(Topic ID: 69156)

STTNG blowing f105


By Deadpool66

5 years ago



Topic Stats

  • 14 posts
  • 7 Pinsiders participating
  • Latest reply 5 years ago by Carl_694
  • Topic is favorited by 2 Pinsiders

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#3 5 years ago

F105 is responsible for coils 1-8. That's your left & right gun kickers, left & right gun poppers, left popper, plunger, knocker, and kickback. Most of the time a bad coil or drive transistor is what would cause that fuse to blow.

The simplest way to see which coil is causing the issue is to replace the fuse, turn on the machine and go into the solenoid test. Test each coil 1 - 8 with the door to the head open so you can see the F105 and see which coil makes it blow. From there you can test the coil and transistor with a meter or just replace both if you don't have one.

Those are all AE 23-800 coils. The associated drive transistors are all Tip36C on the driver board, numbers 64, 66, 68, 70, 76, 78, 80, 82. Get out your multi meter and go test those transistors. TURN OFF THE MACHINE TO TEST THESE. Put your meter to diode setting. Put the red lead on the big metal tab of the Tip36c and the black lead on each of the outside legs. You should get .4 to .6 volts on either leg. Put your black lead on the center leg now and you should get a 0 reading. Next put your black lead on the left leg and move your red lead to the center leg and again you should get .4 to .6 volts. Now keep the black lead on the left leg and move the red lead to the right leg and you should get .2 volts. If you get readings outside of those numbers, the transistor is bad and needs replacing.

Test the resistance of the 8 coils involved too. Put your meter on ohms setting and put the red on 1 lug and black on the other. You should get 5 - 15 ohms (some can go higher and lower). If you get under 3 ohms, that coil is a short and you need to replace it.

#10 5 years ago

if you can describe exactly what happens when you say it goes wonky or haywire, that would help. But if it just blows only when the Borg ship lights, I'd take the ship off and check the flashers and coil inside. Maybe a wire is off and shorting against something. Could put it in test mode and do the coil test and test only the Borg Kicker and also put it in flasher test and see if either of those cause the fuse to blow.

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