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Yamaha CD1050 CD player skipping

I have a late 80's vintage Yamaha CD1050 CD player that is skipping. I've disassembled it & noticed when the actual player chassis was removed & tipped on it side with all the cables still connected it worked perfectly. Lay it down flat & it starts acting up straight away. Tip it up sideways again & perfection!

Any ideas on what the problem is. It had 2 or 3 trips to the service centre in the early 90's for the same problem but that was years ago & I don't know what he did to fix it. I notice that the servo motor that drives the laser position moves in stages rather than moving constantly. It must be the correct action as when it playes up you can see the motor hunting back & forth.

I don't want to toos it as when it works - it's great & it certianly hasn't had a hard life. Cripes it hasn't done anything for the past 5 years but collect dust as we've been using the DVD player to play CD's on.

Thanks,

Andrew

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  • Andrew Freeman Feb 18, 2008

    Graeme,

    thanks for the speedy response.

    We're nearly there. It's better...., but not 100%.

    1. The 1st problem you suggested was a worn bearing on the clamping disk. If you have a look @: http://www.diyaudio.com/forums/showthrea... there is a photo of exactly what I have. Mine is all black just like the photo. I'm presuming the "small white plastic retainer" is the black plate retained by 2 screws that holds the top disc in place. The spinning idler disc has an embeded ball bearing on its top side which runs against the flat plastic surface of the retainer. Mine looked fine with no signs of wear. I felt the top of the retaining mechanism while the disc was running & couldn't feel any vibration. I don't belive this is a concern. Are we talking about the same component?
    2. I sprayed a miniscule drop of Shellys RP7 (same as WD40) on the top bearing of all 3 motors & a drop in the bottom end caps where there is a 0.5mm hole. This didn't seem to do much so I put a drop of very light mineral oil on the spindle of the CD drive motor only. I suspect that may have been the major contributor to the sudden ability to actually play CD's withoput skipping. The motors haven't done much work @ all. I'm suspicious that there is or was nothing wrong with the motor(s), however something has changed. It certainly didn't sound like it was suspect.
    3. The belts all appear to be fine. The laser traverse motor slips in the belt everytime it powers up but I guess that it is designed to do that. All belts look as new.

    The player is now playing CD's but will occasionaly start a few seconds into the first track. If you hit the skip back button it goes back to the beginnning of track 1 & starts correctly. If you leave it to play it will run through the whole CD - no problems. If you skip forward to one of the last tracks or direct it to go there by pressing the track number it hunts around then starts playing an earlier track halfway through it. It is not consistent. The test CD is immaculate with zero flaws. It has no excuses to not be able to read it.

    I feel I'm so close. I can't tell if the lens is dirty. It looks clean, but what is clean?
    I've wiggled the wires to the laser while it was playing & it did nothing suggesting the wiring is fine.

    Any other ideas. Your suggested actions have certainly made a positive change.

    thanks,

    Andrew
    0411 055 112

    P.S. I've also got a Yamaha RX-950 amp that is working fine except the illuminated display doesn't light up. You have to guess which radio station you are listening to. Is this likely to be a "repair by replacement" problem or is there something simple burnt out or something similar that I could repair?

  • Andrew Freeman Feb 26, 2008

    Graeme,



    CD1050 is working 99.9% - Only one slip up since implementing your suggestions. Thank you very much. That'll do me! I'll see If I can work the same magic for the amp.



    Andrew

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Hi Andrew,

Know the unit well. you gotta fix it!! They sound good,and were well built. It will better your dvd for cd playback!!

It is probably mistracking as a result of the chucking assembly hopping in and out of a pit worn into the small white plastic retainer that clips into the large black assembly that raises and lowers the circular black disc that clamps the disc to the spindle motor platter. A half ass fix is to reface the plate, but watch for clearances to the disc being affected.

You can tell the problem by lightly resting your finger on top of the assembly while the disc is running and feel a regular knocking as the ball bearing in the clamper disc, and thrust plate knock in and out. Replace the small white plastic thrust plate and put a dab of decent graphite grease on it. You may also find that the spindle motor is worn also... It produces the same symptoms and can be diagnosed by putting a drop of oil to the top bearing and see of the problem goes away. A lame motor also sounds noisy, not that different to an old diesel engine rumbling away.

Lastly, get a set of load belts for it also. Would be a shame to do all that work and find the drawer jams - always when you really want to use it. Clean the drive belts at least, but replace if perished.

Good luck with your overhaul... I know you can fix it as you have gotten pretty much there already:) A rating of "fixYa" for my tech tips would make me a happy boy

regards
Graeme

Posted on Feb 17, 2008

  • Graeme Ross
    Graeme Ross Feb 18, 2008

    oh yeah... I remember a little better, hehehe getting old...10 years since I was fixing alot of those .... I was thinking of Philips/marantz transport that has the same chucking system and fails in a similar manner. It has the white bit:).The Yamahas had a black plastic plate. Onkyos have the same problem also.



    Cleaning the lens may help. Use a cotton wool bud moistened with windex and carefully clean the lens. I always use a dry one to lightly polish it to be sure that there is no residue smear. Check the traverse drive for dried grease. Clean it if it is at all gluggy with old grease. I would look to replacing the traverse drive belt too. They should not really slip The interconnect looms to lasers can give some problems but generally just stop playing not mistrack when faulty. Some early Yamahas had tracking drive transistors that went noisy with heat. Easy to spot, they browned up the PCB about them when it happened(and burnt your fingers). About all I can remember right now. The machine running ok on its side is a pointer to a spin problem. If it starts mistracking again, the oil has stopped its hydraulic effect in the motor bearing and replacing the motor is the way to go. You used to be able to get the motors(after market) from WES components in Sydney. The LCD backlamp will have failed in your receiver. They just plug in from memory(for what is it:)). You can get em from Prime Electronics(yamaha spares) in Sydney or Brisbane. Good Luck.



    regards

    Graeme

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