A few have broken off and I've had to pull out the
base with pliers. I'm not sure of the model number, but I'll check that on Monday. I don't know how to do a "full maintenance" and I believe that I'm the most knowledgable person the school has hired in at least the past 8 years or so. Is there a good
book or Youtube video I could watch and learn how to do it?
The lamp not coming out of the
socket seems to be a fairly sure sign it has partially welded in, I assume there is some carbon (black marks) or such.
I would certainly replace the
socket on these units.
I do not believe there is a video or anything (and I personally don't have any books that show this) showing how to do maintenance on THESE fixtures. They are indeed older. However perhaps someone else may be aware of something.
I however am familiar with all the fixtures I listed above, if at least a little.
At one
venue where I do the bulk of my work we do a maintenance cycle on every
fixture in the inventory once a year (in September, before the season starts).
I take them to the work bench backstage. Take them partway apart and use an air
compressor and dry rag to remove all dust and debris (amazing how much can accumulate), occasionally further cleaning is required, but rarely. The whole time I am keeping an eye for broken or worn parts. Critical components are checked (
socket, clamp, bolts, glass,
reflector, shutters, other moving parts). I take my multimeter to the electrical contacts to make sure everything is good.
Anything deemed needing attention is fixed.
The
fixture is put back together and its lamp put back in.
I
plug it in to make sure it is working, and "
bench focus" the
fixture (adjusting the lamp position in the
fixture for proper field and light output).
It is then sent back up to serve for another year.
You should be able to find a local tech who can show you what to do and how to do it.