The 6 amp diodes provide better heat dissipation. The -132 board uses 6 amp diodes at CR5, CR6, CR7, and CR8, while the -54 board uses 3 amp diodes. The -132 board is very similar to an AS-2518-54 rectifier board, but with a few modifications/improvements. This means that it is not necessary to install a fuse at F2. Since this game does not use any score displays (like normally found on a pinball machine), the +230VDC (190VDC unregulated) found at TP2 is not used. This game uses a Bally AS-2518-132 rectifier board, which is nearly identical to the standard AS-2518-54 rectifier board. The vidiot board can be tested for sound and video without needing the MPU. The sound section of the board uses one 2764 eprom at U29. The two boards are different enough to not be cross-compatible.įour 2764 eproms are used for the video section of the vidiot board at U9-U12. A modified version of this board named the "Vidiot Deluxe" board was used in Bally's second hybrid game, Granny and the Gators. Because this board is reasonably complex and unique, it can be a central point of failure in this game. This game uses a Bally AS-2518-121 Video board to display output on the monitor, output sound, and receive input from the control board's joystick and buttons. When the MPU is working properly, the lamps will turn on and off according to a specific sequence. If the MPU is not working or not communicating with the vidiot board, the driver board will still turn blink the feature lamps on and off haphazardly, but they will not be sequenced. If one of the SCR's fails, usually a pair of lamps won't respond and will either be stuck either on or off. This board is also found in Bally's second hybrid game, Granny and the Gators.Įach SCR in the lower left area of the board (marked as Q1 through Q28) is responsible for driving two lamps. This game uses a Bally AS-2518-107 combo board to drive both the feature lamps and the solenoids. (TODO: Include reason for this difference) Otherwise, troubleshooting procedures are identical to that of the -35 board. The -133 board's diagnostic LED displays 6 flashes, while the -35 board displays 7 flashes. The diagnostic LED flash sequence is slightly different on the -133 board than the -35 board. The MPU board can be re-jumpered to accept two 2732 eproms. A 2732 eprom at U6 and a 2532 eprom at U2. See the notes on this conversion process on the main Bally/Stern page. A -35 board can be converted to a -133 board and vice-versa by swapping a few through-hole components. This is nearly identical to the AS-2518-35 board, with a few minor differences. Baby Pacman gets its name from these prototypes since they were originally intented to be a "baby-sized" arcade game, when compared to full-sized arcade games. One of them is in Todd Tuckey's personal collection (owner of TNT Amusements). There were 4 or 5 half-height prototype games made. Baby Pacman is one of the few hybrid video/pinball games that were ever produced, and only the first of two hybrid games produced by Bally. 3.1.2 Playfield Schematic Labeling Errorīaby Pac-Man (Also written as: Baby Pacman) was produced in 1982 by Bally. 2.7.2 Game Does Not Eject Ball on Button Press in Pinball Mode.2.5.2.3 Feature Lamps Stuck On (In Pairs).
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