Mystery chip....?

cdl · 4th November 2003, 01:23 PM

Hi!

My CDP has a chip that I can't really figure out what's doing.

It is a Philips chip with 44 pins and is marked:
QC8868HP
K5D770CA

Can't find data sheets anywhere or anything. Has anyone got a clue? help appreciated!

b.t.w. it is not the DSP, there's an SAA7345 in there too; and probably not the dac as there's also a TDA1305.

/cdl

CheffDeGaar · 4th November 2003, 02:17 PM

I would say it's a controller. Where is it located, near the drive, or on the display/buttons board ?

Just my 2 cents

Netlist · 4th November 2003, 02:22 PM

We might find something if you give us the model nr. of the player (on the backside) and the position number of the chip on the pcb.

/Hugo

janneman · 4th November 2003, 02:25 PM

Sounds to me like the controller indeed. How old is that player? Could be a derivative of the 8800 or 6800 microcontroller series that were used by Philips before they switched over to 8050 series.

Jan Didden

cdl · 5th November 2003, 07:06 AM

Hi Guys, ta for the responses!!!

First of all, my apologies, the chip is labeled
OQ8868HP and not QC as I stated earlier. Damn that small writing... needed a magnifying glass to see the text clearly.

Which makes stuff easier... I found out what it is! It's the "digital servo" apparently for the laser mechanism of the transport (CDM 12.4)!

It IS puzzling that a search for "*8868*" on the Philips Semiconductors site didn't return any useful hits... must be a lousy search engine!

So maybe I should get better glasses

On the other hand, nothing is wasted - your responses prompted me to have a closer look at the fellow with a magnifying glass, and whilst doing this I:
1) found out what the actual markings of the chip were a.s.o.
2) discovered a resistor I must have fried while installing the Elso's clock (my own fault

, NOT Elso's

)

So thanks - this forum really is a great place!

Cheers!

4th November 2003, 01:23 PM	#1
cdl diyAudio Member Join Date: Aug 2003 Location: Copenhagen	Mystery chip....? Hi! My CDP has a chip that I can't really figure out what's doing. It is a Philips chip with 44 pins and is marked: QC8868HP K5D770CA Can't find data sheets anywhere or anything. Has anyone got a clue? help appreciated! b.t.w. it is not the DSP, there's an SAA7345 in there too; and probably not the dac as there's also a TDA1305. /cdl

4th November 2003, 02:17 PM	#2
CheffDeGaar diyAudio Member Join Date: Feb 2003 Location: This Universe, I think	I would say it's a controller. Where is it located, near the drive, or on the display/buttons board ? Just my 2 cents __________________ /Cheff - Falling feels like flying, until you hit the ground

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4th November 2003, 02:22 PM	#3
Netlist diyAudio Moderator Join Date: Jan 2003	We might find something if you give us the model nr. of the player (on the backside) and the position number of the chip on the pcb. /Hugo

4th November 2003, 02:25 PM	#4
janneman diyAudio Member Join Date: May 2002 Location: Where Germany, The Netherlands and Belgium meet Blog Entries: 6	Sounds to me like the controller indeed. How old is that player? Could be a derivative of the 8800 or 6800 microcontroller series that were used by Philips before they switched over to 8050 series. Jan Didden

5th November 2003, 07:06 AM	#5
cdl diyAudio Member Join Date: Aug 2003 Location: Copenhagen	Hi Guys, ta for the responses!!! First of all, my apologies, the chip is labeled OQ8868HP and not QC as I stated earlier. Damn that small writing... needed a magnifying glass to see the text clearly. Which makes stuff easier... I found out what it is! It's the "digital servo" apparently for the laser mechanism of the transport (CDM 12.4)! It IS puzzling that a search for "8868" on the Philips Semiconductors site didn't return any useful hits... must be a lousy search engine! So maybe I should get better glasses On the other hand, nothing is wasted - your responses prompted me to have a closer look at the fellow with a magnifying glass, and whilst doing this I: 1) found out what the actual markings of the chip were a.s.o. 2) discovered a resistor I must have fried while installing the Elso's clock (my own fault , NOT Elso's ) So thanks - this forum really is a great place! Cheers!

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