Re: my machines dim during game play???? why ????

>Fuse clips get hotter with current draw, reducing current available to
>other circuits (clips gets hotter=more resistance, circuit draws more
>current, other circuits don't get as much)

Not exactly right.....
Fuse clips have a resistance (high or low depending on their state) and
may get warm. Warm connections tend to increase resistance depending on
load. The resistance causes a voltage drop across it (the fuse clip).
Power is consumed across the resistance (where the heat comes from).
The current is 100% a function of V=IR, or Ohms law. The voltage drop
across a resistance will lower the voltage across other devices. Sort
of a voltage divider. Since the 6V circuits are seperate from the 24V
circuits inside the transformer most of the problems come from a
transformer that is poorly designed or has too little iron or copper.

>Since coils are essentially a short to ground they get the current over
>the lights. I'd check and maybe replace some fuse holders. (Can't hurt
>anyway as the old ones are probably loose anyway)

Not exactly right. The coils are a "short", or low impeadance until the
field builds up some back EMF which turns the coil into a larger
impeadance. The current draw of the coils is quite high for a few
cycles and then drops off quick, but will tax the transformer that is
converting 120Vac to 24Vac and 6.5Vac for the lamps. There is only so
much iron and copper in the transformer and the trade off is a slight
dim effect when coils fire.

Too much dimming (how much is too much?) could be a bad connection or
some other problem, but slight dimming is tyrpical in just about every
pinball game.

Kirb

.

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