(Topic ID: 234391)

Bally Supersonic solenoids-explain this "fix"


By Pinbee

9 months ago



Topic Stats

  • 6 posts
  • 4 Pinsiders participating
  • Latest reply 9 months ago by Pinbee
  • No one calls this topic a favorite

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#1 9 months ago

Please keep it simple to match my understanding of these, I'm mainly an EM guy.
After playing fine, mid session, wouldn't kick out a ball at start of game. On test, only flippers, gate, and coin solenoids fired. Good voltage on playfield at non-firing solenoids, grounding transistors activated them. Good readings on test points on SDB.
I recalled reading somewhere that the sound board could interfere with solenoids, so unplugged that, no change, but after plugging it back up, the solenoids are working. Does this mean just a bad connection? Any further diagnostics I should do? Should mention that the sound board doesn't play the correct tunes, but somewhat random in a minor key. The sound has changed from when I first got the game.
Thanks for any suggestions.

#2 9 months ago

I would repin J4 on the mpu, and reflow the solder on the header pins. Then move to the sound board and do the same. The fact that the sound board doesn't play the correct tunes indicates a problem either at the MPU where the signal leaves or the sound board where it comes in. Gotta address both connectors and headers to make sure.

#3 9 months ago

I sent the MPU out for an overhaul when I first got the game and replaced the connectors to it, so will assume the trouble is at the sound board. Not sure my soldering skills are fine enough to reflow the header pins, but could give it a try. What is a good replacement sound board?

#4 9 months ago

bad connector between mpu j4 and driver j4.

female side of mpu j4 gets wasted by batteries. male side of driver j4 gets cracked solder joints from no plated through holes (most driver board versions).

#5 9 months ago

To clarify, there are 2 types of solenoids on a Bally game. Momentary and continuous. From your description the continuous solenoids are working but the momentary are/were not.
The address lines for the momentary solenoids are shared by the sound board. There is a another line called the solenoid bank select. That line determines if the address is a sound or a momentary coil. If that line goes open or shorts you will only get sounds or coils. Sounds like that is your problem.
This is usually caused by a open solder connection or loose wire on it's pin. Follow Xenons advise above and make sure that wire is solid all the way through.

#6 9 months ago

Thanks, guys, for the info. As time permits I'll check this and report back.

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