From Sega Retro
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Pro Bowler (プロボウラー) is a 1972 two-player electro-mechanical bowling game manufactured by Sega. The game is a mechanically animated manikin bowling game and basically a copy of Williams' Mini Bowl (8/70). Pro Bowler has a five-foot playfield length and scores just like regulation bowling. Relays in this Sega game are the enclosed and socketed variety. Note the drawing date on the schematics for Pro Bowler is 1972, but reportedly this game was made as late as 1976. Top glass size is 22" x 44.5” x 3/16” tempered glass. It uses one pinball 1 1/4" diameter glass.
The game has a few technical problem (aside from the usual manikin game troubles). One is the transformer is not as robust as American-made games. This is the problem for the G.I. (General Illumination, 6.3 volts). If all the bulbs are installed for the game, only about 4.3 volts is available. As bulbs are removed, the voltage goes up (indicating the transformer can't supply the necessary current to light all the bulbs!) Another problem are the relays themselves. The plug/socket arrangement can be trouble, as the male plugs on the relays turn brown and don't conduct. These can be cleaned though.