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  • Lunar Lander Repair help needed

    Hi Guys

    I have a semi working LL PCB

    I have 1 extra diagonal line 3" long that doesn't belong, and the screen is jumpy.

    I am going to replace a few sockets first, but may need some help after that.

    This will be a bit similar to an asteroids board

    (The cab is tested, on an asteroids PCB and checks out by the way)

    Anyone got any ideas?
    Thanks
    Regards

    Dez

    DSB Electrical
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    Another AA Visitor. Stay a while, stay FOREVER!

  • #2
    I found this info, may be similar fix here (Thanks Daics for the link)

    10. Problem: Diagonal line emanating from one asteroid.

    Fix: Use a faster EPROM (300ns) for location N/P3.

    11. Problem: Display only visible in a very narrow vertical band in centre of screen, some activity can just be seen in the band (revision 04 board).

    Fix: TL082 op amp at C12 had been removed, as well as the two capacitors at C98 and C119 (220 pf radial lead epoxy dipped 100V Mica capacitors). Replaced.

    12. Problem: Onscreen objects and text consistently flick between normal size and about four times larger, also extra spurious lines and explosions.

    Fix: Replaced LS175N at M7 ? pin 6 was stuck high, pin 7 was stuck low

    13. Problem: Game played but nothing on the screen except for a general glow that varied as the game was played blind, X and Y outputs were erratic

    Fix: 7915CT voltage regulator at VR2 was bad ? replaced

    14. Problem: Corrupt graphics ? in game mode all graphics were split down the middle (horizontally) and the two halves were then drawn besides each other. In test mode, only two vertical lines and a diagonal line were visible (revision 04 board)

    Diagnosis: Pin 11 of the 74LS32 at B9 was stuck High, but replacing this IC didn?t fix the problem. This is the LDSTROBE signal that connects to pin 11 of the 74LS191?s at C9 up to J9, which were all of course also High. Used a logic comparator and saw that this highlighted the 191 at C9 as being faulty

    Fix: Replaced 74LS191 at C9
    Regards

    Dez

    DSB Electrical
    DSB Electrical Facebook
    VAPS
    Vector Monitor Repro Parts
    Amazing Arcading Facebook Page

    Another AA Visitor. Stay a while, stay FOREVER!

    Comment


    • #3
      nice find, another one for bookmarking.
      If it isn't broke then don't fix it!

      Comment


      • #4
        Well Done Dez !

        LL is a Classic
        Pinball, Its an Addiction

        Comment


        • #5
          I'm happy to look at your PCB if needed Dez.

          Regards,

          Johns-Arcade.

          Comment


          • #6
            Originally posted by Johns-Arcade View Post
            I'm happy to look at your PCB if needed Dez.

            Regards,

            Johns-Arcade.
            That would be fantastic John, Thank you

            I accept your kind offer.

            I still have your address, so I'll box it up and send it off.

            Cheers mate

            PS Do you know who changed my sub-title under my user name? LOL
            Regards

            Dez

            DSB Electrical
            DSB Electrical Facebook
            VAPS
            Vector Monitor Repro Parts
            Amazing Arcading Facebook Page

            Another AA Visitor. Stay a while, stay FOREVER!

            Comment


            • #7
              Originally posted by dezbaz View Post
              That would be fantastic John, Thank you

              I accept your kind offer.

              I still have your address, so I'll box it up and send it off.

              Cheers mate

              PS Do you know who changed my sub-title under my user name? LOL
              No problem mate, it may take me a little while to get to it (as usual ).

              No mate, I don't know who changed your sub-title and only noticed it when you pointed it out

              Cheers!

              Johns-Arcade.

              Comment


              • #8
                It was Daics, the scalliwag 5000 vbux less in his wallet LOL

                Hey John
                Can I send you my Battlezone PCBs in the package for testing also?

                The red lights come on but a black screen is present. . .

                It would be nice to rule that out, (if possible)
                Last edited by dezbaz; 11th August 2009, 09:45 PM. Reason: Auto Merged Double Post.
                Regards

                Dez

                DSB Electrical
                DSB Electrical Facebook
                VAPS
                Vector Monitor Repro Parts
                Amazing Arcading Facebook Page

                Another AA Visitor. Stay a while, stay FOREVER!

                Comment


                • #9
                  Originally posted by dezbaz View Post
                  It was Daics, the scalliwag 5000 vbux less in his wallet LOL

                  Hey John
                  Can I send you my Battlezone PCBs in the package for testing also?

                  The red lights come on but a black screen is present. . .

                  It would be nice to rule that out, (if possible)
                  That's fine Dez, send them over.

                  Cheers!

                  Johns-Arcade.

                  Comment


                  • #10
                    When this baby is going cant wait to see it. dezbaz this has to be one of my fav games such a simple idea but so challenging after 20 pots there is nothing better then playing this on a nice monitor all white and crispy ohhh just gave myself goose bumps
                    John nice offer to have a look at it
                    The best action is wrist action!!!!!!

                    Comment


                    • #11
                      Originally posted by Davefjedi View Post
                      When this baby is going cant wait to see it. dezbaz this has to be one of my fav games such a simple idea but so challenging after 20 pots there is nothing better then playing this on a nice monitor all white and crispy ohhh just gave myself goose bumps
                      John nice offer to have a look at it
                      The offer is still there, when it's finished Dave
                      Regards

                      Dez

                      DSB Electrical
                      DSB Electrical Facebook
                      VAPS
                      Vector Monitor Repro Parts
                      Amazing Arcading Facebook Page

                      Another AA Visitor. Stay a while, stay FOREVER!

                      Comment


                      • #12
                        I swapped everything else, IE: from the game board, the chassis, the power brick, regulator

                        It ended up being the yoke, on the monitor
                        Regards

                        Dez

                        DSB Electrical
                        DSB Electrical Facebook
                        VAPS
                        Vector Monitor Repro Parts
                        Amazing Arcading Facebook Page

                        Another AA Visitor. Stay a while, stay FOREVER!

                        Comment


                        • #13
                          Originally posted by dezbaz View Post
                          I swapped everything else, IE: from the game board, the chassis, the power brick, regulator

                          It ended up being the yoke, on the monitor
                          I had to re-read the whole post to remember the problem Dez.

                          Do you have a spare yoke?

                          Regards,

                          Johns-Arcade.

                          Comment


                          • #14
                            Holy crap 2009 to 2016 are you sure your not on contract ?????
                            The best action is wrist action!!!!!!

                            Comment

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