Extending Philips CDM4 Life??

[Rodzilla]

ok pics coming up..i apologize for the poor quality...the only cam i have on hand right now is a webcam...i tried my best the model # on this philips machine is "cdd462 cdrom multisession"

first up the label on the transport-

 

[Rodzilla]

the whole transport...as i said it looks pretty normal

 

[Rodzilla]

the board it's attached to has some odd thing's...anyone ever see one of these before?...it's a motorola sourced chip,socketed,that's the tda1543 dac just behind it

 

[Rodzilla]

or what about this???another motorola a servo this time...

 

[lambo]

CDM4/25 Repair - 33ufd cap issue?

Hi,

I'm new to this forum since purchasing a faulty Micromega F1 Pro which won't read CD's. Everything seems to work OK except the final read.

I've taken it apart to find a CDM4/25 mechanism. Now I'm wondering if replacing the 33ufd cap (as mentioned in this forum) will work bring it to life again. I hope so!

As I'm new to this, can anyone submit a picture showing which cap needs replacing? Or give a description of where it is? I've spotted one blue cap with the markings that looks like a possibility. The marking are:

W6
33u
16v
Philips
030K0 - this could be 039K0

Also, what type should I be using as a replacement?

Any help will be much appreciated.

Thanks.

 

[tubenut]

Look for a cap of 33 or 47 mfd near the 22K and 4K7 trimpots, typically below the laser mech/loader. Use a fresh electrolytic cap of same value... Typically these are axial caps.

 

[Family_Dog]

Hi Guillaume,

Were you able to solve your original problem? Was this 33uF cap the cause of it?

-Eric

 

[tubenut]

Nope, on my one player the laser was dead... The other had a good laser on a bad board and I suspect it was the cap on laser supply. Friend solved same symptoms that way on a player of his (CD850).
I just ended up using the good laser in the good PCB.....

G

 

[riccardo]

Re: CDM4 laser prob

Hi! I repaired a B&O CD5500 version 2 (CDM4) once with the identical lowering of sampling test voltage after a few minutes. Turned out the 33ufd axial cap in the laser supply servo board was on the way out. After replacement the machine has worked flawlessly for the client with an excellent 50mv center of disc laser sample. This has been 5 years now. I've seen many CDM2 with this identical problem.

Anthony Garza
Beomuse.com

Hello.
I would know,if it's possible, the position of the 33 uF cap.
I think it couid be:
the servo decoder supply are the pin 17 and 18 of TDA8808 for Philips marantz, especially CD40, it's right?
And so the cap could be directly connetted between pin 17, and through a R, to BC388.
So it coul be in front of PCB, just below CDM and close to CHIP philips pcb code 6500.
Could be right?
Ciao
RR

 

[ernesternest]

Hi! I repaired a B&O CD5500 version 2 (CDM4) once with the identical lowering of sampling test voltage after a few minutes. Turned out the 33ufd axial cap in the laser supply servo board was on the way out. After replacement the machine has worked flawlessly for the client with an excellent 50mv center of disc laser sample. This has been 5 years now. I've seen many CDM2 with this identical problem.

Anthony Garza
Beomuse.com

Thanks for the advice! Helped to cure my Grundig CD8400

Ernst

 

[Beacon64]

Hi. This is an old thread but I've just got hold of a Cd5500 at a good price as it was faulty. My first instinct was that the laser was faulty. I checked the laser type, and found that B&O had installed a CMD-4/13, as opposed to the CMD2 or CMD4/11 variant. As chance had it, I had a spare laser and was about to swap them out when I remembered the tip about the servo laser power supply capacitor. I downloaded the schematic from Hi-fi engine, which is a good source for free service manuals . The offending capacitor was identified as 33uF C2103. I clipped it out and replaced it with 100uF cheap'n'nasty. It fired up straight away! I'll replace it tomorrow with a Rubycon, but full marks to Beomuse! One IOU

 

[AndrewGM]

Don't hear many good luck stories like that one too often !
Lucky you - well done.

I tend to remember good tips after I've ruined something

 

[JonHarrison]

Oscons are good for the laser supply too !

 

[Beacon64]

Thanks for the comments, lads. Yup, Christmas came early this year! I'll try the Oscon tip, Jon, I've got some stashed for a rainy day!

 

[JonHarrison]

To be more specific I changed C2103 the laser supply decoupling capacitor on a CDM4/25 pcb with a 47uF/16V Sanyo Oscon (standard / SC series)

 

[Beacon64]

Jon, thanks. I've got the very thing in my box of tricks.

 

[tjc123057]

I know this is a very old thread but I had to thank you all for the fix on CDM 4 pro. My Krell MD 10R quit reading disks. I actually bought a replacement laser head from Germany and installed. Still didn't work. I was in a panic. Found this site and replaced 33uf 16v cap, and all remaining 21 caps. Works great now. Thank you all so much for posting this. I love my Krell. It is an awesome transport. And now works and sounds like new.

 

[NATDBERG]

Can anyone list or point me to a list of capacitors for the cdm 4 control board? I'm putting an order together, need to order more things for the free postage and not at home to check... (Is for a Meridian 602 ) cheers in advance!