my profile | my password | search | faq & rules | forum home

» Film-Tech Forum ARCHIVE   » Operations   » Film Handlers' Forum   » damaged Dolby Digital - Cinemeccanica

Author Topic: damaged Dolby Digital - Cinemeccanica Antonio Marcheselli Phenomenal Film Handler Posts: 1260 From: Florence, Italy Registered: Mar 2000 posted 06-28-2003 07:17 AM                        HI everyone I need your help... Here is the story from the beginning. When I worked in my one-screen theater I always had a problem: my two V5 (auto rewind) scratched the DD data in a strange way, as in the picture. It was not a continuous scratch, I was not able to solve the problem but just minimize it adjusting all the rollers. At that time I thought that there were something on that projector too old (gate, sprockets) because the projs were 8 years old. Now I'm working in a new multiplex with all new V5 and I'm facing again the same problem. Before this new job I was at a 16plex with V5 but with curved gate and the problem wasn't there. So I suppose that the gate IS the problem. We clean them perfectly every day, the tension is at minimum setting. WHAT can I do? I have serveral print damaged... Please note that on some prints the scrath is almost on all the surface of the DD square, on others there is just a little scratch in the bottom (like first perforation in the picture) like there is something attempting to strach the print... I appreciate your help... Bye Antonio  |  IP: Logged John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 06-28-2003 08:14 AM                        "Intermittent" scratches outside the picture area like that are often caused in the gate, or by the intermittent shoe. In this case, look for a burr or rough spot in those areas on any surface that touches the emulsion side. It's unlikely that type of scratch happened anywhere the film is moving continuously.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 06-28-2003 10:23 AM                     Antonio, The best cure is to tell your boss that you need a new Kinoton Head!!! Those WON"T scratch the film...... Mark  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 06-28-2003 12:13 PM                     It is odd that it appears leading out of each perf After the first pass of the print is there a single mark only by one perf per frame? If so check the roller on the intermitent pad If it is on every one then I would check the rail of the trap or the edge of the apperture plate carriage also spotlessly clean the machine as that type of damage will defintely leave a telltale depsoit behind Also check the large roller leading down to the sould head for a flat spot Also you may want to use a strobe light to see if a small loop is forming below the trap between it and the intermitent and that the film is beating the lower edge of the rail never seen that mark before the Vic5's usually are a very robust and gentel projector.  |  IP: Logged Antonio Marcheselli Phenomenal Film Handler Posts: 1260 From: Florence, Italy Registered: Mar 2000 posted 06-29-2003 05:53 AM                        quote: Also you may want to use a strobe light to see if a small loop is forming below the trap between it and the intermitent and that the film is beating the lower edge of the rail Gordon, what do you mean? Bye Antonio  |  IP: Logged Richard Fowler Film God Posts: 2392 From: Ft. Lauderdale, FL, USA Registered: Jun 2001 posted 06-29-2003 06:38 AM                     Since you have the forward / reverse machine which has probably originally set up for acetate film, it may be more unkind to the more thin estar / mylar stock. The intermittent pad roller and upper rollers above the gate can be the source of problems. A part of the gate which may not be touched while in forward operation maybe touching the film during reverse. the stobe light would help you to freeze the image of the sprockets and other areas to locate the damage while the machine is in motion.  |  IP: Logged Antonio Marcheselli Phenomenal Film Handler Posts: 1260 From: Florence, Italy Registered: Mar 2000 posted 06-30-2003 06:20 AM                        Richard, I had two forward-reverse machine. Now I'm using normal V5. Interesting thing the strobe light tecnique... I never seen/used it. Bye A  |  IP: Logged Larry Zuverink Film Handler Posts: 98 From: Caledonia, MI, USA Registered: Nov 2002 posted 06-30-2003 01:10 PM                     Antonio, Cinemeccanica's are very rough on SRD. I don't know Italy's number but you can give Samuel Hynds a call in the US office at 626.939.0811. He is really good and has helped me find some strange problems.  |  IP: Logged Dave Macaulay Film God Posts: 2321 From: Toronto, Canada Registered: Apr 2001 posted 06-30-2003 10:23 PM                     The strobe is a great tool for seeing what's really happening in the running projector. You need one with adjustable and stable flash speed. A "party" strobe will probably not be stable enough for this but worth a try. Once you synchronize the flashes to the frame rate, the machinery appears to be stationary. adjusting so the speed is slightly different makes the movement appear in slow motion, and you can see exactly what the film is doing (and hitting) as it gets jerked through. Just remember that everything is actually still turning! There is a great temptation to stick your finger in to feel something because it really looks like it's not moving.  |  IP: Logged Philippe Laude Film Handler Posts: 79 From: Longueville, Belgium Registered: Jul 99 posted 07-01-2003 03:45 AM                     Mark, ANY poorly maintained projector will damage prints! Philippe Laude  |  IP: Logged Antonio Marcheselli Phenomenal Film Handler Posts: 1260 From: Florence, Italy Registered: Mar 2000 posted 07-01-2003 04:53 AM                        Philippe My projectors are nor poorly maintained!! Bye A  |  IP: Logged John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 07-02-2003 10:43 AM                        Strobes for motion analysis: Reliability Direct Electrical Contractor Test Equipment and Tools Homemade Strobe Mod LED Strobe  |  IP: Logged Carl Martin Phenomenal Film Handler Posts: 1424 From: Oakland, CA, USA Registered: Feb 2002 posted 08-05-2003 01:58 PM                        just the other night i played a print with similar abrasions. it looked like every 3rd-5th data block was scratched (in the few places i stopped to check while winding, after noticing the problem). i didn't notice any sound problem until the last 2 reels, when there were some of those clicking block repeats mentioned in another thread. i could only play it once, or i would have verified in the booth that it wasn't actually dropping out. carl  |  IP: Logged

All times are Central (GMT -6:00)

Printer-friendly view of this topic

Hop To: Select a Forum: Category: Operations -------------------- Digital Cinema Forum Film Handlers' Forum Large Format Forum Ground Level Feature Info, Trailer Attachments & REAL Credit Offsets Category: Community -------------------- Film-Yak Film Handlers' Movie Reviews The Afterlife Bob Maar's Joke-A-Thon Category: Classified -------------------- Equipment and Supplies Wanted/For Sale Help Wanted/Seeking Employment Category: System -------------------- Software Beta Testing Forum

The Film-Tech Forums are designed for various members related to the cinema industry to express their opinions, viewpoints and testimonials on various products, services and events based upon speculation, personal knowledge and factual information through use, therefore all views represented here allow no liability upon the publishers of this web site and the owners of said views assume no liability for any ill will resulting from these postings. The posts made here are for educational as well as entertainment purposes and as such anyone viewing this portion of the website must accept these views as statements of the author of that opinion and agrees to release the authors from any and all liability.