(Topic ID: 213431)

F-14 Upper Diverter Solenoid Stuck On

By steve8091

6 years ago

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21 posts
8 Pinsiders participating
Latest reply 5 years ago by CaptNRetro
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F-14 Tomcat Williams, 1987

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I have an F-14 with roughly the same problem..the upper diverter is not firing..brand new Rottendog MPU, all new coils and diodes..everything else on the machine works perfectly. In switch test nothing is stuck on, coil test fires every solenoid except upper diverter.. if you start a game and play for a while, within a few minutes the 2.5 amp fuse blows in backbox, which stops all solenoids from firing. can not for the life of me figure out what's going on..need help please..thanks!

Quoted from statictrance:
If the coil is locking on (or melted and causing that fuse pop) there's a good chance that it's damaging your related transistor (believe that's Q77, mine was the lower and is Q79) and possibly further up into the new board. I would be checking the coil itself first, replace, and then verifying your board.

All the coils are brand new..the originals were melted..changed the transistor on the Rottendog as well..still nothing

Quoted from CaptNRetro:
All the coils are brand new..the originals were melted..changed the transistor on the Rottendog as well..still nothing

still can't pinpoint issue..any help?

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