(Topic ID: 73880)

Tech: F-14 Flasher circuit 04C is out

By burningman

5 years ago

Topic Stats

  • 5 posts
  • 4 Pinsiders participating
  • Latest reply 5 years ago by boogies
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#1 5 years ago

Hey Guys...worked on the F-14 for a while this weekend and noticed that one of the Red Flashers in the row on the back of the playfield was out as well as one on the right side of the playfield. Looking at the manual these two flasher are on the 04C circuit. Bulbs are good. Is this a resistor issue?

Noticed Marco has the entire board for $20.00...

Do you think this would be the solution?

#2 5 years ago

That could be the problem.

Most flash bulbs on the F14 share the solenoid output with another function (check the manual) so if the other function works in solenoid test, you know the driver circuit is working.

Each flash bulb has 2 resistors on one of these boards. The 330 ohm (physically smaller resistor) is the warming resistor and the 5 ohm is the current limiting resistor. A bad 330 ohm will not prevent the bulb from firing (it will cause the bulb to not last very long and not to flash as bright), a bad 5 ohm will prevent the bulb from flashing at all. You can test these with a ohm meter.

You can get replacement resistors from the regular sources (Digikey, Mouser, GPE, etc) for less than $1 each. No need to get the whole board unless yours are missing or burned.

#3 5 years ago

thanks schwaggs...going to look at her tonight

#4 5 years ago

When I redid my F14 I went through all the resistor boards and re-soldered them. Many of them looked like they where close to having a bad connection. Best to remove the old solder and add some fresh, also if you have a small steel brush it wouldn't hurt to clean the resistor legs up as well as they would be heavily oxidized before you re-solder. If no wire brush you can use a blade of a box knife or similar to 'scrape' the oxidation off or remove the resistor from the board and clean with steel wool.

#5 5 years ago

FWIW: They took out 2 flasher from the production F-14's - Not sure if it's the same 2, but if it is, buying parts won't make it work.


IPDB quote:
"Later playfields in the run had their two flashers disabled and removed because bending targets caused electrical shorts which then damaged the switch matrix."


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