CDM-4/19 running at warpspeed

Pharao.Pharao · 2nd May 2008, 05:35 PM

Hi,

the CDM-4/19 of my Philips CD780/00R player runs at warm speed when I turn on the power switch of the player. Since I don´t have any service manual neither of the player itself nor of the CDM-4/19, can anybody here please advise where and how to start debugging?

Thanks a mil in advance!
P.

Audiofanatic · 2nd May 2008, 06:06 PM

Hi P,

If there is a SAA7220 or a SAA7345 in the player, than probably this is the culprit of the spinning CD.

Best regards,

Audiofanatic

Pharao.Pharao · 2nd May 2008, 08:15 PM

Hi there,

there is a SAA7220P/A and a SAA7210P in the player... . How to best diagnose whether the SAA7220P/A is the culprit one for the warp speed? I mean, I have just the datasheet of the SAA7220 in front of me and am looking for best practice diagnosis.

Thanks a mil again,
P.

SY · 2nd May 2008, 11:49 PM

From my digital guru:

"Tell this guy to check the '7220 for proper operation. It has the clock,
and if that chip does not work, the platter spins at warp speed."

Predator864 · 3rd May 2008, 09:15 AM

Look first at the TCA0372. If this are blown/shorted the CD will spin non stop.

Mooly · 3rd May 2008, 12:30 PM

Check ALL supplies first to all I/C,s. Might be a safety resistor gone high.

Pharao.Pharao · 4th May 2008, 08:23 PM

@Mooly: All supplies to all ICs look good. I am just done with measuring. Even all resistors look OK to me.

@Predator864: There is a TCA0372DP2 (Motorola) on the board. I even have the datasheet and started measuring. Hmm.. question: Would the CD spin counter-clockwise at overspeed when this TCA0372DP2 is blown/shorted?

@SY: The SAA7220 is absolutely OK from what I measured. And the SAA7110 shows a fixed 88.19 kHz signal on Pin 17 (MSC). This is good news, right?

@All: If anybody could share the Service Manual for the Philips CD780/00R with me, I could continue much more systematically. Your help is highly appreciated!

Any more hints on how to continue a bit more systematically? I would like to track down the 88.19 kHz signal from Pin 17 (MSC) of the SAA7220 a bit further, but I don´t have any schematic of the PCB of the CD player, so I am a bit lost at this moment.

Any advice you could give, please?

Predator864 · 4th May 2008, 09:14 PM

I blown a TCA0372 while measuring it. Then the CD began spinning like a madman.

Pharao.Pharao · 4th May 2008, 09:24 PM

@Predator864: Did the CD start spinning counter-clockwise after the TCA0372 was blown?

Predator864 · 4th May 2008, 09:26 PM

I dont know. Scared the crap out of me and unplugged it immediately.
I can clearly remember by shorting two pins of the IC the CD would spin in a direction, but again I dont know if it is CW or CCW.

2nd May 2008, 05:35 PM	#1
Pharao.Pharao diyAudio Member Join Date: Apr 2008	CDM-4/19 running at warpspeed Hi, the CDM-4/19 of my Philips CD780/00R player runs at warm speed when I turn on the power switch of the player. Since I don´t have any service manual neither of the player itself nor of the CDM-4/19, can anybody here please advise where and how to start debugging? Thanks a mil in advance! P.

2nd May 2008, 06:06 PM	#2
Audiofanatic diyAudio Member Join Date: Oct 2002 Location: The Netherlands, Utrecht	Philips Hi P, If there is a SAA7220 or a SAA7345 in the player, than probably this is the culprit of the spinning CD. Best regards, Audiofanatic __________________ Be nice to animals.

2nd May 2008, 11:49 PM	#4
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	From my digital guru: "Tell this guy to check the '7220 for proper operation. It has the clock, and if that chip does not work, the platter spins at warp speed." __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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2nd May 2008, 08:15 PM	#3
Pharao.Pharao diyAudio Member Join Date: Apr 2008	Hi there, there is a SAA7220P/A and a SAA7210P in the player... . How to best diagnose whether the SAA7220P/A is the culprit one for the warp speed? I mean, I have just the datasheet of the SAA7220 in front of me and am looking for best practice diagnosis. Thanks a mil again, P.

3rd May 2008, 09:15 AM	#5
Predator864 diyAudio Member Join Date: Mar 2008	Look first at the TCA0372. If this are blown/shorted the CD will spin non stop.

3rd May 2008, 12:30 PM	#6
Mooly diyAudio Member Join Date: Sep 2007	Check ALL supplies first to all I/C,s. Might be a safety resistor gone high.

4th May 2008, 08:23 PM	#7
Pharao.Pharao diyAudio Member Join Date: Apr 2008	@Mooly: All supplies to all ICs look good. I am just done with measuring. Even all resistors look OK to me. @Predator864: There is a TCA0372DP2 (Motorola) on the board. I even have the datasheet and started measuring. Hmm.. question: Would the CD spin counter-clockwise at overspeed when this TCA0372DP2 is blown/shorted? @SY: The SAA7220 is absolutely OK from what I measured. And the SAA7110 shows a fixed 88.19 kHz signal on Pin 17 (MSC). This is good news, right? @All: If anybody could share the Service Manual for the Philips CD780/00R with me, I could continue much more systematically. Your help is highly appreciated! Any more hints on how to continue a bit more systematically? I would like to track down the 88.19 kHz signal from Pin 17 (MSC) of the SAA7220 a bit further, but I don´t have any schematic of the PCB of the CD player, so I am a bit lost at this moment. Any advice you could give, please?

4th May 2008, 09:14 PM	#8
Predator864 diyAudio Member Join Date: Mar 2008	I blown a TCA0372 while measuring it. Then the CD began spinning like a madman.

4th May 2008, 09:24 PM	#9
Pharao.Pharao diyAudio Member Join Date: Apr 2008	@Predator864: Did the CD start spinning counter-clockwise after the TCA0372 was blown?

4th May 2008, 09:26 PM	#10
Predator864 diyAudio Member Join Date: Mar 2008	I dont know. Scared the crap out of me and unplugged it immediately. I can clearly remember by shorting two pins of the IC the CD would spin in a direction, but again I dont know if it is CW or CCW.

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