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Author
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Topic: Orcon II ignition trouble
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Tim Reed
Better Projection Pays
![](/ubbmembers/137h.jpg)
Posts: 5246
From: Northampton, PA
Registered: Sep 1999
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posted 07-19-2007 11:03 AM
SOLUTION!
Turns out the meter showing 120 volts no-load was wrong. It wasn't even close. The key was that the autostrike stopped working about the time the problem started - indicating low no-load voltage. (Thanks, Dale McMillan!)
Since this place is in really bad shape, I ordered new almost everything and pretty much rebuilt the rectifier. First, I pulled the whole shooting match out of the console. If I'm gonna do something like this I'm gonna do it right, so I gotta be able to get to it!
I installed new filter caps and 100-watt resistor, cleaned-up the wiring, remade connections, etc. As I was in the midst of this work, I happened to notice that not only were the two filter caps missing a jumper between their positive posts, but they weren't picking up the positive heatsink IN ANY WAY! That particular terminal was tied-off lying free in the air.
Also, the tertiary winding to the lower pair of power diodes was not connected!
Aha! (Don't you just love those moments?) All the pieces fell together. The kid who was in there checking diodes the other day must have done this. I learned from the chief projectionist that this same fellow hadn't even tightened the diodes back in place - they were just hanging there (how dense or lazy do you have to be, not to at LEAST put things back the way you found them)! They'd had a legitimate problem (a fuse opened in the supply to the console), and this kid began checking diodes. Since replacing the fuse, they've had the ignition trouble.
Dale McMillan really helped with this, his memory was faultless - right down to the wire colors and which terminals they should be attached to!
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