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Help with Taito Space invaders
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Kevin77
Hello everybody,
I'm doing my first arcade repair, it's a original Taito L shape space invaders board set.
Main board is a AA017742A the daughterboard is a SV070014A / SVN00003A.
I have a single testrom that should go in position H on the board working but only on position S (first rom slot on the board next to the SN74154).
Also have the TV version of 4 roms which had the test bild into the romset. Both test procedures work and say all ram passed, also all of the sounds work. But....this is the one i don't get, if i flip switch 4 on the board (rom test off) en try to boot the game i get a all black screen with the letter D in the middel.
I tried to change the ram on D, then i get another letter and so on untill i get back to the letter D again? Could someone explain this to me and where to look for a error/ short on the board.
What i do know is that if i logic probe the roms the first three roms show activity on all lines exept for rom 4 which had stuck lines on pins 18,20 and 21. I'm running 2716 roms on adjucted sockets, files on roms are double burned.
I will post a picture of the stappings im currently using. Hope some of the space invaders experts can help me out on this one and save another peace of history.
Thank you for all your help.
kind regards, kevin.
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