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Author Topic: Horizontal Scratches on both side of Perforation Peter John Anthony. C Film Handler Posts: 55 From: India Registered: Jun 2004 posted 11-24-2007 09:04 AM                     Hi!! Required your advice, since 2 weeks i am facing this problem in all print. After 4 to 5 days of print run i can see Horizontal scratches which starts from outer edge of film through the perforation toward the image area about 1.5mm. Due to this problem D.Digital fails, when sound reverts to SR we hear hissing sound. We have strong projection system which is 6 years old... Projector Head--- Simplex,Sound Head 5-Star, Strong Platter & Make Up Table... Awaited for your valuable advice to rectify the same. Regards, Peter.  |  IP: Logged Richard Fowler Film God Posts: 2392 From: Ft. Lauderdale, FL, USA Registered: Jun 2001 posted 11-24-2007 11:47 AM                     Pressure bands in the picture gate may need to be adjusted or replaced.  |  IP: Logged Ron Funderburg Jedi Master Film Handler Posts: 814 From: Chickasha, Oklahoma, USA Registered: Nov 2007 posted 11-24-2007 12:05 PM                        Are the scratches horizontal straight across or lateral at an angle across the film? Straight across indicates scratching that it is occurring in the gate while film is at rest and lateral is when the film is traveling. Most common place for this to happen is going on to the platter! Ron  |  IP: Logged Bernie Anderson Jr Master Film Handler Posts: 435 From: Woodbridge, New Jersey Registered: Apr 2000 posted 11-24-2007 06:40 PM                        I've never heard of horizontal scratches coming from the gate. How so? Its rare to see perfectly horizontal scratches, I've seen them but not often.  |  IP: Logged Ron Funderburg Jedi Master Film Handler Posts: 814 From: Chickasha, Oklahoma, USA Registered: Nov 2007 posted 11-24-2007 08:15 PM                        Bernie, I agree it is rare and I have no idea if it is happening in the gate or elsewhere but the gate is the only place you don't have continuous movement so it would seem to me it would be the only place that a perfectly horizontal scratch could happen. I have one theater that was doing some always at the end of the movies not all the way though we took the gate off and cleaned it good and haven't had them sense. I still can't see how film not moving can get scratched and if the film is moving it would seem to me that it either has to be lateral or vertical. Lateral is almost always on the platter usually from people running the film with sound track pointing down. Ron  |  IP: Logged Bernie Anderson Jr Master Film Handler Posts: 435 From: Woodbridge, New Jersey Registered: Apr 2000 posted 11-24-2007 11:17 PM                        I've seen horizontal scratches happen in XLs when the bottom loop is too big and hits the back of the projector housing. I usually get it when people are training. That XL loop has to be right on the money.  |  IP: Logged Scott Christopher Film Handler Posts: 69 From: Adelaide, South Australia Registered: Apr 2001 posted 11-25-2007 03:44 AM                     Check the film height where it returns to the platter.  |  IP: Logged Chris Slycord Film God Posts: 2986 From: 퍼항시, 경상푹도, South Korea Registered: Mar 2007 posted 11-25-2007 04:06 AM                     Platter would be my guess as well. At least on the strong platters I'm using, when the film comes off the last roller onto the platter it starts out almost perfectly flat where if the roller were too low both perforated sides would hit the surface of the platter.  |  IP: Logged Cameron Glendinning Jedi Master Film Handler Posts: 845 From: West Ryde, Sydney, NSW Australia Registered: Dec 2005 posted 11-25-2007 04:02 PM                     quote: Peter John Anthony. C sound reverts to SR we hear hissing sound. Does your projector need a red light reader? SR can sound almost as clean as digital in ideal conditions. Perhaps if you place some red gel over your white light exciter and raise the levels, you will decrease the amount of hiss, when it fall back to sr.  |  IP: Logged Richard May Phenomenal Film Handler Posts: 1057 From: Floral Park, NY USA Registered: Aug 2004 posted 11-25-2007 07:54 PM                     This problem drove me crazy for the longest time. Mainly because they were perfect horizontal scratches in a short area on both sides of the film. The problem happened only on simplex projectors. Both times the problem turned out to be the intermittent shoe on the bottom of the gate. There was enough play back and forth from the shoe that it would bounce from side to side and scratch the digital area and the optical soundtrack. Both times I replaced the shoe and it immediately stopped scratching.  |  IP: Logged Scott McGuire Film Handler Posts: 94 From: Elmira, NY/United States Registered: Oct 2007 posted 11-26-2007 12:34 AM                     We were having this problem a few months back and it turned out to be a loose roller on our platter. I think i found out to look for this somewhere in this forum can't remeber where thought.  |  IP: Logged Marin Zorica Jedi Master Film Handler Posts: 671 From: Biograd na Moru, Croatia Registered: May 2003 posted 11-26-2007 04:11 AM                     Yes I notticed this strange scracthes this summer. On start of projection in open air cinema where we use only analog I notticed some pop's in sound, but quite small, I was think some of speaker driver left...then I notticed straches from sound side of film thru center of picture.... This wasn't done by "us" it was done by cinemas which played film firts.  |  IP: Logged Peter John Anthony. C Film Handler Posts: 55 From: India Registered: Jun 2004 posted 11-26-2007 12:29 PM                     Thanks a ton for all the advice... The scratches seen on film edges are horizontal. We have changed all the Platter black roller... Now option to try are... 1) Gate alingment. 2) Will replace Pressure band. 3) will replace the Shoe pad. Will update the same once done the above, mean time more helps are awaited... Thanks, peter  |  IP: Logged

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