Question about Denon DN-961FA CD Player

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New laserunit won't work

After placing a new laser unit (KSS-240A) the cd-palyer will not play any cd's. Putting back the old laser units will let the cd player read the cd and play it, although it skips over the disc from time to time.

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  • M G Mar 14, 2008

    @Rob, I know just replacing a laser unit will not work ;-) , but after exchanging the laser unit the player does not respond whatsoever to CD's so I can not make any adjustments to the unit. The exact name is DN-961FA



    @StuartB. I have repaired a lot of these Denon cd players. I always clean the mentioned runners. This time the unit didn't respond at all. Disc spins but stops after a few seconds.



    Last week I repaired a DN-951FA and replaced the laser unit with an imitation laser, this one works fluently right after replacement. Allignment was within the manual tollerances. Just out of curiosity I placed this laser in the DN-961FA and the unit didn't worked. All allignment was correct. Replacing the old laser solved the problem, but this laser is worn out.

  • M G Mar 20, 2008

    Ok, took the DN961 again today and tried and tried again. Laserpower is OK, focus is OK. With a imitation unit the player will play discs, but with an original Sony KSS-240A laser, the unit will not work.

    I know there are lasers out there that have a short-circuit to protect the laser, couldn't find this circuit on these lasers or am I overseeing (blind ;-P) something?



    Just for the record, one player was used at a BBC station, the other came from a Dutch broadcaster.

  • Rob Galayda May 11, 2010

    OK, let me get this straight......when you place a new laser in the problem unit, the laser goes "home" to the center of the disk, the laser turns on, you get laser focus lock, you get spindle kick,the eye pattern develops, you get tracking lock and it STILL Doesnt work?....or where in the chain does it stop?



    Shout me back....Rob



    IS it possible that someone got in there before you and "optimized" the existing allignment ( I hate when people do that ) to compensate for a weak laser ?.....maybe the electrical setup is so far out that a proper laser is either blind or trying to X-ray the disk ! I would de-solder a lead to the spindle motor and see if you can get focus lock without the disk turning. Who knows, maybe somoeone replaced the motor, didn't set the spindle height and then fudged the allignment to compensate....Rob


  • Rob Galayda May 11, 2010

    Oh boy...you cant just place a laser in the unit, it must be alligned.

    Allignment can consist of both mechanical and electrical. You will need an oscilloscope capable of at least 40 MHZ response and a service manual for your particular unit.



    Give me the model number and I will see what I have in the shop.



    Best of luck....rob

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You seem confident enought to take it apart, have you tried cleaning the runners that the laser runs backward and forward on.
Some times they collect dirt/dust and the laser can't move smoothly so it jerks and skips.

Posted on Mar 14, 2008

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