Film-Tech Forum ARCHIVE: Sound Problems

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Topic: Sound Problems

Tom Ferreira
Expert Film Handler

Posts: 203
From: Conway, NH, USA
Registered: Jun 99

posted 02-05-2000 11:11 PM

I'm running Cinemecannica V-9's in my booth, and I generally don't have any problems with them, and I should probably know the answer to this, but I'm lost on this one...
In one of my auditoriums, the sound is fine, except when music is playing on the soundtrack of the film. It sounds warbly and drags, almost like it's running a tad too slow. The oil in the sound head is OK, and the rollers that hold the film on the sound drum are lubricated. Any suggestions?

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Ken Layton
Phenomenal Film Handler

Posts: 1452
From: Olympia, Wash. USA
Registered: Sep 1999

posted 02-05-2000 11:38 PM

Check soundhead bearings.

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John Walsh
Film God

Posts: 2490
From: Connecticut, USA, Earth, Milky Way
Registered: Oct 1999

posted 02-06-2000 01:07 AM

On the V9's I used, there is no oil in the soundhead; it's just a flywheel. There is an oil 'dashpot' just after the sound drum. The dashpot has a spring and a screw adjustment. The screw is turned until the round base aligns with the point (while running with film.)

I'm assuming it worked OK before, and just started all of a sudden. Problems I've had (in rough order of likely-ness to cause wow.)

1. Worn or dirty rollers (part 009) or spindle. There were "old" 009's, and there are "new" 009's. The old ones are just one peice; the new ones look the same, but there is a pressed-in bushing in the hole for the spindle. Get the new ones if worn. That "lay-on" arm can be removed and cleaned out without messing up the optical aligment. Dirt get all over the the spindle, shaft, etc.

2. Spring (E-118a) broken or weak and not pressing down hard enough.

3. Rust in bearings. Happens even if you are good about oiling it. Remove 4 allen-cap screws (to get the sound drum assembly out) and free up. Means a new A chain aligment, though.

4. Wrong oil used in dashpot. (Did someone change it recently?) Yes, it does make a difference. I learned the hard way.

5. Flywheel cover bent/not on right/ or ground contact bent.

6. Peice of film caught in hollow area where solar cell is.

I worked with 4 V9's. One day, (when we just ran mono solar cells) another operator removed the outer drum "bellhousings" on two machines to clean them, and switch them when reinstalling.
Try the easy stuff first...

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Martin Frandsen
Master Film Handler

Posts: 270
From: Denmark, Europe
Registered: Jun 99

posted 02-06-2000 01:12 PM

It's the same sound-drum type that are on the V8 and V9's, the flywheel type.

I havent had any problems with my V8, i guess i dont use it that much

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