Can laser diodes just die?

Discussion in 'Tech talk' started by nicolai fenech, Jul 16, 2024.

  1. nicolai fenech

    nicolai fenech New Member

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    Hi all,
    Im working on a Marantz CD5400, originally just a simple loading tray belt replacement. I got the tray to work fine yet it's still stuggling to read the table of contrents. I tried to clean the lens and give the laser more power but the old gal just wont read. I tried to see if I could see the laser itself and i couldnt see it. I also tried to see if the ribbon cables connected to the laser are torn and they seem fine. My question is, if laser diodes simply go out?, how common is it? and what causes it to go out if it does go out fairly commonly.

    please note that this CD player has been unused for a handful of years, kept in a dusty place and humid (yet no corrosion somehow) and that the laser module itself is a KSM213CCM and the pick up itself is a KSS-213c by sony.

    Thanks in advance!
     
  2. Cassette2go

    Cassette2go Well-Known Member

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    What did you clean the laser with? I normally would use only a q-tip and denatured alcohol.
     
  3. Jorge

    Jorge Well-Known Member

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    Stop doing that!!! Just use air blower, but Not compressed air cans!
    until my day-job moved whole into Genomics, microscopy was my main 'tool of the trade'. and with one decent microscope objective costing more than the most expensive CD player, you would think twice before using Windex or alcohol for cleaning. As always, for best results "call your local Zeiss or Leica distributor" but I also checked that this Zeiss cleaning liquid is safe, and cheap:
    ZEISS Lens Care
    So, if you Must: a bit of cotton on the toothpick with Zeiss cleaner does the trick, immediately followed by the air-blower


    Re. original Q: yes, definitely! But not as often as one may think. My estimate: 1% that burned diode is the problem, 99% that something else killed your player. Luckily, brand new KSS-213c available for just $10, so it is easy to check. For any meaningful advise you must open the player, remove the 'bridge' with CD puck and report what happens when you hit PLAY button. evidently, do not put any CDs on the tray, watch laser lens!
     
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  4. nicolai fenech

    nicolai fenech New Member

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    some thing similar
     
  5. nicolai fenech

    nicolai fenech New Member

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    oh damn, i'll look into the zeiss cleaning liquid for the future.
    I will try to get another pick up while i can, but I also would like to ask what a "bridge" is?
     
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  6. Cassette2go

    Cassette2go Well-Known Member

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    I think he's referring to the part that holds the laser diode in place. It looks like a round part that fits into an oval. That slides back and forth has the Blazer reads the disc and therefore he's talking about the bridge being the entire mechanism that sits on the shelf. Like between the rails of when the player goes in and out. Something like that, my guess
     
  7. Jorge

    Jorge Well-Known Member

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    the idea is to observe laser mechanism and laser lens when you hit PLAY button. maybe you do not have to remove anything, I dunno

    but the 'bridge' I referred to is this plate, which holds CD puck:
    L1080078s.jpg

    when removed, you can see laser mech:
    L1120893s.jpg

    this above is Wadia, but maybe with Marantz this piece does not cover the whole CD, then no need to remove it
     
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