Keypad keys are switch matrix crossings

Each keypad key joins one switch row to one switch column. Row 15: Game (column 3), Keyboard/Clear (6), 0 (10), Enter (13). Row 11: A, 1, 2, 3. Row 8: B, 4, 5, 6. Row 5: C, 7, 8, 9. Row 1: D, E, F, * (columns 3, 6, 10, 13 in that order). The D, E, F and * keys are not used by any known 6803 game.

Systems

• Bally 6803

Games

• Beat the Clock
• Black Belt
• City Slicker
• Dungeons & Dragons
• Eight Ball Champ
• Hardbody
• Heavy Metal Meltdown
• Lady Luck
• Motordome
• Party Animal
• Special Force
• Strange Science

Related tips

• Build a replacement keypad
• Centre pop bumper does nothing and doesn't score: spoon switch gap too wide
• No ball served and flippers dead after start: tilt switch closed, tilt lamp out
• Hitting the jukebox targets triggers several switches: blade touching its mount
• One target triggers several switches: switch blade shorting to its mount
• Switch matrix connector voltages under the test EPROM
• Flipper switch shorting into the lane change switch
• Why strobe 5 needs its jumper when it has switches

Source: Repairing Bally 6803 Pinball Games from 1985 to 1989, Clay Harrell (pinrepair.com)