Old Philips DAC module - info. required.

[poynton]

Originally posted by ramchip
......

Hope this helps!

Hi.

Can you post a photo of the whole board rather than just a portion ?

Thanks.
Andy

[rfbrw]

Where is the disc mechanism?

[guido]

The heatsink on the MAB controller

It's the 1541 that get's hot (and the 7220)

Weird.


As for your pcb, it looks a lot like one i took out of an aristona cd1006, which would be philips cd106. Only there the old chipset is used; 7220A and 1541 without A. PCB looks similar, only some components differ or are fitted/not fitted.

Transport there was a cdm2. Maybe your's uses cdm4/31.

The connector to the display/keyboard pcb (upper left in your picture) is 5 pins, right?

coding on pcb is 8204 055 01073 (guessing april 82)

[ramchip]

The image is only missing a couple of cm at the top and few more to the right. At the top there are ribbon cable connectors to the CDM and the PSU. At the right there are PSU parts (regulators and capacitors) and the audio output connectors.
There ought to be enough detail here to identify the PCB, the chip layout and orientation are usually sufficient. In addition the PCB serial numbers are as follows:
Component side: 3104 103 34454 and 8204 055 01063
Solder side: 3104 103 34454 and 8204 055 01073

On the Grundig CD-9000 version of this PCB the last three digits are different so it's quite close. My version doesn't have the PCB headers near the LM833Ns
like the Grundig board, so fewer options are used.
I've included a shot of the Grundig PCB cropped from the Lampizator's photo of that machine (- thanks Lukasz).

There are probably quite a few early Philips CD players with this PCB so if anyone has a service manual with details of this board it would be great to hear from you!

Just seen new postings. The CDM is at the end of the ribbon cable and is working fine so there's no need to disturb it.

Guido! The PCB serial number you quote matches my solder-side number!
The connector in the upper left of my original picture is the I2C bus connector. This is the one I'm monitoring and looking for the CD track number, but so far that has not been successful. Was that connector used in the Aristona cd1006/Philips cd106?

Regards,
ramchip

[poynton]

It's a Philips CD160.

I have the manual if you want any circuit info (paper not .pdf)

It is also similar to the Marantz CD273.

Andy

[carawu]

The CD640 or CD660 is very similar.
You can download the service manuals here:
http://www.audioamp.kylos.pl/audio/m...titleA&show=10

[ramchip]

Thanks for the link carawu - that was very interesting!
Thanks for the offer poynton, but I think I had it now, the CD640 is the same.
As suspected, the service manual has nothing about the details of I2C bus usage. I'll have to improve my bus monitor to have any hope of using a PIC to control the CD player.
Thanks again to all the diyAudio folks that have helped.

Regards,
ramchip

[guido]

By taking it out of the aristona, i do not mean that it does not work anymore It still works on the workbench, pcb's and cdm just spread out. The keyboard pcb contains a motorola controller on the other side of i2c.

So i do have the pcb working and i do have a logic analyser just behind it..... What do you need to know exactly ?? Could have a look. Also have an i2c monitoring program on a pc, but i'm not shure it still works.

Btw, the only keys i have are the normal keys like stop and play etc. No number keys as it is a budget model So not cd track number...

[carawu]

Hm...sounds like the old PC-programs for controlling cdmpro/cdm12 via i2s....

Anybody can share actual links...else I dig in the dust (=my HD).

Carsten

[guido]

It's the i2c monitor & debugger from Jan Verhoeven from 1998. But i don't have the hardware at hand and i recall it did not work in my case. Long ago....