Recent content by RobotWorkshop

  1. Midway Extra Bases odd board issues - Midway Card cage system (Gorf, WoW, Space Zap, etc)

    I have a Midway Extra Bases that has been running ok. It was definitely overdue for a Power Supply rebuild and a re-cap on the monitor. While waiting on the capacitor kits I decided to pull the card cage to wash those boards and go through them. Plan on adding the clip on heat sinks on the...
  2. Midway A082-90411-C000 power supply schematic wanted. (GORF, Wizard of War, Space Zap, etc)

    When I was doing the initial adjustment of the 5V line I don't have any load on the supply. Didn't want to risk damaging the custom chips on the boardset. But I noticed these boards have a sense line similar to the Atari. Does that need to be bypassed for the initial adjustment? Looks like a...
  3. G07 CBO problems

    Any Neck glow? Can you check your B+ again? Do you have power at the monitor plug?
  4. More Baby Pac-Man issues... :(

    It looks like the leads on the 40-pin video IC have turned black with oxidation. If so that needs to be cleaned and reseated. Maybe at some point the DIP socket replaced as well. I think that chip runs a bit warm. I added a clip on 40-pin DIP heat sink on mine. Do you still have your...
  5. More Baby Pac-Man issues... :(

    Watch FB marketplace for Baby Pacman. There have been several that have showed up this year.
  6. TEC TM-623 horizontal and vertical centering?

    Do any of you know how to adjust the horizontal and vertical centering on a TEC TM-623 monitor? I'm working on a pair of Atari Starship 1 games. Notice the picture seems shifted on one of them. Oddly enough it looks like it may have always been that way since the target sticker is also offset.
  7. Baby Pac Man Help

    It depends on the 5101 but with the Low power version I have had a game sit for over 6 months and it retained the data. Anytime it is powered for a bit recharges the capacitor. Values off 1F and 1.5F are often used but I have been using 4F and so far haven't left any game off long enough to...
  8. Baby Pac Man Help

    Definitely look at the MPU to see if there is any battery damage. The battery is by the 5101. It creeps up into the socket so the socket usually needs to be replaced. Also the 5101 chips do go bad. I test every one when working on a board. On the Bally MPU I typically install a 4F memory...
  9. 19V1001 are P277 and P292 boards interchangeable?

    That helps! Thank you. Just the confirmation I needed.
  10. 19V1001 are P277 and P292 boards interchangeable?

    I've seen 19V1001 black and white monitors that use a P277 and others with a P292 board plugged onto the chassis. Trying to find out if those boards are interchangeable or if there are differences on the main chassis where it makes a difference which board is installed and has to match. If...
  11. Motorola XM 702-10 ,Atari Sprint 2

    On some of these old games I've had to check and rejuvenate the tubes. Several have small internal shorts that the old Heathkit CRT tester was able to clear.
  12. More Baby Pac-Man issues... :(

    I can't tell what MPU you bought. Normal Bally MPU boards are different. Baby Pacman and games like Grand Slam used the -133 which had a mod to swap out a resistor with a diode. A very important detail. If the replacement board doesn't have a configuration for the -133 then that will cause...
  13. More Baby Pac-Man issues... :(

    I have a spare clean perfect original driver board with the updates. But you don't need to buy another board. The originals are great. May just need a refresh and the updates done.
  14. More Baby Pac-Man issues... :(

    Can you post good pictures of your MPU and Video board? I had weird switch issues. Had a switch for a saucer gapped to close. Also had coin door switches disconnected and had my start switches wired wrong when I got it.
  15. More Baby Pac-Man issues... :(

    Have you done the updates to the driver board? There are a few jumpers that should be added to the back of the board. It is hard to tell from the video but how many flashes on each board? I recently got a Baby Pacman and got it running really well. It had all sorts of issues. I would...
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