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Thread: Sega multimega freezing

  1. #1
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    Sega CD Sega multimega freezing

    Hi

    I have a problem, the laser was recently changed on my sega multimega. it seems to work, even plays the game Silpheed (with level select I have tried most of the levels and sequences...I suck at shooters)...BUT when it comes to play some movie sequences it freezes like sonic cd and koiko flying squadron. sometimes if the comsole is upside down it will play the film without freezing, what can the problem be?

    I'm using the correct voltage.

    Mirjam

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    Hedgehog-in-Training Hedgehog-in-TrainingNameless One pyroesp's Avatar
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    My brothers mega-CD has a similar issue where when it tries to play the intro video of sonic CD it keeps trying to load but fails and stops spinning.
    I have to open the cd cover thing and close it again for it to actually retry to load the video and then it works.
    Not sure either why it does this. Haven't messed up with the laser pots yet either.
    Have you tried just opening and closing the cd cover ?


    I'm curious to why you tried to run a CD upside down ? Also weird that it works like that tbh.
    Could be laser focus as I'm guessing the CD would be further away from the laser when it's upside down ? Just a guess though.

  3. #3
    Video Game Modder Outrunner segasonicfan's Avatar
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    Haven't messed up with the laser pots yet either
    Do Not Mess with the laser pots on the sub board! It's a great way to permanently f-up your unit by destroying the stock calibration. That calibration should only be done with an oscilloscope while closely following Sega's guidelines in the MCD2 datasheet.
    Sounds like your laser is just going bad. There are SO many bad lasers on the market, people are resorting to messing with the EF,B instead of getting a better laser.
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    Hedgehog-in-Training Hedgehog-in-TrainingNameless One pyroesp's Avatar
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    Quote Originally Posted by segasonicfan View Post
    That calibration should only be done with an oscilloscope while closely following Sega's guidelines in the MCD2 datasheet.
    If I ever do that (probably not), I'd obviously use the service manual and my scope, no worries.

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    Video Game Modder Outrunner segasonicfan's Avatar
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    Quote Originally Posted by pyroesp View Post
    If I ever do that (probably not), I'd obviously use the service manual and my scope, no worries.
    Cool. I have nightmares where people kill CDX's like this without using an oscilloscope. They're piled up just like skulls in the opening scenes of Terminator.
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    Wildside Expert vexatious's Avatar
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    Quote Originally Posted by segasonicfan View Post
    Do Not Mess with the laser pots on the sub board! It's a great way to permanently f-up your unit by destroying the stock calibration. That calibration should only be done with an oscilloscope while closely following Sega's guidelines in the MCD2 datasheet.
    Moreover it should only be done when machine is refreshed with brand new high quality capacitors. This goes for any console or electronic from 20th century that's never been serviced; functioning or not. And very used up older consoles from 21st century (ps2, gamecube, xbox and late model dreamcasts).

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    hm, some more playing around with it. It looks like is not needed to be upside down to work, as long as I play a game for a while, the game won't freeze and will play the movie just fine (both on sonic and koiko). Strange, but I can live with it I guess.

    Here is the deal, I know the sega multimega/CDX are very hard to repair.
    What I know there are two people in the UK, some unknown guy in Germany, noone in Sweden where I live wanted to take a look at it...and I did try and contact you segasonicfan some months ago regarding problems reading disk and asking you if you wanted to fix it but you never answered back...so I sent it of to one of the UK guys and I know he did touch the pots to make the new laser to work but he did his best and I'm not angry, his been very professional about it. What I'm trying to say is finding a 'good' laser is like finding a needle in a haystack and finding someone who is good with fixing a cdx/multimega is even harder. Money was not a issue in this case, I did ask around who could fix it.

    Mirjam
    Last edited by Winterwolfen; 02-07-2019 at 01:45 PM.

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    I had similar problems with my 3DO FZ-10. Some games would work while it struggled to read others, but would always be perfectly fine when turned upside down. I replaced the laser to fix it.

    Maybe coincidence, but maybe not when it comes to potential failure modes, but both the Multimega and the FZ-10 use similar Sanyo lasers: the SF-C93 for the Multimega and the SF-C92.5 for the 3DO. Goldstar 3DOs apparently use the SF-C93 too.

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    Video Game Modder Outrunner segasonicfan's Avatar
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    Quote Originally Posted by Winterwolfen View Post
    I did try and contact you segasonicfan some months ago regarding problems reading disk and asking you if you wanted to fix it but you never answered back
    My sincere apologies for not replying. I saw in your message you said you were from Europe and there would be VAT in addition to high shipping costs. You also described a more complex problem in the old PM so that mustve made me weary as well. I do get a lot of PMs and emails for CDX and other repairs and I dont always have the time to answer them all. Sometimes I need to weed out the more serious inquiries that are less expensive for shipping from the jobs that seem less likely to work out (especially with International shipping rates these days).

    It's a difficult repair you describe, even with the extra lasers I have here, I'm not sure that would fix it. It sounds like you need a recap though I would start by investigating other issues.

    Many of the lasers on the market for CDXs advertised as new drop-in replacements are actually bad. I'm guessing many of them are "repaired" overseas and recalibrated to incorrect specifications. I know there is a market for fake NOS lasers these days. I get about one good laser for every 3-4 I buy. It has been frustrating.

    Anyway, sorry for not getting back to you. I'll send you a PM. I do have a full workload right now, but at the very least I can chime in here with others to help out.
    Last edited by segasonicfan; 02-08-2019 at 02:42 AM.
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    Please don't PM me for free repair advice.
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    If you cannot post here, I recommend these places that don't have posting restrictions:
    https://nfggames.com/forum2/index.php
    https://www.smspower.org/forums/
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