(Topic ID: 207119)

WPC error of switch F8

By Krank

1 year ago

Topic Stats

  • 5 posts
  • 4 Pinsiders participating
  • Latest reply 1 year ago by CadillacMusic
  • No one calls this topic a favorite


Linked Games

Topic Gallery

One image has been uploaded to this topic. (View topic image gallery).

F8 FT2.jpg

#1 1 year ago

Hey boys,

I have very popular problem on WPC games - Error of switch F8 on my CFTBL. I checked this forum and same problem have many others on Draculas, World Cups, etc. But nobody have a proper solution. Every advice is just like: try to clean optos, try to switch opto boards, try new fuse on Fliptronic board,...

Switch F8 is "upper left flipper", but on most games there is not any u.l. flipper so F8 means just left flipper. In switch test on these machines you never see "F8" shown. F8 is probably shown like switch F4 (left flipper opto board)

Its very often problem so dont tell me that nobody there dont know clean solution....?

Thanks a lot

#2 1 year ago

You can check that F8 does exist in your machine.
Go into switch test T.1, pull J905 from fliptronic board and short pin 5 with pin 6.

Does that trigger F8 in the switch test ?

If so, possible something wrong with flipperbutton-optoboard in cabinet.

F8 FT2.jpg

#3 1 year ago

Thanks, I will try...

#4 1 year ago

Okay, for the record, F8 is the Upper Left Flipper *opto*.

Even if the game does not have an upper left (or right) flipper, the OPTO should still work. When you press the flipper button in, both F4 (L Flipper opto) and F8 (UL Flipper Opto) should activate. (Or for the right flipper button, F2 & F6) Again, this should happen *regardless* of whether the game HAS an upper flipper.

However - there is some exceptions!
SOME games that do not use the upper flippers will have the upper flipper switches (EOS, Opto) wired into switches on the playfield. (For example, Cirqus Voltaire has the two upper EOS switches wired to the spinners.)

#5 1 year ago

It's usually something that happens when the plastic (or metal) arm of the flipper button opto gets slightly bent out of whack. The interrupters aren't clearing the one opto. Try adjusting the arm.


The F8 switch is activated when the opto on the little board stops being interrupted. That is to say, the standard state of the opto is the beam from one side not making it to the other. This is so if the opto fails, it doesn't make the game think the flipper button is stuck pressed. When you push the button, the little plastic bit gets moved up, and out of the way of the opto beam. Now the beam can make it from one side to the other, and it registers a button press.

Promoted items from the Pinside Marketplace
$ 47.00
Machine - For Sale
San Antonio, TX
$ 128.00
Playfield - Other
ModFather Pinball Mods
From: $ 20.00
Cabinet - Other
Rock Custom Pinball

Hey there! Got a moment?

Great to see you're enjoying Pinside! Did you know Pinside is able to run thanks to donations from our visitors? Please donate to Pinside, support the site and get anext to your username to show for it! Donate to Pinside