Laser in CDM1

diyman · 9th November 2005, 03:06 PM

For the Philips CD960, is the laser diode supposed to be on all the time or only when it plays a disc??

ckt

phimor · 10th November 2005, 04:57 AM

Hi,
I don't know the exact model you refer to, but I have about 10 players with the CDM0/1 pick up, and they all shut down the laser if there is no disk. Also when not spinning.

Cheers

Philippe

Terry Keith · 10th November 2005, 12:48 PM

I am looking for two CDM1 units to restore two CDX players. Anyone have available units?

Thanks!

The Restorer in Ohio

phimor · 10th November 2005, 11:26 PM

Hi Terry,

sorry none of mine are available for parts (they all work - they did not when I got them).

Try
http://www.ersatzteil.justone-schnep...gallerie1.html

Also I have seen some on German ebay sites.

I assume you have tried replacing the 33uf caps already?.

Cheers

Philippe

Terry Keith · 11th November 2005, 02:18 PM

I have swapped out the CDM1 boards with the components on them to another CDM1 assembly and they do work.

I am in search of replacement laser diodes for the light pin tube.
This particular diode is a three pin type with a grounded case similar to an older type metal case transistor with a small orientation tab near the pin that's grounded to the case.

Thanks for the site url you sent. The pictures are great, but I don't read German!

Another gentleman was pursuing replacement laser diodes on this site earlier this year and said he'd found some and had them on order, but I have not been able to locate his followup post - if it exists.

I believe I have a process for removing the old diode and replacing it with a new one if I can get some NOS or replacment diodes of the correct type.

Cheers,

Restorer

Silver Eagle · 11th November 2005, 05:03 PM

IMHO, most old Philips CD player's laser diode can output sufficient power, but photo diodes have problems.

So, maybe you can check photo diodes first.
Or check Servo loops. (Focus and Radial control)

Terry Keith · 11th November 2005, 06:15 PM

Do you mean the chip assembly that is glued to the radial arm?

The 8 Pin chip that has the flex cable attached?

TK in Ohio

Silver Eagle · 13th November 2005, 02:42 PM

Yes. The 8 Pin chip contants photo diodes.

If you de-solder the flex cable, you will find a small window under the chip, and you can see the die.

I tried many times to fix damaged CDM-1 laser pick-up.
Never success!

But I notice most laser diode can output sufficient power.
So, I think it must be something worng elsewhere.

Terry Keith · 14th November 2005, 02:06 PM

Thanks for the information!

I have confidence that CDM1 units can be successfully restored with a combination of skill, patience, ingenuity, and collaboration!

Best Regards,

Restorer in OHIO

Gasho · 28th December 2005, 02:33 PM

How can i replace laser diode in laser optical assembly without using a force?

9th November 2005, 03:06 PM	#1
diyman diyAudio Member Join Date: Nov 2001 Location: Malaysia	Laser in CDM1 For the Philips CD960, is the laser diode supposed to be on all the time or only when it plays a disc?? ckt

10th November 2005, 12:48 PM	#3
Terry Keith diyAudio Member Join Date: Jun 2005 Location: Columbus, Ohio	I am looking for two CDM1 units to restore two CDX players. Anyone have available units? Thanks! The Restorer in Ohio __________________ The Restorer

11th November 2005, 02:18 PM	#5
Terry Keith diyAudio Member Join Date: Jun 2005 Location: Columbus, Ohio	I have swapped out the CDM1 boards with the components on them to another CDM1 assembly and they do work. I am in search of replacement laser diodes for the light pin tube. This particular diode is a three pin type with a grounded case similar to an older type metal case transistor with a small orientation tab near the pin that's grounded to the case. Thanks for the site url you sent. The pictures are great, but I don't read German! Another gentleman was pursuing replacement laser diodes on this site earlier this year and said he'd found some and had them on order, but I have not been able to locate his followup post - if it exists. I believe I have a process for removing the old diode and replacing it with a new one if I can get some NOS or replacment diodes of the correct type. Cheers, Restorer __________________ The Restorer

11th November 2005, 06:15 PM	#7
Terry Keith diyAudio Member Join Date: Jun 2005 Location: Columbus, Ohio	Do you mean the chip assembly that is glued to the radial arm? The 8 Pin chip that has the flex cable attached? TK in Ohio __________________ The Restorer

14th November 2005, 02:06 PM	#9
Terry Keith diyAudio Member Join Date: Jun 2005 Location: Columbus, Ohio	Thanks for the information! I have confidence that CDM1 units can be successfully restored with a combination of skill, patience, ingenuity, and collaboration! Best Regards, Restorer in OHIO __________________ The Restorer


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10th November 2005, 04:57 AM	#2
phimor diyAudio Member Join Date: Feb 2004 Location: Adelaide	Hi, I don't know the exact model you refer to, but I have about 10 players with the CDM0/1 pick up, and they all shut down the laser if there is no disk. Also when not spinning. Cheers Philippe

10th November 2005, 11:26 PM	#4
phimor diyAudio Member Join Date: Feb 2004 Location: Adelaide	Hi Terry, sorry none of mine are available for parts (they all work - they did not when I got them). Try http://www.ersatzteil.justone-schnep...gallerie1.html Also I have seen some on German ebay sites. I assume you have tried replacing the 33uf caps already?. Cheers Philippe

11th November 2005, 05:03 PM	#6
Silver Eagle diyAudio Member Join Date: Jun 2003 Location: Taiwan	IMHO, most old Philips CD player's laser diode can output sufficient power, but photo diodes have problems. So, maybe you can check photo diodes first. Or check Servo loops. (Focus and Radial control)

13th November 2005, 02:42 PM	#8
Silver Eagle diyAudio Member Join Date: Jun 2003 Location: Taiwan	Yes. The 8 Pin chip contants photo diodes. If you de-solder the flex cable, you will find a small window under the chip, and you can see the die. I tried many times to fix damaged CDM-1 laser pick-up. Never success! But I notice most laser diode can output sufficient power. So, I think it must be something worng elsewhere.

28th December 2005, 02:33 PM	#10
Gasho diyAudio Member Join Date: Nov 2004 Location: Zagreb	How can i replace laser diode in laser optical assembly without using a force?

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