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Author Topic: Jax Lite cracking sound. Bernie Anderson Jr Master Film Handler Posts: 435 From: Woodbridge, New Jersey Registered: Apr 2000 posted 02-11-2010 03:05 PM                        Makes sense... Does that go for the exciter supply too? Right now, the supply is not only lighting the LED, but is powering the preamp. The preamp has one leg grounded to the chassis of the soundhead. Should the preamp be powered by another source? or does that not interferre because it DC at that point?  |  IP: Logged Bernie Anderson Jr Master Film Handler Posts: 435 From: Woodbridge, New Jersey Registered: Apr 2000 posted 02-17-2010 05:52 PM                        So just to give you an update. I installed the wiring per your suggestions (treating the cell as an extention of the processor). I eliminated the pop on the curtain open/close, but I still have a pop on any automation function or Changeover open/close. I even hear a little tiny pop on sound format changes too. How much does the quality of wire matter? I'm using the crap from Radio Shack but am planning on changing it out to a Belden wire.  |  IP: Logged Demetris Thoupis Phenomenal Film Handler Posts: 1240 From: Aradippou, Larnaca, Cyprus Registered: Apr 2001 posted 02-18-2010 02:53 AM                     I think you should try bringing an electrician to check for proper grounding between rack & power and also between projector & power. From there on, make sure you connect a wire between the power ground at the chasi of both the projector and the soundhead. Loose ground between the two can give you a lot of static pops. Also I would suggest changing the power supplies for both LED and pre-amp to DC (separate power supplies for each) and tie the - leg to the chassi ground on both situations. Actually is redoing the installation or rather power distribution all over again. AC power is a killing factor. Demetris  |  IP: Logged Sean McKinnon Phenomenal Film Handler Posts: 1712 From: Peabody Massachusetts Registered: Sep 2000 posted 02-18-2010 12:31 PM                        you should see if it is possible to isolate the pre-amp on a completely seperate A/C circuit from anything else.  |  IP: Logged Bernie Anderson Jr Master Film Handler Posts: 435 From: Woodbridge, New Jersey Registered: Apr 2000 posted 02-18-2010 01:07 PM                        The preamp actually taps off the DC exciter supply. So it goes to the LED and the preamp. Now, I hooked up the standard exciter lamp yesterday and just jumpered the terminals to make it work. First, I can't believe how much I had to drop down the input compared to the Jaxlite when I ran Dolby Tone. Also, the line was so quiet, it was night and day. I opened up that particular preamp and discovered that it has been altered. I'm assuming that's half the problem. I'm working on getting another preamp. I do have a scanner and LED from a Component Engineering ASR 40. I'm missing the mount for the LED and a collar for the scanner to fit into the RCA. Also I would need a power supply. I'm not sure if its cheaper to buy a complete used Reverse Scan or find the extra parts needed to make it work. But I want to thank everyone for their suggestions. Although, its not perfect, buts 150% better.  |  IP: Logged

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