Arcade Collecting > Pinball

Solenoid Driver Board Problems

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gajaman:
Karetaker - the coils only fire during gameplay and always at the same time (ie when the left thumper bumper is hit the right slingshot fires. The right thumper bumper and the single drop target just don't fire at all. I don't think the game rom is a problem as the MPU is a new replacement Ultimate board.

smartbomb2084 - The cabinet is completely self contained with a single power lead from it. It runs mame with Party On as the front end. It has an i-pac inside as the interface. Like the sound of your Robotron with mulitple boards - great solution for a Defender fan.

Thanks for the tip about using original boards for my Defender project. They rarely come up in the UK and are very expensive when they do. Also I'd have to abandon my flat screen idea which would make the cabinet full size and not thinned down undoubtly removing all goodwill from my wife about the project! That could be a deal-breaker.

I'll desolder and resolder the J4 completely. I think the flippers stopped in game over mode on the fuse blow board. I'll check this out later to be sure.

I'm not sure about the connector plugs, are you referring to the connectors to the boards or connectors in the wiring?

smartbomb2084:
I am talking about the plugs that carry the wires to the pins (jacks) on the boards.  I am not real sure where to go next.  Sometimes it is a bit hard to diagnose certain problems without being able to see the game in person.  The playfield fuse only has the playfield coils connected to it on one side and the flippers on the other. If the fuse is blowing it almost has to be one of the coils or a bad transistor.  Have you checked the diodes that connect to the transistors on the board?  Have you checked the pre-driver ICs U1, U3, and U4?  On the SDB that blows the fuse does it power the displays properly?

gajaman:
I desoldered and removed the J4 connector cleaned it up and then resoldered it. Same result I'm afraid.

The plugs are white plastic with wires that appear to be crimped in the holes but I can't see how they are crimped.
I haven't checked the diodes on the fuse blowing board or the ICs U1,U3 or U4. Presumably I can check the diodes with my DMM? Do I need a logic probe to check the ICs or can I do this with my DMM.

I'll have to check the displays on the fuse blowing board. I can't remember if they work, I think not but I'll need to check.

Thanks for continuing to stick with this!

 

shardian:
This really sounds like a wiring/switch matrix issue. The thumpers and the drop target are all tied to the same pin on the J2 connector. However, the slingshots and upper flippers are also on that pin. Any problems with those? Maybe you have a bad diode somewhere causing a jump in the matrix? You can bypass the diode on the problem switches to see if the switch registers correctly then.

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