Arcade Collecting > Pinball

Solenoid Driver Board Problems

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gajaman:
I recently bought my first pin - a Bally Space Invaders.

I have problem with some of the coils firing at the wrong times or not at all that has stumped me.

The problem affects the single drop target and two of the three thumper bumpers. The drop target and one of the thumper bumpers wont work at all and the other thumper bumper fires the wrong coil. I have confirmed this in the coil test mode.

I have tested the wiring by grounding the transistors and this makes all the coils fire correctly indicating the wiring is good. I have also tested the transistors themselves with my DMM and have similar readings on all of them.

At this point I didn't know what to do next. I saw a replacement board on ebay and bought it as it was cheap and apparently 100% working.

This arrived yesterday and after checking I had 5v at TP1 I hooked it up with high hopes.

This board blows the 1amp fuse under the playfield as soon as the pin is plugged into the mains.

So, now I have one board that works fine except for 3 coils and one that blows the playfield fuse.

Any advice on where to go with either board next?

StephenH:
Here is some info for your pinball system:

http://www.pinrepair.com/bally/index1.htm#top

gajaman:
Thanks for the reply StephenH.

I've used the pinrepair guides a lot since I got the machine but having the read the whole section on solenoid driver boards I just can't find anything that would cover the under playfield fuse blowing as a direct result of the solenoid driver board. I know it's the board as the fuse doesn't blow when I plug in the other board which doesn't fire all of the solenoids correctly.

Help!

gajaman:
Thanks for the reply.

All of the coils have 43v at all lugs. The J5 connector looks ok and when I short each capacitor the correct coils fire making me think that the connector is ok?

Which leg should I cut (there are three) and what will this do?

The game does not have an expander board.

gajaman:
Thank for the help.

I snipped one leg of the capacitor next to the transistor that controls the single drop target on the solenoid driver board;



(The orange disk)

Unfortunately, this hasn't made any difference.

I don't think the problem is the MPU as this is a new ultimate replacement.

When you say "look at the schematics to see what's associated with the logic to handle those coils" can you elaborate at all? I've learned a lot so far about electronics but I'll need a bit more direction I'm afraid.

Thanks 

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