Recent content by YellowDog

  1. YellowDog

    Williams Linear Power Supply Help...

    When working on the power supply, never plug the pcb boards into it. It is a linear power supply, it will work without a load. It sounds like Q4 is shorted. Remove it. You can leave the other components in. Check the top pads under the large bridge rectified. When desoldering the old...
  2. YellowDog

    revenge of the Defender PSUs

    Common issue on all Williams power supplies is having the through hole plating not stay with the board when removing the big rectifiers (BR1, IIRC). There is just too much metal between the big copper pads on the top and bottom of the board and the big wires. Most pencil soldering irons can't...
  3. YellowDog

    High Score Reset on multiple Williams games

    If you replace the linear PS with a switcher, you need to run the ground wire that attached to the PS board to ground to make the door switches work. It is the small connector that also powered the coin door lights. Clean the contacts on the battery holders and verify that you are getting...
  4. YellowDog

    4/8 way joystick identification

    With some versions it depended on the plastic piece that contacted the switches. A square one would be 8 way and a round one would be 4 way (or the other way around). The Chinese Wico knockoffs came with both and a curiously worded instruction sheet explaining which was 4 way and which was 8...
  5. YellowDog

    How the F.B.I. Made 'Winners Don't Use Drugs'

    I see those splash screens all the time on the machines at The Preserve and wondered about the back story. Thanks for posting. ken
  6. YellowDog

    Maintaining your marital vows.......

    You can have a basement in Texas, but here in Houston, sooner or later it will be an indoor swimming pool. :( ken
  7. YellowDog

    Wives -vs- Arcade Games ~ What's the score?

    My wife was fine with it until the "Keepers" numbered 27 and I started eyeing the blank wall in the bedroom...:eek: She is much happier now that I am keeping most of them at The Game Preserve. She still doesn't have all of the living room back (1 pin and 1 slot machine) and the sunroom is...
  8. YellowDog

    Williams Defender Power Supply issue

    Two things to try. 1) try soldering the top pads to the leads. The pads are plated through hole so that the top pads are connected to the bottom pads. When removing the big bridge rectifier the through plating often gets torn out with the leads. When this happens you must solder the top pads...
  9. YellowDog

    Joust RAM (?) Issues...Getting Close...Chip Voltages?

    Is this a rev-D motherboard? It will say on the board near the battery holder. Rev-Ds also have the small red inductors near the power connector. If so, check to make sure you didn't break the wire in the -5V inductor. It is real easy to do. ken
  10. YellowDog

    Joust RAM (?) Issues...Getting Close...Chip Voltages?

    You already have a switching power supply (the black box), but it looks like the original power supply board & heat sink assembly in is there. There are several people here that rebuild those, if you don't feel up to the challenge. If you are not fairly handy with wiring/soldering I would...
  11. YellowDog

    Q*Bert Resetting - Unplugged Knocker - It Stopped

    Unless you dump the 400W heater and put in a JROK multi-Mylstar. :D ken
  12. YellowDog

    SOLD - GAME Comet (Williams) Full LED Lowered Price!

    I don't know why this title gets no love. It is a fun machine full of little Python touches (love the ice cream cone on the back glass). People enjoy the heck out of mine. Anyway, GLWS. ken
  13. YellowDog

    Defender video: rolling corruption band

    Try a different monitor and see if the distortion follows. ken
  14. YellowDog

    Your Basement/Garage/Barn Arcade Names!

    When I had most of my games at home, it was 'The Whole House Arcade', an homage to the Whole Earth Catalog. Now most of them are at The Game Preserve. ken
  15. YellowDog

    Defender PS rebuild yields low +5

    You can get the bridge rectifiers from GreatPlainsElectronics.com. GPE carries 3504W (35Amp 400V wire leads). Last time I looked, they still had some of the steel clad ones. Ed also carries the 18,000 mfd caps to replace the big cap on the board. When you replace the big bridge...
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