Philips CD850 MkII Modification? - diyAudio
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Old 30th September 2005, 05:48 PM   #1
eelekim is offline eelekim  Macao
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Unhappy Philips CD850 MkII Modification?

Hi all,

I've just got a used unit of Philips CD850 MkII. The appearance is excellent. But I'm wondering if it's been modified.

I'm certainly not an expect on CD player circuitry. I just opened the cover and saw whether there are any missing key components as mentioned in this Forum and other websites on the Internet.

All I can find are the following big black chips:

Philips PC74HCT373P
Philips PCB 83C654 P 026
Xicor X2816BP
Motorola ZC99827P

I can't find these:

TDA1541
LM833

Of course, I didn't check all the boards as I'm afraid to have problems after unscrewing boards out and putting them back on... :P

Please help to cure my worry by letting me know what the above found chips are used for in layman terms and where I can find those missing but significant chips.

Thank you very much in advance.

mike
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Old 30th September 2005, 08:38 PM   #2
eelekim is offline eelekim  Macao
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Um... I can find those small LM833's now. But where does the TDA1541 hide? Or is there no such chip in the MkII version? If so, what replaces it?
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Old 30th September 2005, 09:29 PM   #3
guido is offline guido  Netherlands
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Default Re: Philips CD850 MkII Modification?

It says bitstream on the cd drawer front if i'm not mistaken:
there is no 1541 but a smd bitstream dac underneith the pcb.

Not shure which one, maybe somebody has the manual.

As for the chips, they all seem to be for controlling the player, not for the audio part.
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Old 1st October 2005, 12:25 PM   #4
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Quote:
Originally posted by eelekim
Um... I can find those small LM833's now. But where does the TDA1541 hide? Or is there no such chip in the MkII version? If so, what replaces it?

the cd850mk2 has no TDA1541. the initial version has the tda1541.
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Old 1st October 2005, 03:48 PM   #5
eelekim is offline eelekim  Macao
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yes, guido, it's Bitstream. i've just got the service manual. confirmed there is no TDA1541 as in CD850. i've been too stupid to suppose they use the same DAC.

guido, you're right too that the DAC is underneath the PCB. it's decoder SAA7310. No wonder I can't find it only with the top cover opened... :P

from the service manual, i have more ideas about those found chips now. thanks a lot for your response, guido.

but i have a question, guido, what does "smd" stand for?

thanks to commstech too! you double confirmed one of the differences between CD850 and CD850 MkII!

who can point out more differences other than the above and the following mentioned by a user of this Forum?

CD850's THD apparently rises to very high levels the lower the output signal is - a faulty filter apparently. CD850II should have a fix on this issue.

mike
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Old 1st October 2005, 03:55 PM   #6
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Quote:
Originally posted by eelekim


but i have a question, guido, what does "smd" stand for?


surface mounted device, i suppose.
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Old 2nd October 2005, 02:14 AM   #7
TDA1540 is offline TDA1540  Netherlands
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Quote:
the cd850mk2 has no TDA1541. the initial version has the tda1541
that one was a bitstreamer as well.......
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Old 2nd October 2005, 02:40 AM   #8
Fin is offline Fin
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Quote:
Originally posted by TDA1540


that one was a bitstreamer as well.......

You are right again, TDA! The original CD850 has two SAA7321 chips for the DAC. The CD850MKii has one SAA7322 as a filter and one SAA7350 as the DAC. The CD850Mkii is very similar to the Marantz CD62 (and Arcam used a similar approach in the Delta 70.3). The original CD850 has no counterpart in the Marantz range.
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Old 3rd October 2005, 03:27 AM   #9
eelekim is offline eelekim  Macao
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Thanks, Arcamaniac, for pointing out clearly the DAC of CD850II! I had another mistake to say it is SAA7310... :P

Btw, where can I learn more about the different chips and get the general knowledge of digital format and know how it works in CD player on the Internet? Any weblinks are welcome!
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Old 3rd October 2005, 03:27 AM   #10
eelekim is offline eelekim  Macao
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Anyone knows the brandname of this LM833N in my CD850II? I think it's not Motorola...
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