Been working on the EBD I picked up this month for a few weeks now and down to a few issues that I am seeking guidance on. I just got a brand new replacement MPU, so I'm assuming (hoping) it is not an MPU problem with either issue:
(1) Once in a while (although happening more frequently lately), the voice will announce that the one ball has been made even though the target has not been hit and remains up. It turns the one target light off and lights up the one ball in the rack even though the target is still up. On the next ball, when the targets are reset, the game will drop the one ball as if it was made on the previous ball. This can happen at what seems like a random point in game play from as soon as the moment one the ball is kicked into the plunger lane or at various other points when the ball is in play. So, the game has some issue that makes it think that the one ball target was made when it was not. Is this likely an issue with the switch for the one ball target that needs adjusting (e.g. closing due to being too close together), a connector/wiring issue or something else? I checked using the test menu and the one ball switch does not show up as being closed, but it is possible it is open, but is it possible the contacts are close enough that it closes randomly due to ball action that shakes the playfield enough to close the open switch temporarily and signal a shot made to the MPU?
(2) When I make either the three ball or the four ball, it will turn off the correct corresponding light for that ball target (either 3 or 4 target made) and leave the other target light lit as it should, but will light up both the three and four ball in the rack. It does not count the ball that was not made in the bonus count, so the game recognizes the other ball target was not made. I assume this is most likely a wiring issue under the playfield or in the connector that is causing both to light when only one should.
Any help would be appreciated. Thanks.