Anyone had a start prob like this?

[Mooseman]

Got a whitewater that won’t always start a game.
In freeplay no credit dot.
In switch test the start button works every time.
Changed start button anyway which also works in test all the time.
So today after a few games no start again
Turned it off and back on again and hey presto it’s playing ok.
Suggested possibly dodgy roms

Anyone else had similar problems? And fix.
CPU board looks fine and no batteries as nvram

Cheers

 

[drhex]

Does the start button still work in switch test when it doesn't start a game anymore? If so, does it work again when exiting the test?
Would be surprised if it was the ROMs

 

[Mooseman]

Not sure if I tried that. I just know it always works in test

 

[drhex]

Let us know, also test any other switches on column 1/row 3 to see if it is something in the switch matrix.

 

[Calimori]

Check Bigfoots head when you press the button, if he is facing the wrong way, he doesn't seem to let the game start on mine. Cleaning optos on his head helps.

 

[Mooseman]

Velly interrresting

 

[Calimori]

What I am saying is the button will test as working but the game won't start unless the other condition has been met.
He has to be looking like this on mine.

 

[Mooseman]

This is normal head position on mine from power on and game starts.

After he’s diverted the ball with log down whirlpool then he stays facing forwards and game won’t start. Just look at him grinning about it.

I’ve cleaned the optos with ipa and cotton bud.
In head test it does report an unknown
Maybe a bad opto
I will have to remove the board again and try with power on if they are switching

 

[Sgt GrizZ]

I recently had issue with Bigfoots head - erratic behaviour.

Turned out to be the C2 capacitor on the Bigfoot board . Had leaked its goop all under the chip just below it . Had to remove, clean it all up , fit socket and new chip and cap. Bigfoot all happy again

 

[Mooseman]

As Grizz says my bi directional board had previously blown the cap and had already been replaced but the corrosive gunk has slowly eaten through pin 1 on the chip. Could buy another chip and socket but thanks to @Dr. Pinball fine micro surgery soldering. A new leg extension has been added and big foot head is now spinning both directions. Can reset himself and games can be started.
Found these as well

Williams A-14768 A-15680 A-15782 Bi-Directional Motor PCB Pinball | eBay

These include the PCB, all necessary components, as well as a Parts List, PCB Layout, Schematic Diagram, and Instructions. The bare PCB is supplied without any components, but does include a Parts List, PCB Layout, and Schematic Diagram.

www.ebay.co.uk

Thanks for everyone’s support