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Old 11th July 2003, 10:19 PM   #1
guido is offline guido  Netherlands
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Question cd 650 puzzle

Hi,

I am using my CD650 for I2S source and am not using the output anymore. Therefore i don't need the SAA7220, TDA1541 and opamps. Also the + and - 15V PS is redundant. So i have the plan to make a new design of the main PCB, with only the remaining PS, the SAA7210 and the microprocessor. I can then also put the display PS from the filter PCB onto the main PCB. Result: lots of room inside (well, a bit more..). And there is room for one more 7805, so the drive can get it's own PS. I also will put some fast optocouplers on there to separate dac from 7210, also for the clock back from dac to decoder.

So far, so good. I have an early version of the PS, the microprocessor is on a sub-PCB above the mainboard and the TDA1541 and SAA7220P/A look old: chips are grey-ish and no philips logo (datecode '86).

The SAA7210 is even more weird: it is not there! In it's place sits an M4804A (also marked 0041 and LHG8631). This would not be much of a problem if it would be a direct replacement. However, some components around it have different values than the schematics! Since the smd components are unmarked, i can only look at the normal stuff (i did not measure some yet).

Could someone report on the inside of their 650? I need to know if i have a really strange player, or that more are not according to the schematics. Since i can not read the SMD's, i would have a problem making a mix of the schematics and the stuff i am seeing. I have a real 7210 lying around and i could use this one with
the values of from the schematics. I would also be interested if someone would have the 7210 datasheet, if there are values in there. I only have an old book with some development data (going to google for it now).

Here we go:
pin 24, FB has a pol cap to gnd: value 1uF, but 2.2uF in schematics. At bottom of 7210 pin 22, PD/OC has cap to gnd: 220nF, but 270nF in schematics. MKT at bottom of 7210.
Also connected there is a resistor: 47 but 33 in schematics. Direct at bottom of 7210 Connected to the resistor is pol cap: 3.3uF but 6.8uF in schematics. At pin 20 of 7210. All are near the orange cap in the picture (the MKT).

I also have a 7310 in smd lying around, might even use that...

Thanks,

GuidoB (therefore not Guido T :->)!
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Old 11th July 2003, 10:22 PM   #2
guido is offline guido  Netherlands
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Smile picture....

camera in phone, does not work from nearby...

Anyway, around the orange cap at the bottom right

Thanx,

GuidoB
Attached Images
File Type: jpg 36am0014.jpg (95.6 KB, 939 views)
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Old 12th July 2003, 06:12 AM   #3
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The complete datasheet of the 7210

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Old 14th July 2003, 10:31 AM   #4
guido is offline guido  Netherlands
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Stefano,

That is NOT the complete datasheet, only the development data version. This is only a 'preview' of the real datasheet.

I saw that one before: you can download it from a russian site in pdf (only 700k then) and i already had this on paper (1988 databook). Never saw the full datasheet...

So to the others on the forum (Elso?), i know there are several cd650's out there. Could anyone have a look inside ??

Please?

Regards,
Guido
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Old 14th July 2003, 11:41 AM   #5
Netlist is offline Netlist  Belgium
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Guido
The M4804A has been used till a certain production date and then replaced by the SAA7210 for disc start-up problems. (from Philips data)
The data I have doesn't mention any modifications.
This means you could pull out the M4804A and replace it with the
SAA7210.

My .02

/Hugo
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Old 14th July 2003, 01:45 PM   #6
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Quote:
Originally posted by guido
Stefano,

That is NOT the complete datasheet, only the development data version. This is only a 'preview' of the real datasheet.
Regards,
Guido
Guido,
Thanks for the preciseness of your reply
BTW , in the page of the link above it is write-complete-
http://members.xoom.virgilio.it/hi_fi/quick.htm

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Old 17th July 2003, 01:16 PM   #7
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Default schematic for cd650

Guido,

Do you by any chance have the schematics for a cd650?

Jim.
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Old 22nd July 2003, 08:51 PM   #8
guido is offline guido  Netherlands
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You got mail!

For my question, is everybody on hols???

Help, still nobody who gave me some answers.

.........please......!!

GuidoB
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Old 22nd July 2003, 08:57 PM   #9
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Schematics? I probably still have them around... this is the Magnavox/Phillips CDB-650, right?

Also, if that is true, I have one heavily mod'd and one stock that I can examine/photograph.

Let me know what you need.

Greg in Minneapolis
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Old 22nd July 2003, 09:11 PM   #10
guido is offline guido  Netherlands
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Greg,

I also have the schematics, i have the complete (dutch..) servicemanual. My problem is that it does not match up with the components on the pcb...

SAA7210 => M4804

I must admit, my question is not clear. I'll try again:

SAAP7210, pin 24, FB has a pol cap to gnd: value 1uF, but 2.2uF in schematics. Number 2309 in the schematics.

At bottom of SAA7210 pin 22, PD/OC has cap to gnd: 220nF, but 270nF in schematics. Number 2310, MKT at bottom of SAA7210.

Also connected there is a resistor: 47 but 33 in schematics.
Direct at bottom of SAA7210 , number 3320.

Connected to the resistor is pol cap: 3.3uF but 6.8uF in schematics. At pin 20 of 7210. Number 3320.

All are near the orange cap in the picture (the MKT).
Hope this is a bit more clear!

Thanks!

BTW, if you have a look: is the microprocessor on a sub-pcb or not?? Do you have a M4804 or SAA7210?

Thanks again!
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