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  • Page 2 of 2 FirstFirst 12
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    Thread: Outrun ic95

    1. #11
      Mikie is offline Juno First
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      I borrowed a cheap probe worked fine , if $300 is cheap that is
      SN74ALS138AN is available at element14 for $1.55, can swap or try piggyback method (I haven't tried this yet)
      You can also purchase chip and ram testers

    2. #12
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      Quote Originally Posted by Arcad3 View Post
      Ooooh I didn't know that! How do you test ram then?
      Scope, piggyback or by pulling them.

      Quote Originally Posted by Arcad3 View Post
      On mine there's know brand written, it only says LP-1. Since the probe looks similar to the Eistar I guess it is...
      It was a cheap probe... Don't they meassure the right values?
      Levels aren't conform to the TTL or CMOS norm.

    3. #13
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      Outrun ic95

      Quote Originally Posted by Mikie View Post
      I borrowed a cheap probe worked fine , if $300 is cheap that is
      SN74ALS138AN is available at element14 for $1.55, can swap or try piggyback method (I haven't tried this yet)
      You can also purchase chip and ram testers
      That is where I have bought my als138an!
      I have once tried piggybacking some bitcounters but that didn't work. After I desolderered and replaced the bitcounters it did work.

    4. #14
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      Quote Originally Posted by Ace` View Post
      The skinny 6264 rams on Outrun pcbs have a high failure rate, both 68k cpus use them as work ram. Replacement skinny rams aren't to easy to find these days either.
      Thanks for mentioning the specific ram, I will hunt on it!

    5. #15
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      My Outrun is booting again!
      There was no connection between pin 37 of the B connector to IC123 pin 3!

      For the monitor... the fuse was broken...
      I have now isolated the metal plate of the cabinet monitor area with rubber as the monitor chasis was laying loose on the metal plate of the cabinet and already hit the side one time with a huge spark as a result... now that's save.

      Only got one problem with the monitor, the neckboard is coming loose from the tube... so the monitor does not light up unless I keep pressure on the top of the neckboard with an isolated tool.....
      I am going to build a monitor discharging tool so I can have a closer look.

    6. #16
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      Quote Originally Posted by Arcad3 View Post
      My Outrun is booting again!
      There was no connection between pin 37 of the B connector to IC123 pin 3!

      For the monitor... the fuse was broken...
      I have now isolated the metal plate of the cabinet monitor area with rubber as the monitor chasis was laying loose on the metal plate of the cabinet and already hit the side one time with a huge spark as a result... now that's save.

      Only got one problem with the monitor, the neckboard is coming loose from the tube... so the monitor does not light up unless I keep pressure on the top of the neckboard with an isolated tool.....
      I am going to build a monitor discharging tool so I can have a closer look.
      You can try bending the pins slightly on the tube so that the neck board is tighter and I have also seen some with a small dob of silicone to help hold them still

    7. #17
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      Quote Originally Posted by Boots View Post
      You can try bending the pins slightly on the tube so that the neck board is tighter and I have also seen some with a small dob of silicone to help hold them still
      Thanks! I guess I'm going for the bending option.

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