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Author Topic: How do you determine when it is time to change a digital projector filter? Eric Robinson Jedi Master Film Handler Posts: 538 From: Santa Rosa, CA Registered: Jan 2005 posted 04-05-2011 01:27 PM                     I know there are guidelines in the manuals of digital projection equipment which provide a filter changing period; however, after perusing the forums here it seems evident that different locations require different intervals for filter changes. So to have the most effective filter changing process it would seem that inspecting the filters would be the best indicator of the filter changing frequency. What I'm wondering though specifically is what criteria indicates that a filter is due for change? Is there some way to quantify it other than common sense?  |  IP: Logged Paul Mayer Oh get out of it Melvin, before it pulls you under! Posts: 3836 From: Albuquerque, NM Registered: Feb 2000 posted 04-05-2011 01:29 PM                        On the Sony 320, the interval is set at 2500 hours. You'll get a yellow tail light indication when it is time to change the filters.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 04-05-2011 03:51 PM                     Most of the others use an "at every lamp change" as the criteria however the booth and how long the lamp/fans are operating greatly weigh into this. I just changed out a lamp in an NEC at 1500 hours and the filters were definitely ready for a change. In fact, I've yet to see a machine with 1500 hours + of projection time where the filters didn't look bad enough to warrant cleaning/changing. -Steve  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 04-05-2011 04:58 PM                     The lamphouse air filters on the NEC's are HEPA type filters and are supposed to be changed out with every lamp change, however that is NOT necessarily the case with all lamps. The electronics filters which are seperate are supposed to be checked at 2K hours and changed IF NEEDED. Of course the lamp house has far more volume of air moving through it than the electronics section does so the filters will clog much quicker. What I have found is that the filters will last the life of a longer life... say 1500 (warranty) hour digital lamp so if you are running a high output lamp that goes ~650 (warranty) hours you should get 2 lamp changes from a single pair of lamphouse filters. On the NEC there is a nice feature where if the lamphouse over heats due to insufficient air flow the lamp will simply shut off and you'll get an error on the side panel LCD display so you know... Strong is now selling the filters seperately as one will need more lamphouse filters than electronics filters. The fact that NEC filters the lamphouse air I feel is a big advantage as the lamphouse parts and rectifier will always stay clean as new... neither of the other manufacturers do it.  |  IP: Logged Eric Robinson Jedi Master Film Handler Posts: 538 From: Santa Rosa, CA Registered: Jan 2005 posted 04-06-2011 10:34 AM                     Thanks for the contributions. Good info so far,  |  IP: Logged

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