(Topic ID: 281515)

Fuse keeps blowing


By SVBpb2025

64 days ago



Topic Stats

  • 6 posts
  • 3 Pinsiders participating
  • Latest reply 63 days ago by SVBpb2025
  • No one calls this topic a favorite

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#1 64 days ago

Hi. I just joined PinSide after a friend told me about the site. I appreciate the service and help!

I have a 1993 Twilight Zone pinball. After I turn it on, everything starts to come up, the lights, etc like normal. And the front panel goes thru the test sequence but does not point out anything abnormal other than to check the flippers. Then, when I hit the start button, nothing else happens other than sometimes it may make a short sound... somewhat like a hi tone pitch. The normal music does not come on and the flippers do not work either.

I opened up the game and behind the back panel, I took my volt ohm meter and found one of the 250V fuses blown. It is located on the right lower quadrant and second one down. It looks like it is a 7amp. When I replaced it, and turned the machine back on, it seemed like it was going to come up all of the way but within a few seconds, I saw the same fuse blow again....

So, do you think there is a short somewhere? There are so many wires, that I just do not know where to look. Any suggestions are well appreciated.

#2 64 days ago

Start with Pinwiki - it will tell you what you need to do to start troubleshooting.

Do you have the schematics? That will help tell you what the blown fuse feeds - for example, lights, solenoids, etc. once that’s figured out, we can be of more help.

There’s also a TZ club that you should post in- there are likely some gems of information on there that will be of help.

#3 64 days ago

Thank you Bill

I found my old manual. I am not well versed on wiring schematics but what I found is the fuse (F112) that keeps blowing is on the Power Driver board and it is a 7amp fuse that says it is for the "Solenoid Secondary". From the schematic this fuse connects to a Bridge Rectifier (BR3) and is the circuit for the High & Low Solenoid circuit and the Special (General Purpose) Solenoid Circuit. Not sure what to do from here. Thank you... Steve

#4 64 days ago

Read up on checking bridge rectifiers and then check BR3. If that checks good on the meter, then check the wiring from the bridge to the solenoid cards. Also, if you can, find a 7 amp circuit breaker so you don't have to keep buying fuses during troubleshooting.

#5 64 days ago

Are you sure you are using a 7A, S.B.fuse?

#6 63 days ago

Thank you. I reseated all of the ribbon cables and put in another 7amp fuse and it is now working.

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