have you checked the dip switch settings in the manual to what has been set on the mpu board?
(Topic ID: 329732)
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Space Invaders
Bally, 1980
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is the external battery connected to the mpu board?
sorry, not sure on your reply of the dip switches not releasing?
seeing as you just got it, I'd personally start with replacing the rectifier board.
looking in the manual dip switches 6 & 7 should be on to reward a replay which would result in the credit knocker being used and an extra ball awarded when you go in the side lanes when extra ball is lit.
looking at your mpu both these switches are off.
to check the credit knocker try the solenoid test via the red button switch on the inside of the front door.
could also be that the game is a Bally, one that uses a -35 mpu and the game has an early Stern mpu board in it and the jumpers may not be correct?
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