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This topic comprises 2 pages: 1 2
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Author
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Topic: Shutter Timing ?
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Randy Stankey
Film God
Posts: 6539
From: Erie, Pennsylvania
Registered: Jun 99
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posted 10-14-2002 03:44 PM
In the Christie Projector (Most other ones, too.) The shutter should spin OPPOSITE the direction the film is going... In other words, it will spin clockwise when viewed from the rear of the machine (Or counter-clockwise viewed from the front.)The easiest way to describe it in words would be to hook the belt under the bottom of the shutter pulley, then twist the part that's nearest you toward the front of the projector. OR... you could just look at this picture... 
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Monte L Fullmer
Film God
Posts: 8367
From: Nampa, Idaho, USA
Registered: Nov 2004
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posted 08-05-2010 02:08 AM
Gonna bump this 8 yr old topic up to the present day due to a search that I did, thus please forgive me:
I had to do a search on this topic that happened to me tonight on a Christie belt replacement and had problems like crazy until an almost major reinstall of parts finally cured the problem:
P35GPS - love these units. They don't have the swing-out motor mounts.
I can do a belt changeout in 15 minutes on these units without a hitch - including the pinch method that Brad mentions in this post on the shutter belt.
Tonight, while at the 14plex, I was doing some preventive maintenace while operating-which includes some belt changes.
Thus, got 4 machines done without a hitch until my 5th one and all hell broke loose.
Got the belts installed, hit the screen with the picture and horror was present on the screen: shutter streak oscillation-meaning it would be in time then horrible streaking would follow and then back in time.
Shut down the projector and rechecked my timing-which was totally way off. Thus, retimed the shutter, did the test and continued..and again streak oscillation.
Figured I had a defective double side belt. Replaced it with another one which proved negative-still had the problem.
(we had to cancel the show, but luckily, only 3 people in the house..)
By this time, the AST MGR came upstairs to see what is what. AST MGR called the company tech and was told to change out both the shutter driver and the jackshaft assemblies...along with the shutter.
Did the parts changeout and got the problem solved. I think that the shutter was defective and would not pinch down on the shaft very well.
Yes, I was flustered and embarrassed that of all the belt changes that I've done on these units that this was the first time I've experienced this kind of situation..and was politely recommended by the AST MGR to do belt changes before or after hours-not during operational hours.
*sigh* .. live and learn. - Monte
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