Hi
I refer to the picture and the snippet of schema (post-1 and post-2): https://pinside.com/pinball/forum/topic/williams-jubilee-gi-lamp-fuse-pops-on-start-up -

Lets assume I want to work on the "power-side" of a Williams pin like the "Jubilee". I toggle-off the main power switch - with one hand or with both hands I grab the 24 VAC fuse - accidentally I touch the fuseholder of the 110 VAC main power line --- what happens ?
110 VAC may flow through my body to earth / 110 VAC may flow through one hand, arm, body, arm, hand --- definitely "NO good".
Look in the picture - encircled red is the 24 VAC general purpose fuse (it is NOT the fuse for the bridge rectifier) - and JUST below is the 110 VAC-10-Amp fuse.

Look at the snippet of schema (110 VAC side, on top of the snippet) --- FIRST is fuse - SECOND is main power toggle-switch. You can toggle-off --- BUT the fuseholder / fuse HAS POWER.

So when I work on a pin: I ONLY plug-in the main power-chord when I NEED power for to do some tests. Greetings Rolf

Hi
I show a snippet of schema made from: https://pinside.com/pinball/forum/topic/1963-williams-beat-the-clock-repairs#post-3192582 - in that topic I suggested: Mount a new Line-Power-Toggle-Switch BEFORE the fuse. Mount it encapsulated / covered - here I add "put a paper tag at the switch telling: ALWAYS LINE-CURRENT".

These early-1960ies pins ARE dangerous - Line-Current "at hand" all around - everywhere. Greetings Rolf

aSafety-snippet_(resized).jpg