Another 4900 issue

jay

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I have a known tube and chassis that work. I moved the tube from cab to another.

I am missing either green or blue. (The screen looks yellow).

I swapped chassis with another known good one, same issue. Swapped pcb's also just in case.

The tube has been recently rejuved and worked before I moved it.

I will say, I had a hell of a time getting the tube out of the original game and it got bumped around pretty good.

Is it possible that I bumped the yoke out of place and that would cause what I'm seeing? I thought I was careful enough not to bump the yoke.

So I know:
It's not the chassis
Tube was just rejuved and looked great.
Not the pcb/game board.
Not the harness.

Thanks
 
Quickly shorting the neckboard pin ( or the collector of the drive transistor ) for the associated color gun to ground will produce a full screen of that color. No harm to the tube, just don't hold it for more than a second or two. This is kind of what a rejuvenator does using controlled voltages. If you get no flash I suspect bad tube.
 
Testing the tube is going to have to wait. I had a spare tube and used it for the game. Didn't want to use that tube initially due to heavy burn. At least I have 1 more working game :D.

Funny how you can do everything you can to make a tube and chassis work. Move it, and all kinds of shit happens.

The rejuv wasn't mine, I borrowed it. Will have to wait until I can get another and see what the deal is.
 
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