help required with clock frequency for phillips pro 2 lf transport

[JOHNNYCR100]

Dear Sirs,

Can you advise the following: I have a low noise PSU (flea) suitable for powering a Txco clock for my Phillips Pro 2 LF transport .

The oscillator on the transport is 8.4672 MHz however i happen to have a 16.9344 MHz Txco to hand --I notice this is used by German CD player website (Acusticperfect) and sold as a module to clock a Phillips CD Pro 2 !)

so.... could i also clock the cd pro 2 at 16.9344 MHz (as opposed to 8.4672 MHz)

Also... any links to a definitive instructions for replacing a clock on this transport seem to be broken or removed..any ideas on this, I cant find a solution!

my thanks as ever

johnny

 

[UV101]

The pro 2 uses the SAA7324 servo decoder dac chip.

It could be clocked at 16.9344Mhz, but I have not investigated the chip settings for this.

The clock needs to connect to the CRIN pin 16.

There's a fair bit of info on the tent labs site if you google it 🙂

http://www.tentlabs.com/Components/page4/assets/cdpro2mVAUspec11.pdf

http://www.akustik-perfekt.homepage.t-online.de/the-audio-collection/SAA7324_2.pdf

BTW, there are quite a few warnings advising not to run the player without a clock........I believe it can damage the SAA7324

 

[JOHNNYCR100]

Thank you for the reply

Hi UV101,

Thanks for getting back though I was all alone here😡

I read the attached documents , I must have missed 7.1.1 which says the clock can be 16.9344Mhz if required (but its seems mostly 8.4672 as default from the factory)

There is/was a promising link on the Tentlabs site about fitting a clock but the link appears broken, there was (a few years ago) some good practical info on the daisy laser site but that's seem gone? I think you have to put a 75 ohm resistor across the clock inputs on the cd chassis for loading?

The tech stuff you kindly attached says about using a 16.9344 clock but also mentions about changing shadow registers?- that don't sound like plug and play as far as I can determine? (and I don't know how to do that!)

I will stick with the 8 meg clock (which is the one its using just now)

I will get an 8 meg tentlads clock (unless any has tried a 16 meg clock and it works sort of plug and play?-- is there any advantage in this?)

thanks again UV101 I shall read the Tec stuff attached.

best regards

Johnny

 

[JOHNNYCR100]

SAA7324 Clock input voltage limit.

Hi Gents--One thing occurs to me if I relock my CD Pro2 would I destroy the Servo chip by putting a clock of 5 volts amplitude in to it?-- is it expecting 3.3 volts?

I have looked at the SAA7324 Data sheet but did not see any info relating to clock amplitude and possible damage.

regards

jOHNNY