Quoted from Zigzagzag:

So I was lucky enough to aquire 2 WWF games and sold one of them to a friend of mine.
They both work fine - except for the shaker.
On one of the machines the shaker is weak/doesn't really work.
So we set to work - during a long process we have changed all transistors in the path to the shaker (both on the CPU and on the driver board).
All voltages have been measured within tolerance.
All wiring has been bypassed and/or replaced.
We have tried 3 different CPU boards, 2 different driver boards and 2 different power boards (all from working games).
The CPU and driver board have been tested in the other machine and work fine.
The shaker board has been gone over and solder points reflowed.
No change.
The shaker board and shaker have been tested in other machines and worked fine.
The shaker works fine if the negative lead is grounded while the positive lead is connected to the shaker board.
The shaker works fine if transistor on CPU or transistor on driver board is grounded.
Does anyone have any clue to what this might be?

Quoted from mrwolfau:

Hi Guys, got a wwfrr and having some issues with the ball ejects. If I shoot a ball into the Mr Fuji ball trough it doesn't automatically shoot out and the game essentially stops. If I restart the game it still won't come out, but if I play a couple more balls it will then come out when it's at the end of the game. The kickers etc seem to be firing ok as it does eject the ball when the games over. Any ideas?