I'd have to look at the manual again, but if you plugged that clock in wrong, there could be a possibility you sent 12V to the switch matrix and fried any/all 3 of the switch matrix ICs on the MPU.

Only times I ever got F115 and F116 errors were from a fried U20

Before, I start trying to tell you there is a problem on the boards in the backbox, let me review the schematics. It's been a long time since I had a TZ and I'm not sure what I have proposed may even be possible

First thing I would check is to make sure Fuses F115 and F116 are good.

Sorry for getting ahead of myself there

Check the fuses with a multimeter not with the naked eye(I dont think the fuses blew but doesnt hurt to check),Lm339 are mostly on the opto board under playfield.If i were you i would buy a brand new clock board they work better and less heat.Was the power on when working on the game?Always power off!! and see if your U20 IC is socketed on your cpu board.That will need to be changed out.If it is not socketed you need to send it out for repair and theirs a lot of pinsiders who will help.

Agree with jwo825 and pinmike to check fuses first. Then ensure that you actually have 12v on J116 and at the opto board. That error seems to pop up if the optos are out for some reason.

How do things look in the switch test? Is it just the optos out or are there other switch problems.

If I remember right, LM339s should be able to handle 12V without getting crispy (though my memory could be wrong). People typically fry then by send coil voltage through them. I wouldn't pull chips unless you rule out everything else first.

Here ya go.
Read up and follow the process...
http://www.pinwiki.com/wiki/index.php?title=Williams_WPC#Check_fuses_F114_and_F115_message
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

You must have plugged the clock connectors wrong,Switch test is your friend in this problem.See if the optos register

You are correct fitzpatricksrus 12v can be handled.

I agree that the fuse "looks" fine.
But you really should remove it and buzz it with your meter set to continuity.

Also measure DC voltage between the backbox ground braid and the 12VR test point.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

Since you're poking around with the switch test, is switch 24 closed? It's hardwired closed. If it's not then you probably have a board problem or a loose connector.

It doesnt sound like you have a multi meter - I would run out and grab one before you do anyhing else, they aren't expensive, and you are guaranteed to need it again after this.

Message on startup, F115, F116, J112 and Opto 12V error.
I have the same problem with mine DM.The problem was one of the the two connectors from the down-left of the Power Board.Check it and replace it-J116 or J118

If you have some short,check if you have these 12v on the Power board-check the test points that cares for this voltage

Nice one, it's a great feeling when you're back playing again