Help me mod Pioneer PD-S505/605

[Bassivus]

Hi,

I am planning to upgrade my player to decent standalone player but I bought it primarily for transport/DAC use(I don't own no DAC yet!) I have no education in electrics, but I have some previous experience, tweaking my Philips 721 CDP and building WNA headamp.

My basic strategy is:

1. Upgrade power section with pretty toroid, Caps....
2. Clock it with KwakClock
3. For analog section swap the NJM4558 with some AD826 ...


I already changed power cord, and am in process of making the case stronger and resonant proof...

I found the free scheme for download:

http://www.eserviceinfo.com/downloadsm/22612/Pioneer_pd-s605.html
(scroll the page down a bit for the Download link)

I have no clue what toroid to look for. Would it be better to use two smaller ones etc. How to regulate etc.

Sorry for bad English

 

[Bassivus]

Here is the pic of the cable I made for CDP

 

[Leolabs]

I have no clue what toroid to look for

You may try Nuvotem Talema,they have pinned board version.

 

[Bassivus]

Thanks for the reply,


In fact I meant I’m clueless about something else. I would not worry if one could not drop in place of old transformer since there is LOTS of space for the bigger one. I was planning to get one of my local manufacturers: www.trafomatic.com

What I wonder is if its better to get one bigger – perhaps 50 or 80VA for both digital and audio or leave the old one in place for digital and use new one just for audio section (or vice versa). I just know I need 230Vprimary but I don’t know what to look for in secondary in both cases???

 

[Ruach]

Hi,

If you can post up an internal picture of the Pioneer, then it will be easy for anyone to offer any tips on modding

 

[Bassivus]

Pics coming!!!

PSU

 

[Bassivus]

just some wima bypas

 

[Bassivus]

Here is part of shematics for analog out:

 

[Bassivus]

and the board itself...

 

[Bassivus]

You can see I just "prepared" the OpAmp for quick change

 

[Guido Tent]

You can see I just "prepared" the OpAmp for quick change

I'd suggest to replace all power supply diodes for Schottky Barier types like

http://nl.farnell.com/jsp/endecaSearch/partDetail.jsp?SKU=4897432

and remove muting transistors Q403/404/453/454

best

Guido

 

[Ryssen]

On my PDS904 I changed the regulators for better ones..

 

[Bassivus]

I'd suggest to replace all power supply diodes for Schottky Barier types like

I'll do it

and remove muting transistors Q403/404/453/454

best

Guido

Ok, I was planing to do it but I'm not sure if it is OK just to take them out?
What do you think about the caps C431/432/433/434 can I take out/replace them ?

 

[Guido Tent]

I'll do it



Ok, I was planing to do it but I'm not sure if it is OK just to take them out?
What do you think about the caps C431/432/433/434 can I take out/replace them ?

You can cut the mute transistors out, no problem

the caps you mention: best to leave them in place, replace them by for example Panasonic FC typs or Black Gate

cheers

 

[Bassivus]

On my PDS904 I changed the regulators for better ones..

Which ones?

This is actually leading me that if I rebuild the existing power supply with the better parts, mayby put stronger transformer could do good enough, rather than make new one/two separate for audio/digital/drive? Is the original design good enough so it will do just with better parts
I mean, I now that is cheaper and I am on tight budget, but which path to choose: More money in power section or Clock or analog???

 

[Bassivus]

You can cut the mute transistors out, no problem

the caps you mention: best to leave them in place, replace them by for example Panasonic FC typs or Black Gate

cheers

Ok thanks! I think I could salvage some rubycon NP from my Philips721(RIP) but smaller values, could they do?

 

[Guido Tent]

Ok thanks! I think I could salvage some rubycon NP from my Philips721(RIP) but smaller values, could they do?

that will work, but don''t make them too small

Panasonic FC are realy fine and dead cheap by the way

 

[Ryssen]

On PDS904 there was one for +5v and two for +15 and -15v for the analog out,don´t know if it´s the same for your´s.

 

[Bassivus]

On PDS904 there was one for +5v and two for +15 and -15v for the analog out,don´t know if it´s the same for your´s.

Correct me if I'm wrong but I don't see no regulation other than 5v? And another says 26v but no regulator just diodes??? Help please?!?!
http://www.diyaudio.com/forums/attachment.php?s=&postid=1002937&stamp=1157993744

Help me read this scheme:

 

[hifi]

I belive that would be for the display.



The boards look quite similar to those I ripped out of my 904 and from what I recall this is the voltages required:

The Mcu + Display wanted +/-5V and 5V AC and 25V DC

The data proccessing chips used +/-5V. And the Servos where driven from +/- 9V

Also a reset pulse generator was needed to make the player start as the original regulator chip (wich i removed) had that function built in.

Here is what I did:

http://www.diyaudio.com/forums/showthread.php?postid=794910#post794910