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Old 9th November 2005, 04:06 PM   #1
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Default 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
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Old 10th November 2005, 05:57 AM   #2
phimor is offline phimor  Australia
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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
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Old 10th November 2005, 01:48 PM   #3
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I am looking for two CDM1 units to restore two CDX players. Anyone have available units?

Thanks!

The Restorer in Ohio
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Old 11th November 2005, 12:26 AM   #4
phimor is offline phimor  Australia
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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
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Old 11th November 2005, 03:18 PM   #5
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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
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Old 11th November 2005, 06:03 PM   #6
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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)
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Old 11th November 2005, 07:15 PM   #7
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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
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Old 13th November 2005, 03:42 PM   #8
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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.
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Old 14th November 2005, 03:06 PM   #9
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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
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Old 28th December 2005, 03:33 PM   #10
Gasho is offline Gasho  Croatia
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How can i replace laser diode in laser optical assembly without using a force?
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