Marantz CD-46 mods

[gorfeas]

This my first post here.
I have been reading within the forum about modifying cd players and decided to give it a go with my Marantz CD-46.
First the cd player was dying on me not wanting to read cd's anymore skipping etc. So I started googling around and found this article CD-46 repair but replacement pickup was quite expensive so I kept googling.... and TAARAAANN! bingo! some guy was talking about regulating the laser's intensity by turning a pot that is usually locate dnear the laser lens. And so I did and it worked! Unfortunatelly I no longer have the link to that page but you can google it.
So now I have a working CD-46 with it's case still open.... So why not throw a decent IEC mains conector to use with my brand new Merlino mains cable and while I am at it replace those ugly steel rca jacks in the back with some gold ones.
So, there you go the first step has been taken. Now I found a really nice guy in a forum that passed me the CD-46 schematics (thanx Monsan S. ) so I got those and since I am a real beginner in electronics I don't know where to start off...
I would need your help in locating/replacing op-amps, and maybe adjusting some analog stage (tubed) found in this forum on other threads in order to put it inside the cd-46.
To be honest I would like to change the cd players box, since it is really flimsy thin tin like, with no weight whatsoever.
How about Power supply? Is replacing the transformer and a couple of caps enough?
Thank you all for your feedback

[JC Fardo]

I did some search at Audio Asylum forum by the time I was attempting to tweak my cd player.

CD player tweaks


Hope this helps

Hasta siempre

Jose Carlos

[Guido Tent]

Originally posted by gorfeas
This my first post here.
I have been reading within the forum about modifying cd players and decided to give it a go with my Marantz CD-46.
First the cd player was dying on me not wanting to read cd's anymore skipping etc. So I started googling around and found this article CD-46 repair but replacement pickup was quite expensive so I kept googling.... and TAARAAANN! bingo! some guy was talking about regulating the laser's intensity by turning a pot that is usually locate dnear the laser lens. And so I did and it worked! Unfortunatelly I no longer have the link to that page but you can google it.
So now I have a working CD-46 with it's case still open.... So why not throw a decent IEC mains conector to use with my brand new Merlino mains cable and while I am at it replace those ugly steel rca jacks in the back with some gold ones.
So, there you go the first step has been taken. Now I found a really nice guy in a forum that passed me the CD-46 schematics (thanx Monsan S. ) so I got those and since I am a real beginner in electronics I don't know where to start off...
I would need your help in locating/replacing op-amps, and maybe adjusting some analog stage (tubed) found in this forum on other threads in order to put it inside the cd-46.
To be honest I would like to change the cd players box, since it is really flimsy thin tin like, with no weight whatsoever.
How about Power supply? Is replacing the transformer and a couple of caps enough?
Thank you all for your feedback

Hola Gorfeas,

Congratulations on reparing the CD46. To make sure that the laser is not giving too much power, you can check the level of RF signal. If you have scheamtics / manual, there will be instructions.

I cannot resist in advising to upgrade the clock.

hasta luego

[Fidelity Audio]

This may be a more expensive marantz player and the pcb layout is different, but the principle is the same.

Have a read and see if it gets your mind thinking.

There are some really tasty pics on there too.

Marantz CD63 & CD67 mods list

[prasad1964]

Hi fireind,

I also need schematic for CD46. Can you please send me a copy. Or can you give me email of gentleman, so that I can also request him for me.

Thanks and best Regards

Prasad

[dmaimone]

hi all,
Please let me know if you still have the schematics/service manual for the cd46

Thanks in advance,
domenico

[gorfeas]

yes i still have them

[dmaimone]

Hi gorfeas!
can you send me a copy?
my address is dmaimoneATflexmail.it

Thanks and Regards

domenico

[mr_push_pull]

Guido, Gorfeas

I've owned a CD46. It's not worth tweaking, it uses one of those highly integrated SAA7xxx digital processors. It's controlled via a serial MCU interface by writing to internal registers as opposed to the more basic SAA's which are controlled by strap inputs. And if I'm not mistaking... it does a 0.5 dB downscaling which can't be disabled by any means. It's optimistic to imagine that the SAA does some fancy 64 bit floating point processing to the signal So, better go for the older models which use the simpler digital filters - i.e. bybass-able.
Ah, it just occured to me that Guido should know this better

Regards,
Mr. Push Pull

[samoth]

From what I have seen on diyparadise.com the CD-46 looks exactly the same as the Philips CD720 I'm looking into right now. Except the Philips has a double-sided PCB.

But what confuses me is that on diyparadise it says it doesn't do oversampling. Is there any source to "believe" that?

btw it's a SAA7345GP

Nevertheless I would be very interested in a copy of the service manual

Regards,
samoth