Clocking the CDM-Pro2

[Elberoth]

Anyone have had any expirience with doing that ?

I'm torn between LC Audio X03, Telt Labs X03, AudioCom Clock 3 and Trichord Clock 4 (and their respective power supplies).

Any ideas ?

 

[loddie]

Not to hijack the thread, but has anyone added wordclock input to the CDpro2?

 

[apolon34]

Hi,

I made something like that using a x3 clock multiplier available in the market.

I made a tweak on the cd-pro2 to make it run from a 33.8688Mhz clock and then feed my 11.2896Mhz DAC clock to the multiplier and then to the cd-pro2.

it works perfectfully !

 

[Peter Daniel]

I made a tweak on the cd-pro2 to make it run from a 33.8688Mhz clock

Can you provide some details of that tweak?

That would be very useful for my ML31.5 transport that uses CDM12 IND with 33.8688Mhz clock which is not compatible with CD-Pro2 (for mechanism swaping).

 

[apolon34]

Hi,

The tweak is very simple, I just tied the SELPLL input pin of the SAA to ground. Originally, it has a pull-up resistor to VCC so you can leave it in place without problems and without the need to cut traces.

 

[Lexluthor]

Hi,

The tweak is very simple, I just tied the SELPLL input pin of the SAA to ground. Originally, it has a pull-up resistor to VCC so you can leave it in place without problems and without the need to cut traces.

I guess you solder the external clock where the original oscillator is mounted.

How did you remove the original crystal oscillator from the CD-PRO2 PCB? The picture shows how it is done for a CDM12 IND.

Could you mail a picture of the mod on CD-PRO2?

 

[Peter Daniel]

It's been described here; http://www.diy-high-end.com/cd/page25.html

 

[joeling39]

Hi,

This was what I did. I pulled out the 8.xxx mhz oscillator & soldered the leads of the aftermarket clock to the respective points shown in the pic.

Regards,
Joe Ling

PS : The clock used is a kwak clock 7

 

[apolon34]

I removed the original xtal completely.
For that you need to unsolder the 4 pads of the original crystal.

An improvement is that you don't need to remove the two caps near the crystal cause the 4 pads package makes a bridge between the caps and the SAA.

for the ground, I juste scratched a bit the pcb to see the copper and then soldered the ground on it.

 

[Lexluthor]

I will use an external Madrigal clock and swap CMD12 IND (SAA7345) with CD-PRO2M (SAA7324). However, the supply voltage of SAA7345 is 5.0 V and the supply voltage of SAA7324 is 3.3 V. Since the chip on CD-PRO2M runs on 3.3V do I need to mount a resitor in parallel between the wires? If so what should the resistanse be??

 

[Peter Daniel]

That info is posted here: http://www.diy-high-end.com/cd/page26.html

IMPORTANT: As the servo decoder chip runs on 3.3V a resistor of 100 Ohm needs to be mounted parallel between the purple and black wire close to or on the PRO2M PCB. The tolerance of the resistor is not critical.

BTW, why are you changing CDM12IND to CD-Pro?

 

[Lexluthor]

That info is posted here: http://www.diy-high-end.com/cd/page26.html
[BTW, why are you changing CDM12IND to CD-Pro?

Well, good question. I am actually quite satisfied with CDM12 IND but CD-PRO2M is supposed to to be better in several aspects and given the relatively low price it could be fun to upgrade:

1. the decoding chip SAA7324 shows better performances, especially with its improved error correction system and reads CD-RW.

2. the new firmware of the CD-Pro2M module has been improved as regard to playback of copyprotected discs (even thou my CDM12 plays CopyProtected discs without problems)

3. improved playability with out-of-specification discs (had a problem with Ziggy Stardust enhanced CD i.e not Red Book standard disc)

 

[Peter Daniel]

I might be interested in your CDM12 IND if you managed to do the change.

CDM12 in my ML31.5 plays everything, CD Pro1 in ML37 is more picky, but it's hard to say why is it, maybe the laser is not so good anymore.

 

[Lexluthor]

I might be interested in your CDM12 IND if you managed to do the change.

CDM12 in my ML31.5 plays everything, CD Pro1 in ML37 is more picky, but it's hard to say why is it, maybe the laser is not so good anymore.

I thought that both ML31.5 and ML37 used CDM12IND and not CD-PRO1. Anyway, if you need a new laser pickup you might get it from:

http://www.reptips.dk/reservedele/cd-laser/cdpro/cdprolaser.htm