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Author Topic: Basement Reader Analog problem Demetris Thoupis Phenomenal Film Handler Posts: 1240 From: Aradippou, Larnaca, Cyprus Registered: Apr 2001 posted 08-01-2004 11:52 AM                     How about this problem, I can not mention the brands of the projectors but we are talking about basement readers (reverse LEDS). The problem which is identical to all three screens is that when the film is in analog, the centre channel seems to be playing all in the surrounds and the surround in the centre channel. The input from the projector to the sound processors (all CP650 without EX) is coming in very low. I've tried the Jiffy test film and when the sound is supposed to be rotating clockwise from the left speaker to the surrounds, the rotation goes LEFT - SURROUNDS - RIGHT - CENTRE, meaning when the centre is supposed to be playing the surrounds are and vice versa. Could there be a problem with the wiring of the Basement reader? Any ideas? Thanks in advance. D  |  IP: Logged Stephen Furley Film God Posts: 3059 From: Coulsdon, Croydon, England Registered: May 2002 posted 08-01-2004 12:08 PM                     Sounds like either the Lt or Rt, but not both, inputs to the processor from the projector(s) has been connected with its polarity reversed.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 08-01-2004 12:08 PM                     Check to be sure that the plus and minus connections for each channel are correct at both the scanner and the processor. This is what happens if they get reversed. Mark @ CLACO  |  IP: Logged Manny Knowles "What are these things and WHY are they BLUE???" Posts: 4247 From: Bloomington, IN, USA Registered: Feb 2002 posted 08-01-2004 12:45 PM                     In any event, I would recommend A-Chain alignments for all of those systems.  |  IP: Logged Sam D. Chavez Film God Posts: 2153 From: Martinez, CA USA Registered: Aug 2003 posted 08-01-2004 02:11 PM                       Another great new picture, Manny. Assuming the analog did not always behave this way and once was normal, I would look into whether you have burnt out segments in the 2 x 12 LED arrays. This was quite common on IR LEDs. It also occurs very infrequently on Red Leds as well. The light should appear to be one continuos slit of light if you put a piece of paper in front of the LED. If it missing segments they are usually in the middle where the LED runs the hottest. Missing Leds play hell with the matrix and the result can be what you are describing.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 08-01-2004 03:37 PM                     Donno, I have replaced close to 20 red leds in the last 60 days. Of course they were in excess of 5 years old and had not been switched off. All had multiple failed segments. Most were in CAT 701's, others in Kelmar scanners. The good news is that I've saved them all and plan on making a RED LED hat to wear at next years Showest out of them. Mark  |  IP: Logged

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