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Mission PCM 7000 repair

Discussion in 'classic' started by Dowser, Dec 31, 2021.

  1. Dowser

    Dowser Learning to bodge again..

    Bought this a while back, sold as faulty, I paid a bit more than I wanted (CHF 90.-), but I've always wanted to listen to one since repairing them when working for Lasky's service department (and never being able to afford one :)) - it's a bisic Philips machine with a dedicated Mission output stage/PCB.

    I was expecting something simple, but loads of repair shop stickers on the back of it rang alarm bells. Damned thing had 4 seperate faults, like it had been used as a parts donor for other repairs...but strange given it's a higher end player.

    1. Mech loading tray gear broken
    2. Mech to control panel wires broken within the Philips connector
    -- For these 2 I just swapped in a mech from a lowly CD-1006 I got for CHF 10.- a while back
    3. DAC/Servo PCB to control PCB connectors wires broken at both ends causing multiple intermittent problems
    -- I've heard of these issues before, but never experienced them - the solid core wire snaps within the insulation by the connector. See below - pain in the ass, but quite straight-forward to strip and re-terminate :)
    4. Short circuit BC818 12v supply to servo surface mount transistor
    -- Stolen from CD-1006 :)

    God alone when this thing was last played, or the state of the caps - but it's functional again and sounds pretty damned good - really hard edged & detailled bass so far after 30 mins, interested to see how it develops.

    I wanted to try a few machines with different output stages, as I intend to experiment with both a valve output stage and a very simple transistor buffer output stage to try and understand what makes a player good. This one is a target for a TDA1541A chip, replacement decoupling TDA caps (uses the stock Philips low end SMTs currently), and /B 7220 :)

    Wow - it just snapped into focus after 45 mins - as good as my CDI? No, clearly not, but I don't feel so bad about the 5 hours its taken me get this damned thing back to life now - great imaging, detailed bass just let down a bit by top end. Need to recap I think.

    Has anyone else heard a Mission PCM 7000?

    Piccies

    Best display of any CD player? I like it
    [​IMG]

    Short circuit (base-collector) transistor
    [​IMG]

    In bits after finally getting it working (missed photo of deciated output PCB, sorry - but just using standard Philips PSU 5v and +/-15v rails, sure dedicated rails would help)
    [​IMG]

    Careful re-termination of Philips connector
    [​IMG]
    Shit picutre of done, sorry
    [​IMG]

    Richard
     
  2. chartz

    chartz If it’s broke fix it!

    Philips inside yes. Those connectors are so easy to repair. Very nice.
     
  3. Darren

    Darren Murder City Devil

    Nice!!
    I own one of these in full working order...... it isnt as resolving as my modern dac/transport but very listenable and fun to have in my rack with its huge display.
     
  4. James

    James Lord of the Erg\o/s

    A PCM7000 was my very first CD-P, bought new in the late 80s. It almost put me off the format. I just couldn't get used to the edgy and highly fatiguing sound.
     
  5. Dowser

    Dowser Learning to bodge again..

    Strange how we hear different things - this for me has the fluidity of a TDA1541, and a nice hard edged/detailed mid-range/bass. My CDI is much better of course, but I could live with the Mission too.
     
  6. James

    James Lord of the Erg\o/s

    I had an LP12/Ittok then and the difference between vinyl and CD was stark. It is much less so now with a Densen B-440XS. There was something that sounded rather contrived to my ears when I first heard the PCM7000, which I attributed to the format.
     
  7. Martyn Miles

    Martyn Miles pfm Member

    It’s interesting how people react to early CD players.
    In Westwood & Mason ( Oxford ) I heard a Yamaha X1, sometime in the ‘80s.
    I was immediately impressed by the sound.

    I’m always suspicious of being very impressed at the beginning.
    After a while it was ‘difficult’ to listen to on some music.
    In the end I went for a similarity priced Sony model ( model number forgotten ) which stayed
    for years.

    I then bought an Arcam Alpha CD player.
    Now that was a very good move...
     
  8. JensenHealey

    JensenHealey pfm Member

    The first CD player I ever had was rented.... then my flatmate went out and bought one of these PCM7000's - it was quite the thing in the press at the time. He loved it and kept for a good number of years until he swapped his entire system for a big stack of Cyrus. I was a bit less enthralled by the Mission. A bit hard edged for my taste I seem to remember.
     

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