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(Topic ID: 107499)

F14 Tomcat diverters and slingshots stopped working


By koen12344

6 years ago



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  • 10 posts
  • 3 Pinsiders participating
  • Latest reply 6 years ago by koen12344
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#1 6 years ago

Hi guys,

I tracked down the problem with the Yagov kicker and upper targets not working on my F14. Transistor Q42 was indeed broken, so I replaced it, which fixed the problem.

Unfortunately, this spawned some solenoid problems. The diverters no longer work, and neither do the slingshots or pop bumper. I figured this could be related to the first problem, so I disconnected 1J8 and 1J10 and ran the solenoid test again. Problem was still there.

Did I break my CPU board?

#2 6 years ago

They shouldn't be related. Those solenoids share a single fuse, maybe that's blown or got knocked? It's the fuse underneath the top of the playfield, not far from the pop bumper.

See if that fuse is OK.

#3 6 years ago

Thanks, I will check that. Pretty weird that it happened right after repairing the CPU board (and always used to work before). Could there be a short with the switch circuit, causing the Q42 transistor to break in the first place?

I noticed the Q42 transistor had already been replaced before.

#4 6 years ago
Quoted from koen12344:

Could there be a short with the switch circuit, causing the Q42 transistor to break in the first place?

Q42 is a switch matrix driving transistor. I would run the switch tests thoroughly to check it. It could have just failed on it's own, but it seems you don't know the history of the game prior to your ownership. Typically, shorting the switch matrix to something will damage a lot more than just the driving transistor. Maybe (original owner) got lucky and lost the transistor, or they have replaced other parts, upstream PIA etc. It's worth thoroughly checking.

It's also worth checking for stuck on or machine gunning special solenoids, these directly control solenoids. Especially pop bumpers and slings, really common for those to get stuck on and take out the supply fuse, or the coil, and possibly driving transistor. Just remember that fuses usually blow for a reason. If you replace the fuse and it works, you'll still want to try to find out why that happened in the first place.

Another note - make sure the diverters are not binding. There is a service bulletin regarding this subject:
http://mirror2.ipdb.org/files/804/Williams_1987_F_14_Tomcat_Service_Bulletin_no_number_undated_to_resolve_binding_diverter_gate_assembly.pdf

#5 6 years ago

The regular switches all work fine now.

I've tested the fuses on the playfield (took them out and measured them), they both seem to be ok. I then tested if the special solenoids had any power to them, but they don't. There's also no power going to the fuse (should there be?).

#6 6 years ago
Quoted from koen12344:

The CPU controlled switches all work fine now.
I've tested the fuses on the playfield (took them out and measured them), they both seem to be ok. I then tested if the special solenoids had any power to them, but they don't. There's also no power going to the fuse (should there be?).

Well, if power isn't getting to the playfield fuse, that's not good. Check 3J3 on the power supply - pins 4 thru 8. I'm not at my game so I am just going by the interboards schematic in the manual. F2 on the power supply board is the solenoid fuse.

#7 6 years ago

I'm not near the machine either, so I will check it out later. If there's no power to the special solenoids, that means I can almost rule out a CPU board issue right?

#8 6 years ago

Well, I traced the diagrams, and realised my STUPID mistake

I installed a PinLED display, and the manual told me to remove fuse F1, and most likely another fuse (accompanied with a picture of F1 and F4 being removed).

I thought it all worked fine after installing the display, guess I didnt test it well enough I reinstalled fuse F4, and now all is working.

Thanks for the help though! I was losing my mind and thought i broke something on the CPU board. Sorry for wasting your time

#9 6 years ago
Quoted from koen12344:

Well, I traced the diagrams, and realised my STUPID mistake
I installed a PinLED display, and the manual told me to remove fuse F1, and most likely another fuse (accompanied with a picture of F1 and F4 being removed).
I thought it all worked fine after installing the display, guess I didnt test it well enough I reinstalled fuse F4, and now all is working.
Thanks for the help though! I was losing my mind and thought i broke something on the CPU board. Sorry for wasting your time

No problem. It's the mistakes that break things that really suck. Happy pinballin'

#10 6 years ago

Thanks! It's good to have it technically working 100% now. But I guess you could say the playfield still "needs some work"

WP_20141029_001.jpg

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