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  • Users: wugly
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  1. What’s One Arcade Game You Regret Selling or Passing On?

    I am about to do one now. Absolutely no room 3 games ago and I still have to sell and inversion table and repair a rescue 911 so I can't squeeze in a 150 dollar seawolf in good cosmetic shape but no monitor
  2. Found or No Longer Wanted WTB Cinematronics Space Wars Modifier Keycap #7

    might have to consider if it could be 3d printed
  3. Sawtooth on data bus

    nip a pin of your best guess and if you are wrong get it back close together and bridge it with a little solder
  4. K4600 c625 cap keeps bulging

    which board had the board marked backwards for a cap on top and correctly on the underside?
  5. Asteroids wild northern lights halo?!?

    have only seen problems like this twice. one was the monitor is improperly adjusted the other is that the transistor for the gain of the z axis had drifted out of spec. on the game board
  6. Space Invaders Duplicate Graphics

    not familiar with that scope. is the voltage set to 500 mv? I can't remember exactly but the signal should be closer to 7. is your probe set wrong for your scope. the frequency doesn't look right the shape looks close but I think the frequency setting on scope is distorting. there is no way...
  7. G07 CBO problems

    I usually use jumper wires since it is temporary and only during troubleshooting, otherwise it would not be a safe long term solution unless I came up with a permanent mounting
  8. G07 CBO problems

    for troubleshooting I always use circuit breakers. fuses after problem solved
  9. Congo Bongo died, pcb brings 5v down

    I learned from a guy repairing apples. have you heard of louis rossman
  10. Congo Bongo died, pcb brings 5v down

    If your fingers are as insensitive to temperature difference as mine then another method is to squirt a little alcohol on a chip and see how fast it evaporates. the hotter the chip the faster it evaporates.
  11. Armor attack help after shipping game - led on

    if it locks with steady 5 volts it could be a ram or rom problem. something dirty or jiggled loose?
  12. Armor attack help after shipping game - led on

    ac voltage above .5 and you have a lot of ac present so at times if you read 5 with dc you might only have 4.5. was giveing you the preliminary tests.
  13. Space Invaders Duplicate Graphics

    he said what it was earlier. thats how I knew which chip you were refering too. my rom board is aa017749 edit chip 3 on my board is a sn7442an message #11
  14. Armor attack help after shipping game - led on

    reading dc tells dc plus ac. if ac is too high then dc is lower. also check rom and ram legs cleaned
  15. Armor attack help after shipping game - led on

    when you tested it did you also set your meter for ac
  16. Space Invaders Duplicate Graphics

    to translate for @HudsonArcade he is showing you the schematic for a 2 board space invaders. you are using a 3 board taito. the control chips he is referring too are actually on the rom board aa017749 should be chip 9 for the what he has as b6.
  17. Space Invaders Duplicate Graphics

    haven't looked at in awhile but seem to remember a square wave around 7 volts. if they two sides don't look similar then they usually is what tweaks me to know it was bad at least one of them is good enough to get a image so if they don't look similar then one is bad. both are generated by...
  18. BURGERTIME : Is there a Free Play option ???

    another way is this https://www.easycoinup.com/products.html
  19. Space Invaders Duplicate Graphics

    the next idea is pin 17 on the ram chips. this pin gets a signal higher than the standard logic signal. I have never used a logic probe on it but have only used a scope which is immune to the higher voltage. there is a right bank and a left bank and if the select signal is fouled up how the...
  20. Space Invaders Duplicate Graphics

    alcohol wipe the chips to remove black ink
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