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  1. Space invaders preservation

    I have a Midway SI
  2. Midway Space Invaders - finding a short

    Okay, instead of the linear PS, I'm going to connect a modern SMPS and see what happens. This will rule out a PS issue. Next I'm going to replace all the tantalums on the board and see what happens then. As a last resort, I'm going to start cutting traces. I'll post my findings here when I'm done.
  3. Midway Space Invaders - finding a short

    No, it looks like someone marked all the 5V pins in silver and GND pins in gold.
  4. Midway Space Invaders - finding a short

    Here are two pics showing the DC voltage on the 5V rail with power off and then with power on. When power is turned on, the voltage jumps to 1.7V momentarily and then drops to .56V
  5. Midway Space Invaders - finding a short

    A continuity test shows no connection between 5V and 12V and 12V with -5V. But looking at the picture you quoted from me above, it certainly looks like the blue connector was plugged in wrong. It might have been and that would be on me and being careless. However, after seeing your comment I...
  6. Midway Space Invaders - finding a short

    From a visual inspection, the connector pins line up with the edge pads. I also did a continuity test on adjacent pins and there is no shorts between any of the pins. All four electrolytic caps on the main board have been replaced with new ones. About four tantalums have been replaced on one...
  7. Midway Space Invaders - finding a short

    Without the PCB plugged in: 52 Kohm With the PCB plugged in: 100 ohms I ran through all the items in the checklist found here and everything checked out fine. The +5V edge trace goes to pin 21 on the PSU The two GND edge traces goes to pin 20 and 24 on the PSU and the 3rd GND wire goes to the...
  8. Midway Space Invaders - finding a short

    This is the approach I took on a short I had on another board. There was a short to ground and by cutting traces I was able to narrow it down by one half of the board, then by one quadrant, then by one row. The only downfall is repairing all the cut traces afterwards.
  9. Midway Space Invaders - finding a short

    Sorry, should have mentioned. I have the boards, harness, power supply and iso-transformer on the bench so nothing is attached.
  10. Midway Space Invaders - finding a short

    The resistance between 5V and GND with the board unplugged is: 62 Kohm Unfortunately, I do not have a variac but I do have a thermal camera. When the main PCB is plugged in, the main board does not light up anywhere, but the power PCB does by the four resistors next to the +5V adjustment pot...
  11. Midway Space Invaders - finding a short

    I'm trying to diagnose the main PCB on my Midway Space Invaders. The linear PS is working fine and the +5, +12 and -5V rails are all within spec. As soon as I connect the harness to the main PCB, the 5V rail drops into the mV range. The +12 and -5V rails are fine. From the Midway 8080 Test...
  12. Commodore C2N Datasette

    If nobody laid claim to this, I would be interested. Thanks
  13. WTB: Universal joystick for dedicated Mr. Do! Cabinet

    No, no raised lettering on the dust cover. Just a generic looking one.
  14. WTB: Universal joystick for dedicated Mr. Do! Cabinet

    Here's a partial disassembled pic.
  15. WTB: Universal joystick for dedicated Mr. Do! Cabinet

    Here are some pics still in the cabinet.
  16. WTB: Universal joystick for dedicated Mr. Do! Cabinet

    Let me pull it from the cabinet and take pics.
  17. WTB: Universal joystick for dedicated Mr. Do! Cabinet

    I can probably sell you the one I have in my Universal Space Panic cocktail. Keep in mind that the shaft is shorter in the cocktail than in the upright. The reason I might be willing to sell mine is because it only came with one joystick. I will probably buy two generic joysticks for it anyway...
  18. WTB: Midway Space Invaders Power Supply Board

    Looking for an original and working power supply board for my Midway Space Invaders upright cabinet. If you have one in working condition and are willing to sell it, send me a PM and let's make a deal. Shipping would be to Canada. Thanks for looking.
  19. Space Invaders Restoration

    Here's the Programmer I have and the garbage I'm getting on the monitor.
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