M4804A in CD304mk2

tubee · 30th January 2006, 06:08 PM

Hello all

I have a Philips CD304mk2, and opened it because the servo wasn't working anymore. Fixed the servo allready, a bad connection.
But when i checked the chipset, discovered a 40 pin SAA7210-like chip but with another stamping on it: "M4804A"

I was suprised of this because the other chips was of the standard 16 bit stuff: SAA7220, TDA1541(plain), a RAM, and a 74/74 for dig out. Btw, most of all are produced year '86.

So: is the M4804A a pre-7210 or is it another decoder-chip?

ash_dac · 30th January 2006, 06:14 PM

Hi,

I've got one of them Mxxx chips in my Mission PCM7000.

It had a tda1541 from 1986!

http://www.diyaudio.com/forums/showt...051#post206051

Cheers,

Ashley.

drews · 30th January 2006, 08:22 PM

I have problem with cd 304mkII. It has disc start-up problems.
When I press start the CD begins to turn around, but the arm of the laser does not move. It could be a problem of Servo (M4814A)?
Is it possible replace it with cs8412cp?

Many thanks
Andrea

tubee · 31st January 2006, 02:43 PM

Thanks Ashley, its obvious now: my search here was not thourough enough.

So the M4804 is a pre 7210, with its problems: In post 5 is a comment of starting problems with 4804: My 304 is indeed not a quick starter compared to my newer ('87?) CD640 and 660.

Quote:

Is it possible replace it with cs8412cp?

Drews: the 8412 is a (SPdif) receiver and has really nothing to do with the function of Saa7210/M4804.

Quote:

but the arm of the laser does not move.

Does the laser light up? If so the servo doesn't get power, check the red connector (4th from left above on servo pcb) for a bad connection. I had a faulty one also.

If the connection is allright, there is more wrong. Then you need a service manual and search it all out.

drews · 4th February 2006, 10:29 AM

Thanks Tubee,

I have check allthings but I don't solv the problem....
Do you know where I can founf the service manual??

Bye
Andrea

tubee · 4th February 2006, 05:00 PM

http://user.planetaclix.pt/

If you can read dutch! But schematics are internationally readable i guess. Choose CD304 as mkII not available, but the 304 has same CDM and servo pcb as MKII's, even partnumbers are the same.

30th January 2006, 06:08 PM	#1
tubee diyAudio Member Join Date: Jul 2004 Location: Netherlands	M4804A in CD304mk2 Hello all I have a Philips CD304mk2, and opened it because the servo wasn't working anymore. Fixed the servo allready, a bad connection. But when i checked the chipset, discovered a 40 pin SAA7210-like chip but with another stamping on it: "M4804A" I was suprised of this because the other chips was of the standard 16 bit stuff: SAA7220, TDA1541(plain), a RAM, and a 74/74 for dig out. Btw, most of all are produced year '86. So: is the M4804A a pre-7210 or is it another decoder-chip? __________________ Daisy Bell

4th February 2006, 05:00 PM	#6
tubee diyAudio Member Join Date: Jul 2004 Location: Netherlands	http://user.planetaclix.pt/ If you can read dutch! But schematics are internationally readable i guess. Choose CD304 as mkII not available, but the 304 has same CDM and servo pcb as MKII's, even partnumbers are the same. __________________ Daisy Bell

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30th January 2006, 06:14 PM	#2
ash_dac diyAudio Member Join Date: Jan 2005 Location: UK	Hi, I've got one of them Mxxx chips in my Mission PCM7000. It had a tda1541 from 1986! http://www.diyaudio.com/forums/showt...051#post206051 Cheers, Ashley.

30th January 2006, 08:22 PM	#3
drews diyAudio Member Join Date: Jan 2005 Location: Roma	I have problem with cd 304mkII. It has disc start-up problems. When I press start the CD begins to turn around, but the arm of the laser does not move. It could be a problem of Servo (M4814A)? Is it possible replace it with cs8412cp? Many thanks Andrea

4th February 2006, 10:29 AM	#5
drews diyAudio Member Join Date: Jan 2005 Location: Roma	Thanks Tubee, I have check allthings but I don't solv the problem.... Do you know where I can founf the service manual?? Bye Andrea

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