Page 2 of 2 FirstFirst 12
Results 26 to 46 of 46

Thread: Neo Geo CDZ disc problem

  1. #26
    Lazy SNK Employee

    Join Date
    Aug 2016
    Location
    Osaka

    Posts
    57
    Quote Originally Posted by Tarma View Post
    Cool, glad to hear you've got your CDZ up and running again!
    My joy lasted just for a while... after some time of usage, loading was slower, then stopped. Now laser is not working. The symptoms are the same as before, disc spins for a second then stops. Now the lens has no scratches, and it worked for a while. Maybe something blew up in the laser? Any idea about what to check?

    Quote Originally Posted by Tarma View Post
    Just out of interest, where did you get your replacement lens from? Generic from eBay? I'd love to be able to find stock of the original Sharp lasers...
    I got a generic one from eBay, about 15 euro. Maybe the quality is too low, and I wonder too if a original Sharp part can be found.

  2. #27
    Old Man
    Tarma's Avatar
    Join Date
    Nov 2001
    Location
    England

    Posts
    5,482
    Oh. Sorry to hear of your new troubles... Off the top of my head the only advice I can offer is - check the wires to the data and power leads that plug into the CD laser assy (if these have come loose then you'll get issues). Try adjusting the pot settings ever so slightly - with a screw driver, just make slight turns and see if it makes a difference.

    There is the possibility your laser is defective, but you'd need another to compare to confirm.

    I've looked everywhere for a nos Sharp assy and can't find one, only these generic Chinese lasers I wouldn't trust as far as I could throw them.
    Bonuskun - "Please young man. You telling me to shut up on an internet forum is about going to have the same effect of trying to tell Tarma that Metal Slug 4 was the best Neo Game ever.

    Not going to happen."


    Argentina'94 - "Gotta admit, that was the best coffee and cigarette I ever enjoyed with someone who wasn't in front of me. We MUST do this again!"


    Peanutbutterjammatime

  3. #28
    Robert Garcia's Butler
    Tw3ek's Avatar
    Join Date
    Oct 2013
    Location
    天外魔境

    Posts
    1,280
    Quote Originally Posted by Demiurgo View Post
    My joy lasted just for a while... after some time of usage, loading was slower, then stopped. Now laser is not working. The symptoms are the same as before, disc spins for a second then stops. Now the lens has no scratches, and it worked for a while. Maybe something blew up in the laser? Any idea about what to check?
    This almost seems like the spindle is stuck too low and causing the disc to scratch the top of the laser. If you place the disc in the unit and try to spin it with your hand, does it make contact with the laser or the bottom of the tray at all?
    [Rot] 1:39 pm: Twonk is a SAVIOR!


  4. #29
    Angel's Love Slave
    GadgetUK's Avatar
    Join Date
    Sep 2013
    Location
    UK

    Posts
    1,058
    Could be the spindle height as a few people have mentioned, but what also sometimes happens is the laser voltage on the new laser is set to some crazy high level and if its a second hand unit it wont last long like that - although I expect that's unlikely.
    My YouTube channel contains some MVS repairs and stuff:-
    http://www.youtube.com/user/GadgetUK164

  5. #30
    Old Man
    Tarma's Avatar
    Join Date
    Nov 2001
    Location
    England

    Posts
    5,482
    Quote Originally Posted by Tw3ek View Post
    This almost seems like the spindle is stuck too low and causing the disc to scratch the top of the laser. If you place the disc in the unit and try to spin it with your hand, does it make contact with the laser or the bottom of the tray at all?
    That's a good call.

    Also, make sure the three "clips" that are attached to the spindle are holding the CD securely - if they're damaged in any way the CD won't spin properly. Replacement spindles will be near impossible to find other than with junk CDZ units.
    Bonuskun - "Please young man. You telling me to shut up on an internet forum is about going to have the same effect of trying to tell Tarma that Metal Slug 4 was the best Neo Game ever.

    Not going to happen."


    Argentina'94 - "Gotta admit, that was the best coffee and cigarette I ever enjoyed with someone who wasn't in front of me. We MUST do this again!"


    Peanutbutterjammatime

  6. #31
    Lazy SNK Employee

    Join Date
    Aug 2016
    Location
    Osaka

    Posts
    57
    Quote Originally Posted by Tarma View Post
    Oh. Sorry to hear of your new troubles... Off the top of my head the only advice I can offer is - check the wires to the data and power leads that plug into the CD laser assy (if these have come loose then you'll get issues). Try adjusting the pot settings ever so slightly - with a screw driver, just make slight turns and see if it makes a difference.
    Thanks for the advices. I double checked all the leads, and they are firmly in place. Next thing I will try is turn slightly the pot...


    Quote Originally Posted by Tarma View Post
    There is the possibility your laser is defective, but you'd need another to compare to confirm.
    Problem is it worked for a while... maybe it was so poor quality made and reached the end of his life in those minutes. Bigger problem will be if the console is frying the laser, but the previous one had the obvious problem of scratched lens.


    Quote Originally Posted by Tarma View Post
    I've looked everywhere for a nos Sharp assy and can't find one, only these generic Chinese lasers I wouldn't trust as far as I could throw them.
    I saw one, but it has no Sharp logo or sticker, and the seller says the final product is not the one shown on pictures, so I was doubtful about buying from him.

  7. #32
    Lazy SNK Employee

    Join Date
    Aug 2016
    Location
    Osaka

    Posts
    57
    Quote Originally Posted by Tw3ek View Post
    This almost seems like the spindle is stuck too low and causing the disc to scratch the top of the laser. If you place the disc in the unit and try to spin it with your hand, does it make contact with the laser or the bottom of the tray at all?
    No contact at all. I have the upper case of the console removed and I can see the disc makes no contact with anything. I will check the lens with the camera, but the scratches in the original one look like they were not made by contact with a disc.

  8. #33
    Lazy SNK Employee

    Join Date
    Aug 2016
    Location
    Osaka

    Posts
    57
    Quote Originally Posted by GadgetUK View Post
    Could be the spindle height as a few people have mentioned, but what also sometimes happens is the laser voltage on the new laser is set to some crazy high level and if its a second hand unit it wont last long like that - although I expect that's unlikely.
    It was not a second hand or used laser, but a new one. Chinese made, I must add. Voltage can be adjusted somehow? How can I check it?

  9. #34
    Lazy SNK Employee

    Join Date
    Aug 2016
    Location
    Osaka

    Posts
    57
    Quote Originally Posted by Tarma View Post
    That's a good call.

    Also, make sure the three "clips" that are attached to the spindle are holding the CD securely - if they're damaged in any way the CD won't spin properly. Replacement spindles will be near impossible to find other than with junk CDZ units.
    Checked. All the three clips, tabs or whenever the name is for those three things in the spindle work correctly: they go up after pressing at the blue center, and down when you put there a disc.

  10. #35
    Robert Garcia's Butler
    Tw3ek's Avatar
    Join Date
    Oct 2013
    Location
    天外魔境

    Posts
    1,280
    Quote Originally Posted by Demiurgo View Post
    No contact at all. I have the upper case of the console removed and I can see the disc makes no contact with anything. I will check the lens with the camera, but the scratches in the original one look like they were not made by contact with a disc.
    Did you desolder the point on the laser mech that is bridged to avoid transport damage?
    [Rot] 1:39 pm: Twonk is a SAVIOR!


  11. #36
    Lazy SNK Employee

    Join Date
    Aug 2016
    Location
    Osaka

    Posts
    57
    Quote Originally Posted by Tw3ek View Post
    Did you desolder the point on the laser mech that is bridged to avoid transport damage?
    Yes, I did before installation. I think it will never had worked without removing that bridge.

  12. #37
    Angel's Love Slave
    GadgetUK's Avatar
    Join Date
    Sep 2013
    Location
    UK

    Posts
    1,058
    Quote Originally Posted by Demiurgo View Post
    It was not a second hand or used laser, but a new one. Chinese made, I must add. Voltage can be adjusted somehow? How can I check it?
    The potentionmeter (variable resistor) on the optical pickup unit (the laser unit you swapped). That is where you set the voltage - if its higher than it should be it can burn the laser out pretty quick.
    My YouTube channel contains some MVS repairs and stuff:-
    http://www.youtube.com/user/GadgetUK164

  13. #38
    Lazy SNK Employee

    Join Date
    Aug 2016
    Location
    Osaka

    Posts
    57
    Quote Originally Posted by GadgetUK View Post
    The potentionmeter (variable resistor) on the optical pickup unit (the laser unit you swapped). That is where you set the voltage - if its higher than it should be it can burn the laser out pretty quick.
    Here is a picture of both laser, left the old Sharp and right the new one, already installed. You mean the pots I marked in the picture? Do you know which side must I turn to, for example, reduce voltage?

    Clipboard.jpg

  14. #39
    Lazy SNK Employee

    Join Date
    Aug 2016
    Location
    Osaka

    Posts
    57
    Any help with that?

  15. #40
    Robert Garcia's Butler
    Tw3ek's Avatar
    Join Date
    Oct 2013
    Location
    天外魔境

    Posts
    1,280
    Quote Originally Posted by Demiurgo View Post
    Here is a picture of both laser, left the old Sharp and right the new one, already installed. You mean the pots I marked in the picture? Do you know which side must I turn to, for example, reduce voltage?

    Clipboard.jpg
    Yes, this is what you must turn to calibrate the laser correctly
    [Rot] 1:39 pm: Twonk is a SAVIOR!


  16. #41
    Lazy SNK Employee

    Join Date
    Aug 2016
    Location
    Osaka

    Posts
    57
    Quote Originally Posted by Tw3ek View Post
    Yes, this is what you must turn to calibrate the laser correctly
    Thanks for the confirmation. Do you know which side must I turn to, for example, reduce voltage?

  17. #42
    World Soccer '96
    greatfunky's Avatar
    Join Date
    Apr 2016
    Location
    France

    Posts
    122
    There's a tutorial on Xian Xi 's website, for the ngcd not cdz , but i assume the process is the same .


    http://www.jamma-nation-x.com/jammax/tutorials.html

  18. #43
    Lazy SNK Employee

    Join Date
    Aug 2016
    Location
    Osaka

    Posts
    57
    Quote Originally Posted by greatfunky View Post
    There's a tutorial on Xian Xi 's website, for the ngcd not cdz , but i assume the process is the same .


    http://www.jamma-nation-x.com/jammax/tutorials.html
    Yes! Thanks to the tutorial I found that turning it clockwise will increase laser power.

  19. #44
    Angel's Love Slave
    GadgetUK's Avatar
    Join Date
    Sep 2013
    Location
    UK

    Posts
    1,058
    Looks like they are set quite different there! If it doesnt work after setting the new laser to approx the same position the old laser was (originally), then I would say the laser has failed (again). Best way to set these is to measure the RF level on a scope, and I am guessing from the era of the drive the RF level should be between 800mV to 1.2v ish, the lower the better.
    My YouTube channel contains some MVS repairs and stuff:-
    http://www.youtube.com/user/GadgetUK164

  20. #45
    Lazy SNK Employee

    Join Date
    Aug 2016
    Location
    Osaka

    Posts
    57
    Now waiting for another laser...

  21. #46
    Old Man
    Tarma's Avatar
    Join Date
    Nov 2001
    Location
    England

    Posts
    5,482
    What happened in the end? Did you get a successful resolution? Sorry I couldn't offer any further advice, but hope you've got it fixed!
    Bonuskun - "Please young man. You telling me to shut up on an internet forum is about going to have the same effect of trying to tell Tarma that Metal Slug 4 was the best Neo Game ever.

    Not going to happen."


    Argentina'94 - "Gotta admit, that was the best coffee and cigarette I ever enjoyed with someone who wasn't in front of me. We MUST do this again!"


    Peanutbutterjammatime

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •