Help! CDP Philips CD-204

kevin2059 · 3rd April 2005, 02:17 PM

My Philips CD-204 have a big problem : Transport always rotating when CDP power on , and can`t read any CD.
I adjust cdm-1 foucs gain/offset & laser output VR but no useful!
Is cdm-1 laser head fail?
How to do further trouble shooting?
Please help me! Thank you!

Giaime · 3rd April 2005, 04:08 PM

I've seen this in many PC cd-roms. It is usually linked to the faliure of the +5V regulator that's feeding the motor control circuits. Most of the time it isn't repairable because usually the chip that controls the motor is fried and not easy to obtain.

TDA1540 · 3rd April 2005, 09:00 PM

It's a problem that occurs often.
(in my experience) It is always cured with a blanket replacement of electrolytes together with new regulators and a check for dry solderjoints.

You can spend weeks,checking opamps and chips etc,but the above will probably be enough..
Start with checking the soldering.This is cheap and often does the trick.also add a wire between the groundplanes near the microprocessor on the servopcb.

Once again,a working cdm0 or cdm1 is not likely to deteriorate overnight.Uptil now,I have mainly encountered dead lasers in players that had been "modified".
In 12 years of 14bit addiction,I have once (!) seen a player that had certainly worn out it's laser.The rest had been killed by an ESD.

3rd April 2005, 02:17 PM	#1
kevin2059 diyAudio Member Join Date: Apr 2004 Location: Taipei	Help! CDP Philips CD-204 My Philips CD-204 have a big problem : Transport always rotating when CDP power on , and can`t read any CD. I adjust cdm-1 foucs gain/offset & laser output VR but no useful! Is cdm-1 laser head fail? How to do further trouble shooting? Please help me! Thank you!

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3rd April 2005, 04:08 PM	#2
Giaime diyAudio Member Join Date: Oct 2004	I've seen this in many PC cd-roms. It is usually linked to the faliure of the +5V regulator that's feeding the motor control circuits. Most of the time it isn't repairable because usually the chip that controls the motor is fried and not easy to obtain.

3rd April 2005, 09:00 PM	#3
TDA1540 diyAudio Member Join Date: Feb 2004 Location: Ehv	It's a problem that occurs often. (in my experience) It is always cured with a blanket replacement of electrolytes together with new regulators and a check for dry solderjoints. You can spend weeks,checking opamps and chips etc,but the above will probably be enough.. Start with checking the soldering.This is cheap and often does the trick.also add a wire between the groundplanes near the microprocessor on the servopcb. Once again,a working cdm0 or cdm1 is not likely to deteriorate overnight.Uptil now,I have mainly encountered dead lasers in players that had been "modified". In 12 years of 14bit addiction,I have once (!) seen a player that had certainly worn out it's laser.The rest had been killed by an ESD.

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