Question about Aiwa JAX-S5 CD Shelf System

4 Answers

Getting a whine from CD player

I've had this unit for going on four years, and recently I've started getting a high-pitched whine when playing some CDs. Not all CDs, just certain CDs. And it sometimes gets so bad that it also induces read errors to where the CD will start skipping and sometimes even stop playing. It seems to happen only on the first few tracks, once you get past the third or fourth track the CD plays fine. Anybody know what might be going on here?

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  • Big G 94 Mar 06, 2008

    OK, I know what is going on here, the reason I purchased the upgraded assistance is to get some help on fixing it. Because I have the parts to fix it and I know where the parts are supposed to go, but I don't have the knowledge to do it.



    I know, from a Sony Technical Bulletin, that this is caused by an oscillation problem with the specific Sony optical pickup (KSS-240A) that's installed on the thing, that causes a mechanical resonance issue with the discs as they play. I know, from a Sony Technical Bulletin, that the fix for this is to add a brass weight (part No. 4-962-979-01) to the pickup, and a felt washer (part No. 4-986-769-01) to the surface of the clamper that touches the disc. The screw (part No. 7-685-134-19) that adds the weight to the pickup replaces the screw that holds the PC board with the pots to the laser.
    I have these parts in hand from Sony, ready to install. I have spent the morning trying to find someone to install them, since I've never done this kind of thing before. I've discovered that no one works on stereos anymore. I'm not surprised of this, because I'm sure they're considered kind of disposable. But I don't want to dispose of this one when all that needs to be done is a piece of brass screwed in somewhere and a piece of felt stuck somewhere.



    So, can someone give me an idea ... not just an idea, but a hold-my-hand, "See Spot Run" level A through Z set of directions ... of what I need to do here to do this myself, because it's basically going to be me doing it. When I open this unit up, what do I need to do? What do I need to look for? What do I need to be careful of? What do I need not to touch? What's the PC board with the pots look like? What's the laser look like? What's the clamper? (Is it what the discs sit on when I put them in?) Stuff like that. Thanks in advance for any help.


  • Big G 94 Mar 06, 2008

    Yes I've cleaned lens ... please check my followup on this. Thanks!

  • Big G 94 Mar 06, 2008

    Hi, please see my followup on adding the brass weight to the optical pickup and the felt to the disc clamper. As I noted in the followup, the research I have done with Sony Technical Bulletins, etc., indicates this is the problem. It is absolutely showing every symptom associated with this problem (the whine is only on the first few tracks of the CD, it happens more often with discs that feel noticeably lighter in weight than usual). I have the parts to fix this problem. I just don't know how to do it. I'd like some help in knowing how to do it, because no tech in my area will touch this. Thanks!

  • Big G 94 Mar 06, 2008

    Eagle, the brass attaches to the pickup and the screw is supposed to replace the screw that holds the PC board with the pots to the laser. That's all I know. It's a little rectangular piece of brass, looks like it's slotted to fit a certain way. And the felt is supposed to go to the surface of the clamper. FYI from my original post, this is a common problem with the KSS-240A Sony pickup that is used in these Aiwa units and the parts I got are what is recommended from a Sony Technical Bulletin. A friend of mine has a similar unit ... these are great sounding stereos, I thought about replacing it but I couldn't find anything better ... and his was doing the same thing and he put lead tape on two opposite corners of the CD tray and it stopped the resonance, but I'd rather do what was recommended by the manufacturer. Thanks!

  • Big G 94 Mar 06, 2008

    Aviori, sorry I didn't mean to cut you off, this is the first time I have used this site's premium service and I am not familiar with the procedures. I certainly would be willing to follow up with anything from anybody. What you have mentioned as far as the spindle, I am aware of, it's supposed to be the next step if adding the weight to the pickup and the felt to the clamper doesn't work. I wanted to try that route first since it's much easier. If that doesn't work, then I'll have to look in a different direction.

  • Big G 94 Mar 06, 2008

    Eagle, I accidentally clicked something ... THIS IS MY FIRST TIME USING THIS AND I AM NOT FAMILIAR WITH THE PROCEDURES ... that took away my ability to post responses to you. Hopefully there is some way that you can follow up with me. Thanks!

  • Big G 94 Mar 16, 2008

    Hi guys, I am sorry I have not gotten back to anyone on this, I sort of had to put it on the back burner because of some issues around the house. Probably within the next week or so, I'm going to attempt to do this fix, thanks to everyone who has posted diagrams I feel much more comfortable doing this. I just need to make sure ... as I do when I'm doing things inside my computer ... to guard against static electricity discharge. What I always do with that, and I'm planning to do with this, is work on it in the middle of the kitchen floor (no carpet) ... we still have some metal water pipes, so what I do is touch those occasionally to hopefully prevent the discharge (a tech advised me to do that ... if I'm not doing it right, please let me know so I won't get a nasty shock :). Thanks!

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  • 6,966 Answers

Hi,

With the indulgence of the group and IB4G2008's comments..

Below is a an image of the KSS240A laser/optical lens assembly. As can be seen, there is only 1 ***** that most likely will be user removable.
Getting a whine from CD player - cd4d643.jpgImage was from here.
Additionally, most mechanism would be something similar to this. 37eea4d.jpg
Image was from here.

I would venture that FELT is to be placed on top of the spindle (Disc Drive on above image) for the purpose of dampening mechanical vibrations induced to the disc;
The BRASS WEIGHT and ***** would go to where the original ***** was placed near the sticker to provide an offset balance to the entire laser/optical lens assembly preventing any vibrations.

Hope this be of additional help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Mar 12, 2008

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  • Master
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You know, for the modicum of information that 5 or 10 gets you, it's embarrasing to see you milk these fine experts for information..let it rest sir. the game is over..

Posted on Mar 12, 2008

  • Patrick Michaels
    Patrick Michaels Mar 16, 2008

    well..nice that you got back to some of them. I nominate Eagle to get the dough, since his solution is finest..

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  • Master
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Hi there! i have listed out the parts of cd player(see image). The clamper is a part of the cd tray ejecting mechanism that is under the tray. The pcb is used to power the lens mechanism and the laser you are talking about is a part of the lens mechanism(it uses laser to read the discs). Now tell me where did the tech tell you install the brass string and i will help you out
Getting a whine from CD player - 75794fa.jpg

Posted on Mar 06, 2008

  • 1 more comment 
  • eagle338
    eagle338 Mar 06, 2008

    oh! report to fixya... they will sort it out for you... also i usig my phone and i am in the class i will reply ur post in less than 3 hrs.

  • eagle338
    eagle338 Mar 06, 2008

    mailto: experts@fixya.com and address it to chantelle

  • eagle338
    eagle338 Mar 09, 2008

    I have requested them to revert it.. It will be done soon.. We can get back in touch.. Also i have figured out where you have to insert the brass weight get back in touch and we will finish it off..

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  • Expert
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Have you performed lens cleaning process?

Posted on Mar 06, 2008

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  • ExpressFiX
    ExpressFiX Mar 06, 2008

    There are several reasons, First can be cleanliness, Tiny dust particles might create obstacle for laser beam that goes on the CD and reflects back to read the track.
    Second possible reason is the lens angle, sometimes due to environmental facts lens holder might slightly bend. That causes weak reading.

  • ExpressFiX
    ExpressFiX Mar 06, 2008

    Angle also can change by unstable spindle, So make sure spindle is stable and its screws are not loose.

  • ExpressFiX
    ExpressFiX Mar 06, 2008

    Yes oscillation might happen due to unstable spindle, There will be some mechanical parts support the spindle. Also check them

  • ExpressFiX
    ExpressFiX Mar 06, 2008

    the method that you were mentioning is required after we conclude the reason of oscillation. I have fixed many similar issues. By experience I have concluded best thing is to diagnose the issue. Aiwa engineers wont recommend modification. But personally I have done some cases if the issue cannot be resolved by spindle support parts.

  • ExpressFiX
    ExpressFiX Mar 06, 2008

    You have rated, without letting me post some more details. So I take it as you have concluded to not follow up. anyway thank you and good luck

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