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Linn Karik Lasers Available

Discussion in 'audio' started by david ellwood, Feb 11, 2007.

  1. david ellwood

    david ellwood Kirabosi Kognoscente

    If you have a karik that is skipping, lasers to repair are available.

    kariks pre 13000 serial are hitachi HOP-M3 lasers.

    available from cpc at £14

    http://cpc.farnell.com/jsp/endecaSearch/partDetail.jsp?SKU=AS00418


    if you have a karik post 13000 or an ikemi the laser is a hitachi HOP-M3a

    These are quite a bit more expensive at £18

    http://cpc.farnell.com/jsp/endecaSearch/partDetail.jsp?SKU=AS00316


    replacement is easy just remove the mech (four screws into the tray)

    remove ribbon connectors to main pcb.

    lift out the mech.

    remove the two connectors to the laser assy (under the mech)

    undo (a quarter turn) the two cam locks retaining the transport bars.

    remove the transport bars.

    tease out the old laser and replace.

    replace the transport bars.

    replace all in reverse order.

    when I have time I will detail alignment of the laser (requires scope)

    never adjust the pot on the laser assy it is factory set for life.
     
  2. rubaiyat_23

    rubaiyat_23 pfm Member

    "never adjust the pot on the laser assy it is factory set for life."

    This might be suspect–laser current setting is pretty crucial–if it's set at the factory there will be a) a specific measurement, and b) an effect on sound quality.

    If, on the other hand, the trim pot sets the focus, this may not be so bad. More information required from both Linn and Hitachi on this.
     
  3. aardvark101

    aardvark101 Audio Bully

    ive got a rega planet with a dud laser,do they do one that i can replace it with?
     
  4. david ellwood

    david ellwood Kirabosi Kognoscente

  5. aardvark101

    aardvark101 Audio Bully

    without a serial number on the back the local dealer said no,could go straight to rega i suppose,anyway if i can repair it cheaper, nuff said.
     
  6. markt

    markt hello



    I think they may actually be KSS240A, in which case http://www.dalbani.co.uk/index.php should come in handy, around £15 each (unbranded).
     
  7. sktn77a

    sktn77a pfm Member

    David:

    Do you have similar information for replacement of the laser on NAIM CD players? They appear to suffer a higher than normal failure rate and several cannot be repaired by the factory as complete replacement mechs are no longer available.
     
  8. tof

    tof pfm Member

    David,
    do you mean that after having replaced all in reverse order, there is still something to work out regarding laser alignment?

    many thanks

    Jean-Christophe
     
  9. david ellwood

    david ellwood Kirabosi Kognoscente

    yes

    there are two things that can be aligned.

    focus servo

    laser current.

    put you scope on the Vrf test point and adjust the focus servo trimmer (just north of the test point) for clear eye pattern.

    a new laser is likely to be a bit bright and the laser current can be backed off.

    turn the trimmer (on the laser assy) anticlockwise til eye pattern is 1.4V p-p.

    when measured all the new lasers i have fitted have resulted in a level of 1.6 - 1.8v when fitted new.

    under no circumstances turn the laser current above the level set at factory.

    this control is incredibly sensitive and the slightest movement can result in a big voltage change.

    With experience you can set laser current by ear as it really sounds so much better when it is correctly adjusted.
     
  10. tof

    tof pfm Member

    David,
    many thanks for this useful information.
    By the way, it seems they have limited stock of lasers. We'd better ordering them quite soon

    Jean-Christophe
     
  11. r50bike

    r50bike Member

    I have a Linn Karik 111 with a failed laser and am about to replace it.
    I note the usefull info on Focus adjustment and Laser current adjustment.
    The test points don't tie up with the Karik III which is fitted with a later version PCB.
    Does anyone know the correct method of adjustment for the Karik 111
    thanks
    Ian Macdonald
     
  12. Warren Day

    Warren Day pfm Member

    The Mimik is a cut down of the Karik.

    Can these lasers be used in Mimiks?
     
  13. hepcat

    hepcat Active Member

    If I remenber corectly mimik uses Hop-m3a
     
  14. stappvargen

    stappvargen New Member

    Hello r50bike. Any luck on finding the test points on Your Karik III?

    David, could You please clarify if the laser assay pot that adjusts the bias point to 1.4V is the same one that You say never to adjust in post 1? ;)

    I just bought a HOPM3 for my Karik and I'm desperate to adjust it optimally.
    Any further help is much appreciated.

    Thank you for a very usefull thread!

    Best regards,
    Niclas
     
  15. Midlandaudiox

    Midlandaudiox Trade: Midland Audio X-Change

    I ned a power supply for an original Karik any ideas?
    jr
     
  16. Craig B

    Craig B Re:trophile

    Anyone know for sure which model Sony laser was used in the original clamshell Planet?

    Craig
     
  17. Craig B

    Craig B Re:trophile

    Never mind, I've managed to determine that these optical blocks were either Sony KSS-213B or KSS-240A.

    What I am not sure of is whether or not these are interchangeable (doubtful), or whether the mech that each one fits matches the early red coloured PCB vs. the later purplish coloured one.

    Basically, I am reluctant to remove the optical block from the transport mechanism of my still working Planet just to find out for sure.

    On the other hand, I would like to stock at least one spare as this is likely to be my last CDP and I enjoy it enough to want to keep it going for as long as possible. IOW, before having to succumb to the sound-bite generation's preferred server based solution.

    Any shared experience would be appreciated.

    Craig
     
  18. linnfomaniac83

    linnfomaniac83 I bet you can’t wheelie a unicycle!

    i know that the jupiter 2000 used a kss 213b as i have replaced one before, if you look through the top of the planet you should be able to see a white sticker on the back of the laser withou stripping the machine. the sony based players are pretty much plug and play and replacing the laser is a very simple job
     
  19. Eyebroughty

    Eyebroughty JohnC

    Hi,

    I see the laser for the post 13000 Kariks / Ikemi are gone :(

    Never mind, scrap value or the antiques roadshow in 25 years :p

    Cheers

    John
     
  20. david ellwood

    david ellwood Kirabosi Kognoscente

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