Simon
 
#2,148
1.) Firebombed and canabalized cd63 with 'High temperature Schottky diodes with boron-doped homoepitaxial diamond base'
2.) Another canabalized 63 with the life span of an ant in boiling water !!!!
4.) Modified emu 0404, with a special happy bithday to simon the man , MAN < MAN MAN < MAN MAN
Click to expand...

Two Great things about this thread one is the fact you learn something new on a daily basies. the other is that adfinni's sources change daily also.

What is the life span of a ant in boiling water? :hot:
 
#2,150
adfinni said:
OMG simon ts yours brthday. HAPPPY VBIRHTIDAY>. OMG, the modllesbororo gane was amaign tongin 2-1 down at 1/2 time (3-1 done on ag), thne the came back to win. WOW.

i cant believe u didnt mentio it was your bithday. OMG. hope u ahd an amazing nite, colllecting your free oap bus pass an dall that.
xxxxxxxxxxxxxxxxxxxxxx

love ad. xxxxxxxxxxxxxx
Click to expand...


LOL !!!

I don't drink brent, what made you think that???? 😉

We went down to the pub for some grub and the footie, and it turned out to be an amazing game. middlesboro 1-0 down going into the second leg. With the score 2-1 to bucharest at half time, middlesboro came back to win 4-3 😀 😀

Had 3 pints of cider at the pub, then drunk another 8 cans of 6% scrumpy at home :dead:

Great night, and i hope you had a great birthday simon :drink: :drink: :drink:

Gooch, your right about that, top thread, and my sig does seem to get change all the time 😀 I just thought of dead ants in boiling water, as a joke about lifespans of suicide bombers might offend people, and its summer the time of the flying ants.

Brentty boy, your certainly right about the lifespan of my player, it likes to die, A LOT !

adam
 
#2,151
adfinni said:



LOL !!!

I don't drink brent, what made you think that???? 😉

We went down to the pub for some grub and the footie, and it turned out to be an amazing game. middlesboro 1-0 down going into the second leg. With the score 2-1 to bucharest at half time, middlesboro came back to win 4-3 😀 😀

Had 3 pints of cider at the pub, then drunk another 8 cans of 6% scrumpy at home :dead:

Great night, and i hope you had a great birthday simon :drink: :drink: :drink:

Gooch, your right about that, top thread, and my sig does seem to get change all the time 😀 I just thought of dead ants in boiling water, as a joke about lifespans of suicide bombers might offend people, and its summer the time of the flying ants.

Brentty boy, your certainly right about the lifespan of my player, it likes to die, A LOT !

adam
Click to expand...


Can you write homoepitaxial?
I thought there was a new EC law !
 
#2,153
Ready to play!

It's fitted and the machine is up and running. But I have NO reference yet.
 

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#2,156
List of CD-players vs. DACs

I've just started modding my CD-63mkII which I bought 2 weeks ago as second-hand. Infact I am finished with Phase 1, with the components I had available at home (bigger caps for additional decoupling of all the power lines, plenty of SMD X7R caps here and there in close vicinity of the ICs, rerouting the clock at the DAC etc). I am probably starting with the second final phase next weekend when I buy some additional components... By the way the CD-player started sounding a little bit deeper, the bass became stronger but more important razor sharp with a visible impact and high rising slope, while the subtle details I could only hear in much more high-end equipment has finally started to appear. Unfortunately, not in all tracks and it's maybe kind of placebo effect, but that's why I am going to continue with the modifications: separate PSU for the DAC, maybe an external clock and certainly a new analog filter. 2 weeks is definitely not a long time to get used to a specific sound of CD-player and notice changes in it after modifications.

I have the following question: Does anybody know of some list where substantial number of CD-players is listed together with the type (1-bit Sigma-Delta, multibit) and the chip number of the DAC implemented? That will probably help me and other guys around find a suitable CD-player for the next modification project. There are so many second-hand, old but good CD-players out there with bargain prices...

Thanks in advance,
P.
 
#2,157
Re: List of CD-players vs. DACs

ratep2001 said:


I have the following question: Does anybody know of some list where substantial number of CD-players is listed together with the type (1-bit Sigma-Delta, multibit) and the chip number of the DAC implemented?

Thanks in advance,
P.
Click to expand...

Hi,

http://www.freeweb.hu/mestertuning/dac.php?lang=hu

Warning there are a few errors in the document (such as saa7220 dac).

Google, and the forum is a good tool to confirm dac.
 
#2,160
Re: transformer output

disco said:
Having a pair of Lundahl 1646 1+1+1+1 : 2 + 2 audio transformers collecting dust, I wondered how they would perform with regard to the opamp or discrete outputs.

Not quite sure how to connect I would appreciate input on this matter.
Click to expand...

HI.

these are possibly not the best Txs to try - too many windings on the primary !

But if you want to try,

wire the primaries in series / parallel to give a centre tapped winding - centre tap to ground / hot ends to the DAC outputs

wire the secondaries in series - try straight to the amp via a 50k volume control [ the Tx must see a high impedance ]

Andy
 
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