Only getting 2.5v AC to coin door bulbs

66GTO

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Need some help on where to start with my otherwise working Pole Position. It's getting 2.5 v AC at the coin door bulb sockets, and the 161 bulbs are very dim. Assuming it should be closer to 12v? What would cause this?
 
Need some help on where to start with my otherwise working Pole Position. It's getting 2.5 v AC at the coin door bulb sockets, and the 161 bulbs are very dim. Assuming it should be closer to 12v? What would cause this?


The door bulbs are powered by 6.3VAC from the brick, and you need 6.3V 555 bulbs as a result. It sounds like you have the wrong bulbs, if they actually are 161's.
 
Ok I'll get some ordered. What would cause the low voltage reading?

Power supply was rebuilt, new fuse block, new big blues, but original rectifier.

I'm assuming the ARIIs don't factor in on this, is that correct?
 
Are you measuring the voltage with or without the bulbs installed? An incorrect load will give wrong voltage readings, so start there. (And the voltage is not going to be 6.3V anyway, as it's unregulated, so it's going to vary from brick to brick.)

And no, the bulb voltages come straight from the brick, and are not related to the AR voltages.
 
Just checked it again without bulb, it was 2v, then dropped further to near zero. I started poking around, unplugged and replugged the Molex that feeds the coin door and voila back to 5.7v! All I need is some new bulbs now.
Thanks!
 
Just checked it again without bulb, it was 2v, then dropped further to near zero. I started poking around, unplugged and replugged the Molex that feeds the coin door and voila back to 5.7v! All I need is some new bulbs now.
Thanks!

At a minimum, you need to carefully check out those connectors and repin or clean them thoroughly or it'll just happen again.
 
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