So, after determining that the power-up issue with the Defender system at Palm Springs Midmod was a minor issue with the back panel service power cut-off switch, restoring power revealed that the persistent memory of the unit was not working properly. This is almost invariably an issue with the battery that...

And Defender makes three! That’s right, 3 out of 4 game systems at our Palm Springs Midmod property were DOI (dead on inspection)! I knew about Frogger after a guest had lamented that the game system, one of her favorites, worked for only a day during their stay, but having both Defender and Tempest...

About 6 years after I bought them, I finally got around to installing Lithium battery upgrade kits into my Joust and Defender systems. Most Williams systems of this era were equipped with a 3 pile AA battery pack to maintain system configuration setting and the high score table. The issues with this...

My Williams Defender system is currently displaying it’s video image as follows: Jonathan at Arcade Repair Tips seems to think it is a board issue and suggested reading an article on MikesArcade website on general issues with Williams systems. He also suggested reaching out to Ken/YellowDog on the...