Midway A082-90411-C000 power supply schematic wanted. (GORF, Wizard of War, Space Zap, etc)

RobotWorkshop

Active member

Donor 2025
Joined
Mar 28, 2017
Messages
447
Reaction score
158
Location
Michigan
Does anyone have the schematic for a Midway A082-90411-C000 power supply? I can find references to a A082-90411-A000 but not the -C000 version.

It looks like many -A000 have a few components added afterwards as a mod on the 3532 chip which don't seem to be on the -A000 schematic. It looks like the -C000 version added those on the PCB.

I rebuilt a -C000 that was in a Space Zap but having issues with the 5V section. I can only adjust down to 5.8V which is too high. Finding the correct schematic with correct values will help.

Attached pictures that show the -C000 variation,

Has anyone run into this before?
 

Attachments

  • 20250924_195430.jpg
    20250924_195430.jpg
    839.2 KB · Views: 8
  • 20250924_195441.jpg
    20250924_195441.jpg
    1.2 MB · Views: 8
  • 20250924_195446.jpg
    20250924_195446.jpg
    1 MB · Views: 8
Last edited:
Here are images of the -A000 version of the board with the extra parts added.
 

Attachments

  • 20250924_200842.jpg
    20250924_200842.jpg
    581.2 KB · Views: 4
  • 20250924_201140.jpg
    20250924_201140.jpg
    832.4 KB · Views: 4
Were there any tech notes from Midway on these Power Supplies? Should be the same supply in GORF, Wizard Of War, Space Zap, etc.

It looks like a 100 ohm pot sits between a 560 ohm and 510 ohm resistors to adjust the voltage. Maybe they changed values in a tech note
 
Last edited:
Any ideas why the 5V may be running high? I could probably reduce the value of the 560 ohm and 510 ohm resistors and use a larger pot for more range but that seems like a hack and don't want to go there unless I have to.

Hoping to get this resolved this weekend so the game can be used at a charity event at a local arcade this coming Monday,
 
John at Flippers.com found the schematic for the -C000 version in a Wizard of Wor manual. I shows the correct parts layout for the board I am working on.
 
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 10ohm resistor like Atari. Maybe a jumper to set the initial voltage and then fine tune after connected? Is there a sense mod for Midway like Atari?
 
Back
Top Bottom