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Resurrection of a Philips CD555 Sound Machine

Discussion in 'Tech talk' started by Virgil Gheorghiu, Apr 1, 2017.

  1. Virgil Gheorghiu

    Virgil Gheorghiu New Member

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    Does anybody have some pointers into repairing the CD part of this unit?
    It is a TDA-1540-based machine, with a CD-2 vertical unit. Currently, the CD does not read TOC.
    The lens seems to focus fine in factory test modes, but tracking does not function (hence the TOC read failure). Motor seems to spin properly.

    I am currently working my way through the cassette unit, I printed a new gear that was rot, and installed a new belt. Everything else seems to work fine (radio, amplifier, speakers).

    Thanks,
    Virgil
    Philips_CD_555_Sound_Machine.jpg
     
  2. walkman archive

    walkman archive Administrator Staff Member

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    Welcome to the forum.
    This is not the right forum to post this, Virgil. Also, you'll get better response if you first introduce yourself, like in the real world...
     
  3. Virgil Gheorghiu

    Virgil Gheorghiu New Member

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    Hi, Hugo

    Yes, I know, sorry about the mishap. Here's my experience on it.
    It was extremely frustrating yesterday - when trying to reply to another thread (http://www.stereo2go.com/forums/threads/bought-this-deck-cheap-for-dolby-s.744) - I kept getting a message that I can't post to that thread because I didn't start a conversation (though I had resurrected and migrated my old login from the old site).

    I then spent 20 or so minutes trying to find a simple button that said "start a new thread", which I failed to find on the new site design.
    So I posted this one (which I actually do want to post as a new thread) so I can reply to the other thread...

    I hope that makes sense.

    Thanks,
    Virgil
     
  4. Jorge

    Jorge Member

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    When resurrecting Discmans, it was playing with Tracking Balance pot which saved the day. Once it was a weak/dying laser, and once it was a cracked flex board (Kaosun at kaosuncd.com fixed that Philips for me)
     
  5. Virgil Gheorghiu

    Virgil Gheorghiu New Member

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    Hi,

    Just some quick updates on the machine:
    I've completed the repair of the cassette part; after several 3D prototypes and some printer mishaps, I got a pretty good gear printed and installed.
    The following videos show the transport in action in testing and also mounted back in the machine.
    I've completely disassembled the transport because it required cleaning, degreasing and re-greasing. I've used Bayer high-friction grease for the cassette door and lithium-based for the three ball bearings moving the head transport up and down.
    I've done some recordings as well, and it sounds fantastic - for a machine with no manual controls it records superbly.
    The Dolby system is used for both playback and recording, and the machine has automatic bias calibration for Type I, Type II and Type IV.

    Transport tests:


    Tape playback tests:


    Back in the face panel:


    Printed gears:
    Gears.jpg Printed Gear.jpg

    The CD part is next.
    No capacitors were damaged in the making of these videos :)
     
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  6. Jorge

    Jorge Member

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    Congratulations! You are almost there... Any signs of life from CD player?
    How did you manage to print gears?
     
  7. Virgil Gheorghiu

    Virgil Gheorghiu New Member

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    Hi, Jorge

    Thanks for the kind words.

    For the cassette:
    I designed and printed the gear myself. My 3D printer decided to act up after about 1/2 year of storage, and it took about a week to "convince" it to behave again.
    I used the orange / yellow TPU filament (which is flexible), not the blue PLA filament (which is hard); the TPU makes less noise and is closer to the original gear's material.
    Here's a link for the yellow filament I ended up using:
    https://www.amazon.com/dp/B01J23VHPW

    For the CD:
    Unfortunately no signs of life from the CD player, I'll have to dig deeper. It's hard to get by another transport like this - including the servo PCB where I think the issue is. Mine is a CDM-2/29 0301. I need to compile a list of possible model donors just in caseā„¢.
     
  8. Boodokhan

    Boodokhan Active Member S2G Supporter

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    Virgil,
    I see that you are an expert yourself but I would like to share my experience with one of my CD players. Thanks to @Jorge , i found out about Kaosuncd and this guy repaired my diskman nicely.
     
  9. Jorge

    Jorge Member

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    You can read my (horror) story of Philips RCD2 laser mech here: Philips AZ-6892
    Once I recognized the trouble, I bought three (!) more Discmans with the same laser, and all three had corroded lasers. Sent all four lasers to Kaosun and he managed to resurrect two!!! If you take a look at this you realize why I consider him a Magician:
    L1070341sm.JPG

    Your CD555 has CDM-2, lucky you! My list shows quite a few players with this mechanism. Hopefully it is just bad electrolytic or drifted tracking/focus pots ;)
     
  10. Virgil Gheorghiu

    Virgil Gheorghiu New Member

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    Hi, Jorge,

    Thanks for sharing; I read the story about your Philips AZ-6892 some weeks ago and I'm very happy to hear he came through with reviving two units. He is a good magician, then.

    Yes, while the CDM-2 is quite common, there are at least /10 and /29 versions I know of and each has eight different PCB's (0000, 0001, 0003, 0300, 0301, 0303, 0008, 0307) with different connectors and signal paths.
    Would you mind sharing the list with me? I'm aware of only one other unit matching this transport identically and even that has to be within certain revisions, because of a design/unit change later in fabrication.

    Oh, if life would be so easy :) no, all capacitors tested out fine, and the only varistor is for focus, which checks out fine. This is going to take some time...
     
  11. Virgil Gheorghiu

    Virgil Gheorghiu New Member

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    Hi, Boodokhan,

    This model has a special place in my heart; it's unfortunate I ended up with one that was so neglected.
    I hunted for one for more than a year until this one showed up. There was sand and rust inside - yet nothing corroded on the PCBs - and clearly this sat outdoors.
    After taking a bubble bath the main unit is almost spotless; I had to reglue the speakers' cabinets joints (they're made of wood) and clean the drivers as well. Now that all that is out of the way and in good shape, I hope I can revive this transport without a donor.
     
  12. Jorge

    Jorge Member

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    List of laser mechs is the second worksheet of my Excel table here: PCDPs
    Initially downloaded from somewhere, there are few sites with this list. Frankly, I never compared if they are the same, just transferred one into Excel. If DCM-2 modifications are not interchangeable then your "fun" shall continue :confused:
    Just in case my five cents help: when resurrecting Marantz CD-63 (Philips clone), ALL Philips-branded electrolytics were "at least" 30-40% off
     

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