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Thread: Sega Outrun Upright Road and vertical stripe problem

  1. #1
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    Sega Outrun Upright Road and vertical stripe problem

    Hello I am John and I am restoring an Sega Outrun upright Arcade, you can find some pictures from the progress so far in my introduction topic: http://www.aussiearcade.com/showthre...4-Introduction

    Unfortunately I've got some problems with the game which I haven't solved so far and I really would like to have some help on solving these problems.
    The problems are:
    - Stripes in the clouds, but also stripes in the music selection screen. The C.R.T. Test does show these stripes too...
    - The right road data is not good, as you can see in the pictures attached the road at the right site looks weird from the start, and on the fork in the end of the stage where you can choose to go left or right the right road is not visible at all, however you can steer to the right there and drive through the grass to get into the stage which is on the right...

    Tried so far:
    - Removed the EPROMS and cleaned everything with a brush (it didn't look really dirty before, but had to try something)
    - Replaced all capacitors on both pcbs (I haven't done anything on the monitor yet as I think that the problems are PCB related)

    I am not so experienced with fixing these kind of problems therefor I would love to receive a "step by step" how to ��
    My idea for the next thing to do was to test the roms with an Eprom programmer and compare them to the MAME data, but unfortunately I don't got an Eprom programmer.
    Before I buy one (any recommendations?) I think it is smart to first test all the things which could cause these problems. But what, and how is the question...

    Thanks in advance, your help is really appreciated!


    1a stripes.JPG1b stripes.jpg1c test with stripes.JPG2a road data.JPG2b IMG_6118.JPG2c test.JPG
    Last edited by Arcad3; 26th November 2016 at 04:26 PM. Reason: Oops, I forgot to attach the picture :-)

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    My Twitch stream - twitch.tv/bigredbird1

  3. #3
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    To be honest your issues are almost certainly logic ICs or RAM faults. Even though the RAM tests pass you can't really put too much trust in the onboard tests, it's also quite common for the test to only test some of the RAMs and miss others.

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    That sounds great as it gives me even more hope that what I am doing right now will fix it!
    So far I had removed all chips and "cleaned" them with a brush, but then someone learned me about corrosion on chips and a glassfiber pen...
    Look how this Eprom looked for example, and what the current status is.... 😄

    15178058_1273147896092239_1136224607506472410_n.jpg

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    check the interconnectors are all the way in, I was having similar problems on mine and that was the issue

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    I have cleaned all eproms and had extra attention for the interconnectors when putting the board back in the machine, but unfortunately it didn't solve the problem.
    I've also measured the eproms from the top board and they all receive 4.95v

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    Update:
    IC48 and IC29 are resoldered as it seemed that some legs were not connecting... Unfortunately this didn't solve the issue of the road.
    Am I right that IC48 (and IC 47) is for the right part of the road and IC29 (and IC11) handles the left side of the road?

    Also I would like to know if it's save to turn the machine on while one Eprom is removed from the board (To test which one causes the trouble).

    THANKS!

    ic11_29.pngic47_48.png

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    Congrats on your OutRun pick up. Looks like you have a US machine. I wish I could help with the problem but unfortunately I have no expertise with the board, in fact I have an issue with mine too. See below as mine has not Road markings and the sky on some stages does not show the colours correctly.

    I'm planning on sending mine to Retroclinic in the UK after Christmas who specialises in OutRun boards. Maybe we could send them together to save on postage?

    Anyway that's my plan. I've done similar things like clean EPROMs etc but it's no good in my case as I've been told it's probably a buffer or RAM fault, but also could be the tilemap custom chip, which would be bad news as they're not available, unless you scavenge them from another board.

    I'll follow this thread and see how you go.

  9. #9
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    Hi, thank you for your reply. According to your problem, have you tried replacing Eproms? As "sky on some stages does not show the colours correctly" sounds to me like the code on the Eprom became corrupted... I don't know if that's possible, but if it was a bad connection or a component then I would think you would have had problems with the sky in each stage... Like in missing the road markings...

    So far I have only cleaned all socketed chips, therefor I will first clean all soldered chips too as I did see corrosion on the RAM Chips on the top board. �� But I am out of fillings for the glass fibre pen so I need to order some first...
    When it still doesn't work after that point my next step is to get a Logic Probe to test the chips (https://www.youtube.com/watch?v=PbFqZk9Pyfg) but I do need the datasheets for each chip then to know which result is normal. So far I only got the datasheet from the 27256 (eprom) http://www.alldatasheet.com/datashee...TEL/27256.html

    But I am also considering an eprom tester and / or eprom programmer.... and then compare my eprom with the original code from mame.
    But first I need to learn more about these things. ��

    So for now I won't send my board to a company, I still got hope ��
    It's a pity that you live on the other side of the world... else we could have easily swapped eproms to test things out :-)

  10. #10
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    Good news! I have cleaned all soldered IC's with a glass fibre pencil and made small but motivational progress with it as the stripes on the left are gone!
    I've made a video. The upper video is the "before" video and the one beneath is the "after" video.
    Focus on the stripes through the left side of the road and the crowd on the left.


    Even though I have measured that the signal through the road EPROMS (10186 and 10185) and sockets is good.
    They are still suspicious to me as when I pulled them out again I did see a little bit of dirt on the legs again... which makes me think that dirty sockets can be the issue.

    Also I have removed two small socketed ic's (one on each board) which I didn't remove before as they were really stuck into the socket and I was afraid to break a leg by removing them.
    Those legs were all black from dirt... so who knows, one of those might also be the reason that the stripes on the left are gone. But my feeling says it's dirt in the sockets of 10186 and 10185

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