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Author
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Topic: Christie sound warble
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Randy Stankey
Film God
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Posts: 6539
From: Erie, Pennsylvania
Registered: Jun 99
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posted 08-21-2001 10:50 PM
I second Brad's motion on the bearings. In a lot of the Christie projectors in my neck of the woods there have been a rash of bad bearings causing all sorts of problems, including warble. Make sure you check the bearings in the lateral guide rollers. They love to "blow their guts" all over the place, leaving the rollers to wobble as they run. I have even had one freeze completly. Judging by your description of the "Q-Tip Trick" it sounds a lot like the "screwdriver trick" that people in one theatre were doing. Replacing the bearings was the solution. While you are at it, be sure to order yourself a whole "tube" of those bearings. You're probably going to find that, one by one, the bearings in the rest of your projectors are going to start taking a shit on you as well. Christie told us that we have to OIL those bearings regularly but, for the life of me, I can't imagine how the hell we are going to get people to start doing that when it's all we can do go get them to clean the projectors at the end of each night. (Let alone at the end of each SHOW!) BTW: I vote that Page 1 of the Christie projector manual should read: ATTENTION: THIS PROJECTOR MUST BE THOROUGHLY CLEANED AFTER EACH SHOWING OR ELSE IT WILL SPITE YOU IN ALL SORTS OF NASTY WAYS!
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Randy Stankey
Film God
![](/ubbmembers/64b.jpg)
Posts: 6539
From: Erie, Pennsylvania
Registered: Jun 99
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posted 08-21-2001 11:57 PM
Sometimes the bearings just feel like they are full of gravel. Other times they seem to literally explode. On one occasion the bearing was so badly "blown" that the roller wobbled visibly on the shaft. On another, it froze up completely and wouldn't turn at all.Basically just inspect them. If there are problems they might be appearent just by looking at them. Wiggle them (gently) and turn them back and forth. Sometimes they feel like they have "gravel" inside them or they get a hitch in them that causes them to "bump" as they spin. It's not hard to tell good bearings from bad... good ones spin smoothly... bad ones don't. If you have any doubts you can compare with a projector that's running right. Go to the "suspect" projector and inspect a bearing and give it a spin. Then go to the other one and do the same. Note any differecnes. It's not hard to tell the difference. You can replace the bearings on the guide rollers easily with regular tools if you are careful. The bearings on the sound drum shouldn't be touched unless you can do a complete A-Chain alignment afterward. OK, truth is you should probably A-Chain the machine any time you work anywhere near the sound head but IF you work carefully you can replace the rollers without it. The upgrade kit works pretty well. You should probably get it. Especially if you have a Dolby Digital basement reader. It's not THAT hard to install but you do have to almost completely disassemble things to do it. It's not for the faint of heart.
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