It costs money to provide this information. We do in-home pinball repair in Michigan. All pictures and text are by Clay Harrell, except where noted. IF YOU HAVE NO EXPERIENCE IN CIRCUIT BOARD REPAIR, YOU SHOULD NOT TRY TO FIX Dungeons and dragons basic set 1977 pdf OWN PINBALL GAME!
Many of the ideas in this repair guide are not original. Lots of people contributed to this document, and I just want to say, “thanks! Below are a list of the resources used in the development of this guide. If this is the case, and an idea is here that was originally yours, please notify me and I will make sure to give you credit! Little experience in fixing pinballs is assumed. Basic electrical knowledge is helpful, but not necessary.
Bally 6803 games absolutely require a game manual. The “register” system of adjustments and audit unfortunately make fixing, diagnosing and adjusting these games impossible without the game manual. So don’t be cheap, just get one! See the Parts page for recommended sources of a game manual. These specialized electronics tools are needed.
Radio Shack sells fuses for a decent price. Slow-blo fuses are known as MDL fuses. Fast-blo fuses are known as AGC fuses. These last 6803 games still used the Bally 6803 CPU board, the two “low res” nine segment 14-digit alphanumeric displays. D-11581, and a small interface board which allowed the 6803 CPU board to talk to the System11 sound board.
Williams also used a system11 50 volt flipper power supply board. Getting Started: Introduction to Bally 6803. Bally’s 6803 system, used from 1985 to 1989, incorporated some unique features and designs that differed from the other pinball manufacturers. A concept that never really worked well, but that Bally obviously thought was a great idea, was the keypad input. This allowed one SCR driver to potentially control two devices. As Clive Jones describes, there’s a 43 volt AC secondary transformer line that’s center tapped to give two 21.
5 volt AC secondaries were wired directly to the flash lamps and fed as two ‘sets’ into the CPU board. The two sets would share a SCR lamp drivers. There are a total of 19 solenoid driver transistor across the top edge of the CPU board. Transistor Q7, the right most transistor in the line, is used for the flipper relay, and the other 18 are for devices on the playfield. NTE263 variety, which can be replaced with the more robust TIP102 transistor. Bally also incorporated some money saving ideas into this series of machines.
For example, the front door area of the lower cabinet were all the same with generic black paint and a “start game” sticker around the start switch. Another Bally cost saving idea was the use of “Low res” alpha-numerics displays. This saved money as less expensive displays could be used, less display logic circuits were required, and less programming was needed. 6803 Control Board, and lower right is the power supply board. The boards in Atlantis, which was after Williams bought Bally. CPU board through a small board to the right of the sound board.