The Aussie Pinball Arcade

Aussie Pinball Forums => Technical Matters => Pinball Repairs / Problems & Assistance => Topic started by: Juventino on May 05, 2013, 07:28:00 PM

Title: williams flash switch matrix problem
Post by: Juventino on May 05, 2013, 07:28:00 PM

i have a williams flash pinball and started having problems with some of the switches. using the switch matrix i found that any switch in column 4 will trigger every switch in that row. all wiring looks fine diodes aswell does this mean its on the boards? btw mpu and driver boards are near new.

Title: Re: williams flash switch matrix problem
Post by: Homepin on May 05, 2013, 07:32:10 PM

Diodes can "look fine" but be dodgy.

I would replace them first. This machine is 30 years old and these diodes have copped a flogging vibration wise.