Hula Defender
November 28, 2012 10:25 AM   Subscribe

Help me fix fluorescent light fixture noise in a Williams Defender!

My Defender has massively bad screen hula when the florescent light in the header is on and none when it's disabled (either by pulling the tube or ballast). Picture here.

I noted that the metal panel that it's mounted on was not connected to the cabinet ground strap, so I tried tying it in with alligator clips, but to no avail.

The machine is in fabulous condition with very few sketchy repairs and I'd like to keep it that way - installing a new light fixture is way down on my list of things I'd do to fix it.

Ideas? Would an old/failing ballast cause this? The light seems to come on pretty quickly at power up.
posted by plinth to Sports, Hobbies, & Recreation (4 answers total)
The ballast is an electromagnetic device and can cause this kind of interference. There might be a piece of shielding missing somewhere.
posted by kindall at 10:35 AM on November 28, 2012

I've never heard of "screen hula" - so the screen gets wavy or something? You could try asking in /r/cade
posted by exogenous at 11:08 AM on November 28, 2012

What is that starter doing wedged between the tube and the sheet metal?

I'm talking about that aluminum can with 2 pins coming out of the bottom of it,
one of which I can see in the photo, with a little blue lettering on it.

The pin I can see is unconnected, so that starter isn't doing anything good,
and could be contributing to the trouble you are having. The electric fields around
a fluorescent tube are harsh and weird. Pull that thing out of there, or explain
why you can't.

The ballast is probably grounded to the metal reflector through the power cord, so
don't add superfluous ground connnections with alligator clips.
posted by the Real Dan at 11:08 AM on November 28, 2012

I took the ballast out to test running with no light and left it that way until it's diagnosed.
posted by plinth at 11:24 AM on November 28, 2012

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