(Topic ID: 322655)

AFM Ball Launch Coil Fires on Power Up

By SFBP36

10 days ago



Topic Stats

  • 6 posts
  • 3 Pinsiders participating
  • Latest reply 10 days ago by phishrace
  • No one calls this topic a favorite

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#1 10 days ago

Hi all. This one has me stumped and I could use a hand on a new-to-me original AFM:

When I power the game on, the ball launch coil will fire twice in succession. It happens right after the lighting comes on, before the speaker tone sounds, and before the other balls are kicked out of the SOL scoop, saucer trough etc. It happens weather or not there are balls in the trough. It is also seemingly random. It usually does it but sometimes not, and I can't recreate the scenario in which it does not.

Thinking it was a switch matrix issue to do with the shooter lane switch, I replaced all the diodes on the switches in the corresponding row and column: shooter lane, right return (inlane), left outlane, left top lane, right top lane, ma"R"tian target, & center trough. The switches in the same column I have not messed with yet are: plum bob tilt, start button, & launch button. Could one of these be the culprit?

I cleaned and tested all trough optos.

However when I disconnect J212, J205, J206, & J208 from the CPU, the problem persists. That rules out a switch matrix issue, correct?

Thinking it may be a shorted coil, I swapped it out with the knocker coil (same type).

Otherwise the game plays and acts totally normal. No switch issues, no issues feeding & launching balls (also during multiballs)...

That's how far I've gotten, any help would be greatly appreciated. Thanks guys!

#2 10 days ago

I had this and replacing the game ROM fixed it.

However, I went through everything to figure it out including full restore to factory which was suggested to me first as well as verifiying the trough and shooter lane switches were all good and the coil wasnt shorted. But like you mine always fired twice.

Mine came off route and always did this. It sounds like yours has also done this as far as your know? Can you ask the owner you bought it from if it always did it?

Its been over 10 years so I dont remember if it always did it or sometimes did it. I think it always did it so yours could be different.

One thing is I went to the home ROM 1.13 because I wasnt sure if the original 1.0 did this.

Good luck

#3 10 days ago

With the balls removed, raise the playfield all the way (leaning on head) and power up. If coil doesn't fire, inspect the coil brackets for small burn marks. I believe that bracket is mounted to the right playfield hanger, which is grounded when the playfield is lowered. May be jumping a spark when coils first get power. If you see burn marks, remove coil and wrap brackets with electrical tape.

#4 10 days ago
Quoted from phishrace:

With the balls removed, raise the playfield all the way (leaning on head) and power up. If coil doesn't fire, inspect the coil brackets for small burn marks. I believe that bracket is mounted to the right playfield hanger, which is grounded when the playfield is lowered. May be jumping a spark when coils first get power. If you see burn marks, remove coil and wrap brackets with electrical tape.

Thanks for the response. The coil still fires with the pf in the upright position. No burn marks on the coil brackets…

#5 10 days ago
Quoted from KJL:

I had this and replacing the game ROM fixed it.
However, I went through everything to figure it out including full restore to factory which was suggested to me first as well as verifiying the trough and shooter lane switches were all good and the coil wasnt shorted. But like you mine always fired twice.
Mine came off route and always did this. It sounds like yours has also done this as far as your know? Can you ask the owner you bought it from if it always did it?
Its been over 10 years so I dont remember if it always did it or sometimes did it. I think it always did it so yours could be different.
One thing is I went to the home ROM 1.13 because I wasnt sure if the original 1.0 did this.
Good luck

Thanks for the info. I can’t speak with the previous owner as the game was sold to me by a gentleman who had it wrapped up in a warehouse and had been storing it for the owner for years.
I did a factory reset, still having the issue. Will order a new ROM now and hope for the best. I’ll report my findings.

#6 10 days ago

Try reversing the ribbon cable between the CPU and driver board. Same size on both ends, so just flip it over and see if that changes anything.

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