Restoring Philips CD players that use CDM-2 & CDM-4 transports

[tiefbassuebertr]

from the CDM-4 there are several variantes - except the CDM-4/19 there are some versions with sometimes integrated servo board. This is still the case, as long on the cover sheet of the according service manual the following mentioned
"for service on the CD-mechanism and servo PCB please refer the service Manual for CDM-2/xxx"

According the DAC/mechanism list from vasiltech the CDM-4/25 is in use in later versions of the Philips models CD460, CD560 and CD650 so as the Marantz models CD56 and CD75 (also later versions), and the significantly widened mechanism CDM-4/11 among various other in the Philips Models CD660 and CD670 (both with extra servo board) and numerous other models without extra servo board.

I happened to find the following advice while browsing through numerous Philips service manuals (go also to the PDF attachment) :

CDM-4 information and information of adaptations (means probably CDM-2 replacement and servo board modification steps) have been added to the manual of the sets

What means here the marked term (resp. where are to find the CDM-4 supplements) ?

 

[huggygood]

I have this lying around in my archives, I've never gone around, I'm sure there's some interesting information, I'll let you look at it with a clear head, you'll tell me.

https://www.reeltoreel.nl/Philips-repair-database.html

 

[jackytah]

from the CDM-4 there are several variantes - except the CDM-4/19 there are some versions with sometimes integrated servo board. This is still the case, as long on the cover sheet of the according service manual the following mentioned
"for service on the CD-mechanism and servo PCB please refer the service Manual for CDM-2/xxx"

According the DAC/mechanism list from vasiltech the CDM-4/25 is in use in later versions of the Philips models CD460, CD560 and CD650 so as the Marantz models CD56 and CD75 (also later versions), and the significantly widened mechanism CDM-4/11 among various other in the Philips Models CD660 and CD670 (both with extra servo board) and numerous other models without extra servo board.

I happened to find the following advice while browsing through numerous Philips service manuals (go also to the PDF attachment) :

CDM-4 information and information of adaptations (means probably CDM-2 replacement and servo board modification steps) have been added to the manual of the sets

What means here the marked term (resp. where are to find the CDM-4 supplements) ?

Hi brother , my Philips cd850 ,spindle motor spinning non stop when power on on, how to solve the problem,any helps appreciate 🙏. Thanks

 

[tiefbassuebertr]

Hi brother , my Philips cd850 ,spindle motor spinning non stop when power on on, how to solve the problem,any helps appreciate 🙏. Thanks

check disc motor resp. spindle motor driver stage in the associated service manual - but this question is filed wrong.
Please post the question in one of this threads (dependent, whether your version is the old or MK-II version):
https://www.diyaudio.com/community/threads/philips-cd850-help.53033/
https://www.diyaudio.com/community/threads/philips-cd850-mk1-skipping-on-some-cds.322607/
https://www.diyaudio.com/community/threads/help-with-faulty-philips-cd850-mkii.206390/

 

[tiefbassuebertr]

I have this lying around in my archives, I've never gone around, I'm sure there's some interesting information, I'll let you look at it with a clear head, you'll tell me.

https://www.reeltoreel.nl/Philips-repair-database.html

interesting URL - thank you therefore. Also of interest are this threads:
https://www.diyaudio.com/community/threads/philips-cdms-and-servicenrs.21493/ (associated Philips order codes "4822 691 xxxxx" for most CDM mechanism)
https://www.diyaudio.com/community/threads/what-dacs-and-mechanics.29889/
https://web.archive.org/web/20040605110226/http://gosfiles.hit.bg/CDM_Edum.txt

 

[tiefbassuebertr]

concerning various CDM-4 variants and difference between CDM-4/25 and CDM-4/11 check out #12+13 under
https://www.diyaudio.com/community/threads/cdm-4-11-vs-cdm-4-19.84900/

 

[tonydc]

Dear folks, (just joined, 7Jun22). I own a Maganavox CDB650 CD player (purchased new, ~1986/'87), with little use over the years. Recently, I've tried to fix a soft high freq 'whining' noise I hear (only) when advancing from track 2 to #3 & beyond (ex: advance w/up button from track #2 to #3 brings on the 'whining', that stays on for rest of CD disc). It plays nice & quietly if one lets CD run from start to finish by itself (no skipping). But queing up from track #2 to #3, to #4, etc, it begins to emit a soft 'whining' high freq noise that continues to end of CD. ('Whining' does not interfere with music & does not skip nor stop). This improves with player on time (stand by) as player warms (noise comes on when queing up from, say track #4 or 5 to #6, or #6 to #7). I have replaced the electrolitic caps on the CDM board under the motor/laser assembly. I've reset the laser power to spec (50mV+/= 5mV) [¡was at ~68mV from factory!]. I've tried adjusting the hall effect controlled spindle motor pot (10K ohm range) to no avail. (Left it mid way, ~5K ohm from 3.28K ohm orig setting). Don't know what to do next. Don't have a scope to view the eye pattern, nor the shape of the drive voltage curves for the spindle motor. Any/all suggestions most welcomed. I posted here, as I see this thread deals with similar machines. Thank you very much.

 

[tiefbassuebertr]

How many different RAFOC units are exist for the CDM-4 variants ?

there are some suppliers for CDM-1/MKII, CDM-2 and CDM-4 RAFOC units without base and Motor (for replacement)
https://www.ebay.com/itm/253203941142?hash=item3af4218716:g:6IwAAOxyyjpRuDq3
https://www.ebay.com/itm/263453652935?hash=item3d570fb7c7:g:8BUAAOSwMEtaZl3o
https://www.ebay.com/itm/253313125608?hash=item3afaa38ce8:g:YpsAAOSwICpaMteh
https://www.ebay.com/itm/325171597838?hash=item4bb5bcd20e:g:ON4AAOSwhaNgW6a~
https://www.ebay.com/itm/262988755466?hash=item3d3b59f20a:g:inEAAOxyzfNRuDQ1

in the service manuals and under
https://web.archive.org/web/20040605110226/http://gosfiles.hit.bg/CDM_Edum.txt
are not mentioned the order codes for RAFOC unit itself.
There is mentioned only the order codes of the completely mechanism, i. e. with base and with disc motor resp. spindle motor - see below.
How do I find out which other CD player models with CDM-4/xx these RAFOC units from ebay are still suitable for?
Thanks for an advice.

From Service-Manual CDM2:
CDM2/0000+0300 4822 691 30188 (+ Servo PCB)
CDM2/0001+0301 4822 691 30191 (+ Servo PCB)
CDM2/0003+0303+307 4822 691 20428
CDM2/0008 4822 691 30193
CDM2/0407 4822 691 30196
CDM2/0414 4822 691 30201

From Service-Manual CDM2/0500:
CDM2/0503 4822 691 30204 (new, magn. disc hold down, later replace by cdm4/??, 4822 691 20205)
CDM2/0501 4822 691 30193 (old, short legs mech. disc hold down, later replace by cdm4/11, 4822 691 20464)

from https://web.archive.org/web/20040605110226/http://gosfiles.hit.bg/CDM_Edum.txt
cdm1 4822 691 30221
cdm1 mk2 4822 691 20449
CDM2/150 4822 691 30212 ~CDM4/11
CDM2/29=CDM2-160 4822 691 30211 =cdm2-301 =cdm4/25 ~CDM4/28
CDM2-407 4822 69130207
cdm4/11 4822 691 20464
cdm4/16 4822 691 30213 (Grundig CD903/CD8400MKII: 59722-002 00)
cdm4/18 4822 691 30229 cdm4 vert mini
cdm4/19 4822 691 30209
cdm4/20 4822 691 30215
cdm4/?? 4822 691 20205
cdm4/21 4822 691 30206
cdm4/25 4822 691 30211 = CDM4/11 but legs different
CDM4/28 4822 691 30212
cdm4/31 4822 691 30224
cdm4/36 4822 691 30233 = CDM4/19 in die cast/metal
CDM4/36 4822 691 30276 according SM Marantz CD10
CDM4/38 4822 691 30193
cdm4/52 4822 691 30252
cdm4/55 4822 691 20779
CDM4/64 4822 691 30286

 

[tonydc]

Those different variations will be good to see.

I really don’t know how much the Mission PCM4000 I’m working on right now differs from the Philips model it is based on. The only section that looks really “non-Philips” is the front panel display and it’s associated PC board. Mission uses a rather elaborate VFD display. I don’t recall anything like that on Philips machines.

-EB

Your Mission PCM4000's Drive assembly PWB looks identical to my Magnavox CDB650's. As you can see, the factory's assembly of the 2nd 47Uf cap (lower left pair, lower of the two) is installed backwards in polarity. I corrected this when replacing them with Nichicoms (47uf/35V).

 

[tonydc]

"Würth" named capacitors are relatively new. They have a fancy appearance.
If you ask me, they just rely on the German name.
I would not use them, I only trust Japanese brands, and there only Panasonic, Rubycon, Nichicon and Nippon ("United" in the US) Chemi-Con. If I buy new electrolytics, I only take Panasonic FC, FM, FR. They have an unmatched track record for us hobbyists. The company I'm working for uses mostly Rubycon caps in the area >63volts and Nippon Chemicon <63volts. Our products are rated for 20yrs of usage (PV inverters).
I just recall Würth as a company that sells screws, nuts & bolts. Not a company that has a reputation in electronics, although they seem to have bought up some named companies in the inductor branch.

Btw - there is one french company, I do not recall the name, that I was told that produces the best electrolytic capcitors in the world.
Edit: is SIC-SAFCO / FELSIC. military and high reliability stuff... stick with the named japanese brands.

Hi. Please forgive my intrusion. Kindly, I had a question, and posted it at the end of this thread. But I think I'd like to send it to you directly, perhaps you can help me, if you are amenable. Here it is:
Dear folks, (just joined, 7Jun22). I own a Maganavox CDB650 CD player (purchased new, ~1986/'87), with little use over the years. Recently, I've tried to fix a soft high freq 'whining' noise I hear (only) when advancing from track 2 to #3 & beyond (ex: advance w/up button from track #2 to #3 brings on the 'whining', that stays on for rest of CD disc). It plays nice & quietly if one lets CD run from start to finish by itself (without skipping or stopping). But queing up (generally) from track #2 to #3, or #2 to #4, or #2 to 5, etc, it begins to emit a soft 'whining' high freq noise that remains to end of CD. (Said 'whining' does not interfere with music & does not skip nor stop). This seems to improve a little with player on time (stand by, ~2-4 hrs) as player warms (noise comes on when queing up to later tracks (> 4, 5, or 6). Also, when fast forwarding ('search') (from track #1) into the next few tracks, the noise does not appear. I've replaced electrolytic caps on the CDM board under the motor/laser assembly. I've reset the laser power to spec (50mV+/= 5mV) [¡was at ~68mV from factory!] This improved the situation only a little, as the onset is into later tracks, (as one queues forward to them). I've tried adjusting the hall effect controlled spindle motor drive pot (10K ohm range) to no avail. (Left it mid way, ~5K ohm from 3.28K ohm orig setting [10K Ohms pot]). Don't know what to do next. Don't have a scope to view the eye pattern, nor the shape of the drive voltage curves for the spindle motor. Any/all suggestions most welcomed. I posted here, as I see this thread deals with similar machines. Thank you very much. tonydc\.

 

[tiefbassuebertr]

Hi. Please forgive my intrusion. Kindly, I had a question, and posted it at the end of this thread. But I think I'd like to send it to you directly, perhaps you can help me, if you are amenable. Here it is:
Dear folks, (just joined, 7Jun22). I own a Maganavox CDB650 CD player (purchased new, ~1986/'87), with little use over the years. Recently,

I've tried to fix a soft high freq 'whining' noise I hear (only) when advancing from track 2 to #3 & beyond (ex: advance w/up button from track #2 to #3 brings on the 'whining', that stays on for rest of CD disc). It plays nice & quietly if one lets CD run from start to finish by itself (without skipping or stopping).

But queing up (generally) from track #2 to #3, or #2 to #4, or #2 to 5, etc, it begins to emit a soft 'whining' high freq noise that remains to end of CD. (Said 'whining' does not interfere with music & does not skip nor stop).

This seems to improve a little with player on time (stand by, ~2-4 hrs) as player warms (noise comes on when queing up to later tracks (> 4, 5, or 6). Also, when fast forwarding ('search') (from track #1) into the next few tracks, the noise does not appear.

Similar issue I know from a Naim Audio CDI - go to
https://www.diyaudio.com/community/...cd-1-cds-only-impaired-skip-operation.207813/
Until now I haven't solved resp. find a reason but I have heard, the reason have to do with the firmware (software) of the servo processor unit (Philips MAB8441 - go to
https://www.diyaudio.com/community/...ab8441-data-for-txxx-programming-code.348849/
or Motorola's SC-XC-ZC-MC series.
Faulty components such as electrolytic capacitors can be ruled out here
Best solution is to purchase an other device of the same model (or other model with same main board) for troubleshooting.

 

[statequieta]

I’m still around but (temporarily) switched to repairing/restoring a bunch of integrated amplifiers and power amplifiers which are in my collection.

I still plan to complete the restoration process and then listen to my Mission PCM4000 and my Proton CD player.

My current “daily listening” disc players are a Denon DCM-320 5-disc changer in my living room system and a single-disc Sony DVP-NS775V in the bedroom. The Denon unit sounds incredibly good on every disc I put into it. Many people have little regard for CD changers but this one is exceptional. I haven’t yet identified why it sounds as great as it does. It will be fun to compare it with the Philips-based CD players after I finish restoring them. I hope to do that in the very near future.

-EB

Hi EB!

Did you manage to solve the display trouble of your Proton CD Player? I've got a unit of AC300 MK2 with similar problems in display and would like to enter myself in the audio DIY world by fixing it. It was my father's CD and though I've read it's not a great player, to me deserves everything .

Thanks!

 

[MichaelF]

Hi in this great forum!

I was recently invited to a relative for dinner. Unexpectedly, I came home with a Micromega Solo which did not work correctly. He gave me the device with the words "It would be a shame to throw it in the bin" and "take it home and try to repair it". I thought I didn't need any more projects, but he was right and I decided to take the CD player home with me.

The device has now the following status: the cd spins and the lens moves for a short while up and down and tries to focus but after that nothing seems to happen except that the laser seems to recognize the beginning of the songs. the display shows 1.01, 2.01, 3.01 etc. But it doesn't play any of the songs. Should I be able to see the laser beam? I know it's infrared and dangerous if it goes directly into the eye, but from the side I think you should be able to see something in the dark, right?

I've already opened it a few times and there's a Philips cdm 4/25 inside. I also demounted the servo board from the laserdrive and have also already partially familiarized myself with some of the various repair instructions uploaded here. As i understand the first thing on the agenda will probably be recapping.
What will be next? I thought that I would have to check whether the transformer (it emits a somewhat loud humming noise) is supplying the correct voltages. What is the best way to check if the correct voltage is there? Which of the instructions gives the best information for this? (maybe the Revox B126/B226?)

My "normal" field is more tube amps and electrostatic speakers so im am not so much into transistor or integrated circuits electronics... Do I necessarily need a potential arm band to work with this kind of electronics in order not to destroy any of the components?

Many thanks in advance.

Best Michael

 

[tiefbassuebertr]

Similar issue I know from a Naim Audio CDI - go to
https://www.diyaudio.com/community/...cd-1-cds-only-impaired-skip-operation.207813/
Until now I haven't solved resp. find a reason but I have heard, the reason have to do with the firmware (software) of the servo processor unit (Philips MAB8441 - go to
https://www.diyaudio.com/community/...ab8441-data-for-txxx-programming-code.348849/
or Motorola's SC-XC-ZC-MC series.
Faulty components such as electrolytic capacitors can be ruled out here
Best solution is to purchase an other device of the same model (or other model with same main board) for troubleshooting.

check out post #1 under
https://www.diyaudio.com/community/...ab8441-data-for-txxx-programming-code.348849/
to find out models with same firmware resp. same mask programmable processors

 

[lcsaszar]

Dear all,
I got this PCB some time ago. Does anybody recognise the model where it came from? Thanks.

 

[ulogon]

Pretty sure it's a Marantz CD-40 / Philips CD 630.

 

[lcsaszar]

Thanks.

 

[ivan_pop]

Hi!
I bought a Rotel RCD-865BX.It works perfectly,but no sound at the out analog and digital!
There is inside:
U101-TDA8809T
U103-TDA8808T
U107-MN4264P
U106-SAA7310GP
U102-TCA0372DP2
U108-ZC99685P(DIP40) ???
U109-NJM5534DD
U112-SAA7321GP
U111-SAA7220p/B

I need service manual? I not found discription for ZC99685P?
Reads CDs, but no sound.

 

[tiefbassuebertr]

Dear all,
I got this PCB some time ago. Does anybody recognise the model where it came from? Thanks.

very similar to one of those models under:
http://www.goldfinch-mod.eu/odtwarzacze-cd-2/philips/philips-cd-604-614/
please post an image from solder side - then it is more easy to determine the associated cd player model

 

[ivan_pop]

Dear all,
I got this PCB some time ago. Does anybody recognise the model where it came from? Thanks.

I was doing a Phillips CD630 recap.