Williams Firepower having a problem(s). The right inner lane, right outer lane, 3 of the top 4 lanes and the 3 "power targets" on right side mid-playfield are not activating when rolled over/hit. Two original boards (see diagram), the CPU & Driver boards were replaced with a new Rottendog board (see photo) which has been in the machine for almost a year, working flawlessly until now. It was installed for me by a competent tech. Dip switches are all in the proper setting. The switches that are not functioning are # 01, 03, 04, 05, 09, 26, 28, 29, 30, 31, 34 and 39.

I re-seated both connectors on right side of Rottendog board & tested. Still has same issues. Any suggestions or ideas of what is causing the problem & potential fixes? Thank you.

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Thanks for the quick post guys. The connectors are molex type, will have to inspect those very closely. What puzzles me is that the board has been in place for almost a year & all was working well. Could the female ends experience problems after so long a time? I guess anything is possible.

yep, good point m. I've never re-pinned connectors but I guess there is a first time for everything.

Cool, thanks for the advice. Will check out the tutorial.

My sincere apologies guys....I have been using the wrong reference document for the switch #s that are presenting a problem. Refer to the diagram below, which is the correct diagram. The switches that are not functioning are: #33, 34, 35, 36, 37, 38, 39, 40, 41, 43, 44, 48. Answering erichill question: swithc # 25 (bottom left pop bumper) and #32 ("F" rollover) are working. Sorry for mixing things up, am pretty much a novice at this. Thanks everyone for you help!

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thanks terryb. Now that I have a better idea of what to go look at I will check those wires/connectors much more closely.

I replaced the U17 integrated circuit (which on the Rottendog board replaced IC17 and IC19) on Firepower & it seemed to work initially. All the lanes/switches/targets were activating. Then, a series of odd things began to happen.
The lane change feature didn't work
On ball drain, bonus score registers...then it loads ball in plunger, but even though I had only pressed 1 player, when ball drained it moved to 2nd player, and gave score just as the ball was loaded into the plunger...about 5,000 or 6,000...again, when ball drains it gave player 3 added score, etc.
And upon new ball being loaded in plunger, the upper right kick-out hole activates repeatedly, even tho there is no ball in the hole...it does that until you shoot the new ball out of the shooting lane and onto the playfield.
After further checking, now the inner & outer lanes to the right of the bottom sling do not activate.

Not sure where to go from here, but seems like the problem has gotten worse....

Guess I will go ahead and re-pin the molex connector 2J2....and, will keep my fingers crossed & hope for the best.

No terryb, haven't done any testing for continuity on the board itself. Not sure how to do that. Photo of board is in thread above. I'll post a photo of the back later today.

Update: replace IC #U17, and re-pinned both Molex connectors 2J2 and 2J3. While this did solve some of the issues, there are still two remaining. Game starts properly...but, when 1st ball is loaded from the out hole it rests on the ball shooter switch (# 46) which then activates the right eject (kick-out) hole which is switch #30 and adds some score incorrectly.

Also, when right flipper/lane change is activated (switch #45) it causes activation of left eject (kick-out) hole which is switch #13. This action also adds score incorrectly.

Am thinking this might be a board problem, since I closely inspected all impacted switches under play field & they all look fine. Am planning to contact Rottendog tech & see if they can walk me thru testing the MPU board.

Did a cross-connect test between posts on Rottendog board that connect to 2j2 and 2j3 connectors. Seems like there might be a problem on the board itself. Rottendon tech very helpful in guiding me thru that testing. Sent the board to Rottendog for further testing/fixing if necessary. Keeping my fingers crossed that the problem can be detected & resolved. Will update in a few days when I get board back.

another update: sent MPU board to Rottendog, and when returned installed it back into the Firepower. Good news is that the pin turned on, started a new game, played, scored properly & all switches worked! That was awesome. The only related problem now is that I can't get into the diagnostics in order to change the game settings. The old board had a switch marked "Diagnostic Start"...but, the Rottendog doesn't. Will continue reaching out to Rottendog to see if there is some kind of work-around, or if I need to go into "Master Command Settings" and set the dip switches to restore factory settings....don't really want to do this - am afraid something else might go wrong.

Anyone experience this problem - that is Williams System 3 not being able to go into "diagnostics" mode?? Thanks.

Last update: I believe all issues have been resolved. To get the diagnostics to start up again I re-seated the two connectors on the top left side of the board which provide connectivity to the coin door diagnostic buttons. Then I reset the diagnostics - there are two push-buttons (black, square shaped) towards the left side of Rottendog board, by pushing the "SW1 - Diagnostics" button the diagnostic buttons on the coin door activated! Able to run diagnostics now as well as changing game settings. Thanks all for the great help!!